Features of the Dongfeng DF-244 all-wheel drive mini tractor

The modern design, completely updated at the beginning of 2017, shows the attitude of the factory to its products - European industrial designers made efforts to develop the corporate outlines of the tractor. The front and rear optics have been completely redesigned. Compared to the previous model range, the operator's space is significantly increased, as well as an enlarged seat. The rear flaps now cover the wheels almost completely.

The dashboard is now a real cockpit - comfortable and practical, contains five instruments:

Fuel level gauge Hour meter Oil pressure gauge Coolant temperature gauge Ammeter

The model name already gives you an idea of \u200b\u200bthe technical specifications. DF's manufacturer is Dongfeng, 24 hp, and the four at the end denotes all-wheel drive.

The brake is now separate, consists of two pedals. The floor of the tractor is covered with a non-slip rubber coating.

The changes also affected the hydraulic system. In the previous version of DF tractors, only one NSh pump was installed for the entire hydraulic system, and the oil for the power steering booster swayed from the rear axle (at subzero temperatures, the hydraulic pump did not cope with the work, since the oil was supplied thick, and sometimes the hydraulic booster failed because of this ). In the modern model, an additional pump and an additional oil tank are already installed in the basic configuration, which ensure the functioning of the power steering. It turns out that the hydraulic booster has its own hydraulic circuit. The hydraulic cylinder of the power steering is covered with a boot to prevent dirt from getting in (there was no boot before, and people installed it themselves using improvised means).

The tractor motor is a well-known three-cylinder KM385, has a manual pumping of fuel, a wet-type air filter, has established itself as a reliable undemanding unit. The engine's factory warranty is 12 months or 1000 hours.

The body parts are of very good quality, the painting is at the level of a good automobile. The DF-244 chassis is prepared for use with a factory FEL-25 and FEL-250KS front loader, as well as a factory BK-215 excavator unit.

dongfeng 244 three-point system

Attachment and PTO attachment system

Together with a Dongfeng tractor, our experts recommend using attachments from Polish, Chinese and Ukrainian manufacturers. Three-point attachment system for attachments (class 1), and power take-off shaft 540/720 rpm. give endless possibilities in performing various agricultural works.

In addition to being used in the agricultural sector, the Dongfeng DF-240 mini tractor is used in the livestock industry, utilities, and logging. The reliability of the tractor is not satisfactory. Dongfeng uses quality components that are tested prior to assembly. As a result, the equipment is able to operate without failures for a long time.

As standard, you get front ballast - 4 blocks of 20 kg. Rear wheels are supplied without weights, but they are not required for most jobs on this tractor.

Gardenshop is the official partner of the Changzhou Dongfeng Agricultural Machinery Group, our service technicians are trained annually by DONGFENG representatives, and the managers are always aware of all the intricacies of the correct operation of the tractor in a variety of conditions. Thanks to close cooperation for almost ten years , we are ready to provide the best price conditions in Russia!

In terms of price / quality ratio, the Dongfeng DF-244 model with two hydraulic outlets is the optimal solution for a private farm or a municipal organization.

Dongfeng DF-244 tractor

Country of origin: China

Build country: China / Russia

Overall dimensions, mm: Length 3184 | Width 1350 | Height to handlebar 1460 | Muffler height 1950

Ground clearance, mm: 330

Structural weight, without attachments, kg: 1300

Rear Wheel Size: 11.20 "- 24"

Front wheel size: 6.00 '' - 16 '

Track, mm: 1400

PTO type and speed: Non-autonomous 6-slot Ø35 with rectangular splines, 540/720 rpm.

Engine driven: Direct engine to gearbox connection via clutch

Transmission type: Mechanical

Number of gears: (4 forward + 1 reverse) x 2 Differential lock:

Rear axle differential lock

Wheel formula: 4WD four-wheel drive

Power Steering (Power Steering): Fully hydraulic steering gear with separate hydraulic circuit

Rear linkage type: Category 1 three-point linkage | lifting capacity 420 kg

Brake type: Sealed disc brake, separate for each wheel

Clutch type: Dry, single plate, single stage, constant mesh

Hydraulic distributor: Standard distributor for three-point suspension

Number of additional hydraulic outlets: 2 pairs of hydraulic outlets

Light system: High and low beam | Turn Signals | Marker Lights | Stop signal | Rear suspension light

Sound signal: Klaxon

Dashboard: Voltmeter | Coolant temperature sensor | Oil pressure switch | Hour meter

Minimum turning radius, cm: 270

Trailer hitch availability: Mechanical hitch and electrical outlet

Standard weights: Front ballast, 4 blocks of 20 kg

Section VI. Lubrication and maintenance of the tractor.
6.1. Oils and lubricants used for tractor operation
6.1.1. Fuel oil and tractor grease.

Location	Oil category	Standard No.	Notes
Fuel tank	No. 10 # Light diesel fuel. Over 8 ° C	GB252-2000
	No. O # Light diesel fuel. 8 ° C ~ 4 ° C
	No. -10 * Light diesel fuel. ° C ~ -5 ° C
	No. -20 # Light diesel fuel. -5 ° C ~ -14 ° C
	No. -35 * Light diesel fuel. -14 ° C ~ -29 ° C
Gearbox, rear axle, front drive axle, hydraulic system		GB443-1989	SAE85W
Clutch release bearing.	No. 2 lithium grease	GB73245-1994
Other connection pipes of the solidification blowers.	No. 3 calcium based grease	GB491-1987	At any atmospheric temperature
Oil sump Air pump	HCA-14 Diesel Lube Oil (SAE40)	GB11122-1997	Summer
	HCA-11 diesel lubricating oil (SAE30)		In winter
Steering gear (2WD)	No. 2 lithium grease	GB73245-1994	At any atmospheric temperature
Steering gear (4WD)	N100 drive and hydraulic dual oil	GB443-1989	At any atmospheric temperature

6.1.2. Grease locations.

Oil supply.

Engine (please refer to engine manual)

1 on the top cover of the rear axle housing.

1 on the crankshaft of the air pump.

1 on the left and right front axle clutch.

Solid injector nozzles:

Engine water pump bearings:

2 on the left and right tie rods.

1 at the top connection.

2 on the screw ties of the left and right safety chains.

2 on the front and rear track rod teeth.

2 on the left and right steering tie rod teeth.

2 on the left and right front wheel hubs.

2 on the left and right steering levers.

1 on the coupling spindle (for 2-wheel drives only).

2 on the rear air suspension roll-in support (for four-wheel drives only)

2 on the right and left steering levers.

1 on the clutch shaft.

1 on the brake control shaft.

Oil level monitoring equipment:

Engine oil dipstick.

Oil dipstick on the left side of the front drive axle.

Oil level plug on the side cover of the air pump.

Oil drain plugs:

The bottom of the engine pan.

Left underside of gearbox.

Lower rear side of the rear axle room.

The bottom of the air pump.

The bottom of the oil tank.

The bottom of the front-wheel drive room.

The bottom of the transfer case housing.

6.2. Maintenance of the tractor.

6.2.1. Maintenance of each switch.

A. Engine.

• 
  Ensure the proper level of lubricating oil in the engine and monitor the oil level between the middle and upper clearances on the dipstick. Oil level outside the upper gap is prohibited. New engines or those that have been out of operation for a long time should run for 5 to 10 minutes at low speed, then check the oil level and top up if necessary.
• 
  Fill the water and fuel tanks with sufficient cooling water and diesel fuel respectively.

B. Chassis.

• 
  Check and fill in all external bolts and nuts.
• 
  Apply grease to the following locations: left and right front wheel bushings, left and right steering link teeth, left and right front drive axle steering arms, and engine water pump bearing.
• 
  Eliminate oil, water or air leakage, clean external surface from dirt.
• 
  Check tire pressure, pump up if necessary.

6.2.2. Maintenance after 50 hours of operation.

A. Engine.

After 50 hours of light running in, the lubricating oil of the new engine must be completely changed, including the lubricating oil in the sump and the fuel injection pump. Change the oil filter element. Clean the sump and oil filter with clean diesel fuel.

B. Drive system.

After the tractor has operated for 50 hours, check the free travel of the clutch pedal and adjust if necessary.

B. Battery.

Check the electrolyte level, top up with distilled water if necessary.

D. Lubricate the injectors with a grease gun.

6.2.3. Maintenance after 100 hours of operation.

A. Engine.

• 
  Change the oil in the oil pan and clean the filter.
• 
  Change the engine oil and filter elements; clean the filter cavity.
• 
  check the fan belt tension, adjust if necessary.
• 
  Check the oil level of the fuel injection pump, add oil if necessary.
• 
  Clean the air filter and change the lubricating oil (if working in a dusty area, carry out this process after each shift)

B. Clutch.

• 
  Check the free travel of the clutch pedal, adjust if necessary.

6.2.4. Maintenance after 250 hours of operation.

• 
  Drive system.

Check the oil level in the rear axle, add oil if necessary.

• 
  Front axle.

Check the front wheel bearing clearance, make adjustments.

• 
  Battery.

If necessary, add a little petroleum jelly to the battery terminal.

6.2.5. Maintenance after 500 hours of operation.

• 
  Check open pressure and injector automation, flush and clean, and make adjustments if necessary.
• 
  Check and tighten the cylinder head nuts, adjust valve clearance if necessary.
• 
  Clean the water pipes in the cooling system.
• 
  Change the lubricating oil in the fuel injection pump.

6.2.6. Maintenance after 1000 hours of operation.

A. Engine.

• 
  Check the air tightness of the valves, if necessary, perform lapping in them.
• 
  Check the injection advance level, adjust if necessary.

B. Drive system.

Change the lubricating oil at least once a year.

Attention!

Since there is only one small hole between the gearbox and the rear axle housing as an oil passage, it is necessary to wait a long time before checking the oil level again. Check that the oil level is correct using the dipstick.

B. Steering drive.

Check the grease in the steering gear room, add if necessary.

D. Front / Drive axle.

Clean all parts of the front wheel hub assembly and apply new grease.

D. Electrical system.

Check the entire system thoroughly and replace any broken parts. Apply new grease to the bearings of the electric generator.

Note:

Maintenance must be carried out at the exact time specified to ensure normal and proper tractor operation. Always remember that viewing time is highly dependent on ambient temperature and operating conditions, as well as your experience. In any case, remember that checking often is better than too rarely.

Note:

If you have any problems or difficulties in the operation or maintenance of the DONGFENG series wheeled tractor, please contact the dealer of this company.

6.3. Tractor storage.

Before storing the tractor, do the following:

Engine maintenance must be carried out in accordance with the instructions in the engine manual.

Thoroughly clean the tractor, especially the body; cover unpainted parts with appropriate material; store the tractor in a cover in a dry, well-ventilated area.

Make sure the control levers are in neutral or free (including electrical switch and parking brake).

Do not leave the key in the starter switch.

Make sure all hydraulic piston rods are tight.

Fill the fuel tank to the minimum level.

Remove the battery, apply Vaseline to the top of the battery and its terminals. Store the battery in a dark and well-ventilated place with temperatures above 10 ° C.

Place stands or other support under the front and rear axles to reduce the weight of the tractor. After that, it is advisable to deflate the tires.

Cover the tractor with a waterproof canvas.

Drain the radiator completely, especially in winter.

Section VII. Malfunctions and ways of their elimination.
7.1. Engine.

7.1.1. Unable to start engine.

A. breakdowns in the fuel system.

B. Inappropriate compression pressure.

B. Other reasons.

7.1.2. There is no oil pressure or it is inappropriate.

A. No oil pressure or too low.

Possible reasons	Elimination methods
Oil pressure too low. The oil line is not filled with oil; therefore, air enters the line. Oil filter cardboard gasket incorrectly installed or worn. The spring of the oil filter pressure control valve is worn out. Worn oil pump. Too large bearing clearance.	Top up. Review and troubleshoot. Review and replace. Replace. Replace or shrink the cardboard spacer.

B. overvoltage of the lubricating oil.

B. There is no lubricating oil in the balance shaft.

7.1.3. Exhaust smoke.

Poor automation and poor fuel combustion cause black smoke. If the engine fails to burn or water enters the cylinder, the result will be white smoke. Combustion of the lubricating oil under the piston will produce blue smoke.

A. black smoke.

Possible reasons	Elimination methods
Clogged injector valve Overload Bad valve gasket or incorrect valve timing. Uneven distribution of fuel among the cylinders. Clogged air filter. Worn cylinder liner and piston rings.	Replace and clean. Adjust the load. Adjust. Check and adjust. Test the fuel injector of each cylinder on the fuel injection pump on the bench and adjust. Blow or clean. Replace worn parts.

B. White smoke

B. Blue smoke.

7.1.4. Inappropriate power development.

Incorrect oil supply, air leakage and inadequate combustion are the cause of the following problems:

Possible reasons	Elimination methods
Plugged diesel filter. Poor injector automation. Worn fuel injection pump plunger. Deformation of the adjusting spring resulting in low rotation speed. Incorrect fuel advance angle. Clogged air filter. Air leaking in intake and exhaust valves. Incorrect valve timing. Inappropriate compression pressure.	Clean and replace filter element. Clean or replace. Replace. Adjust or replace damaged spring. Adjust. Clean or replace. Check valve clearance and gasket efficiency. Check and adjust or replace the take-off shaft. Replace cylinder liner or piston rings.

7.1.5. Unusual sound.

Possible reasons	Elimination methods
Plugged injector needle valve. The valve clearance is too large. The rhythmic beat of the valve is heard well enough. The piston hits the bottom of the cylinder head. The valve spring is broken. Loose connecting rod bearing. Too small clearance between piston and cylinder liner.	Adjust. Loosen the high pressure oil line to remove the clogged needle valve according to the injection sound, replace the clogged valve. Adjust. Insufficient lowering of the valve, it is necessary to adjust the valve sweep. Install a more sealed cylinder head gasket. Replace. Check and replace. Install a new piston and cylinder liner.

7.1.6. Serious vibration.

Severe vibration is mainly due to improper cylinder operation or improper assembly.

7.1.7. The engine is heating up.

Possible reasons	Elimination methods
Air leakage in piston rings. Water enters diesel oil; worn out oil; too high or low oil level. Assembly bearing too tight. Broken water pump or too loose belt; as a result - water overheating. The temperature regulator does not work or the amount of water in the tank is inappropriate. Broken cylinder head gasket. Clogged injector. The engine gets very hot. Too large a fuel advance angle.	Replace piston rings. Check and replace diesel oil and adjust oil level by draining or topping up. Check and adjust. Check and adjust. Check and adjust the regulator or add water. Replace. Replace. Adjust the load. Adjust as directed.

7.1.8. The engine is consuming too much oil.

7.1.9. Increased lubricating oil level.

7.1.10. Spontaneous engine operation.

7.1.11. Deviation in engine operation.

7.1.12. Self-installation of the engine.

7.2. Chassis.

7.2.1. Clutch.
1. Slipping clutch.

2. The clutch is not completely disengaged, as a result of which a complex gear change or gear change is made with sound; the tractor jerks when starting to move.

3. Vibration and noise in the clutch.

7.2.2. Brakes.

1. Ineffective braking.

2. Braking inefficiency.

3. Brakes are not released properly and overheating occurs.

7.2.3. Transmission.

1. Strange sound in the gearbox.

Possible reasons

Elimination methods

I. Strange sound in the gearbox. Worn or damaged gearbox bearings Incorrect main drive gear engagement Splined shafts are worn. II. Trip device is jammed. Severely worn or deformed shift fork. Loose shift fork retaining spring. Severely worn tooth profile or spline. III. Overheating of the transmission. Too small bearing clearance or gear side clearance. Incorrect or too high oil level. Poor quality lubricating oil.

Check and replace worn bearings or needle bearings Inspect the drive engagement area, adjust accordingly Replace defective or worn parts. Replace damaged part. Replace worn parts. Make adjustments. Add or drain lubricating oil to the specified level. Refill with new lubricating oil.

7. 2. 4. Control system.

Possible reasons	Elimination methods
I. Wobble of the front wheels. Very large front wheel bearing play or badly worn king pin gasket. Badly worn ball pin or socket. Loose steering arm or king pin fixing nut. II. Premature tire wear on the front wheels. Incorrectly adjusted toe camber. Inappropriate front wheel pressure.	Adjust bearing clearance or replace the king pin spacer. Replace the ball pin or its seat. Check and tighten the nut. Adjust the camber. Inflate the tires to maintain proper pressure.

7. 2. 5. Hydraulic steering wheel drive.

Possible reasons

Elimination methods

I. Complexity of control in the steering mechanism. Inadequate oil flow of the hydraulic pump. Air bubbles in the hydraulic system. Oil viscosity too high. Leakage in the cylinder. II. Oil leak. Damaged O-rings. Loose copper connection surface bolts and nuts. Bad welding. III. Malfunction in the steering gear. Incorrect installation position of the rotor and auxiliary shaft. Defective steel ball of the check valve in the valve body. IV. Faults in manual control.

Check the hydraulic pump and repair if necessary. Vent the system, check the suction pipe and, if necessary, repair the leak. Change oil. Replace O-ring. Tighten the bolts and nuts. Eliminate faults using a welding machine. Repair is required, contact your dealer. Repair is required, contact your dealer.

7. 2. 6. Hydraulic system.

Possible reasons

Elimination methods

I. Inappropriate lifting force or lifting system does not work. The oil level is too low or the wrong hydraulic oil category is being used. Clogged oil filter. Air in the hydraulic system. Severely worn oil pump o-ring or significant internal leakage. Main control valve stuck. Badly worn main control valve. Safety valve defective. Leakage in distributor o-rings. II. The equipment does not drop. Main control valve or closed isolation valve stuck.

Change or add oil to the specified level. Rinse the filter. Bleed the system and tighten the connector or replace the o-rings. Replace the oil pump o-ring. Move the lift control lever several times, clean the main control valve with a screwdriver, if still clogged, disassemble and flush. Replace worn parts. Adjust or replace safety valve. Replace o-ring or worn parts as needed. Refer to Section I-5 or lock the isolation valve to its highest position for troubleshooting.

7. 2. 7. Malfunctions of air braking.

Possible reasons

Elimination methods

I. Inadequate air pressure. Air leakage in the pipeline. Damaged air pump inlet or outlet valve springs. Damaged air pressure gauge. Safety valve damaged or not closing completely. II. The control valve does not return to its original position. Dust in the control valve. Oil or water in the control valve. III. The trailer brakes earlier or later. IV. Highly consumable air pump lubricating oil or gasket burnt Plugged oil return line. Piston rings or cylinder liner badly worn. Plugged oil line or leak in the oil intake line.

Check and rectify faults. Replace damaged springs. Replace damaged parts. Repair or replace. Remove dust. Drain the oil and water from the air tank and clean the control valve. Adjust the length of the brake valve adjusting rod, it is necessary that the trailer brakes slightly earlier than the tractor or at the same time. Eliminate faults. Check and replace if necessary. Replace piping or repair leak.

7. 3. Electrical system.

7 .3. 1. Battery.

7. 3. 2 Generator.

Possible reasons

Elimination methods

I. The generator is not working. Damaged rectifier. The carbon brush is seized or not in contact with the collector ring. Open circuit, short circuit in stator or rotor winding, or poor insulation of the earth circuit. II. The generator is producing inappropriate power. Damaged rectifier. Poor carbon brush contact. Short circuit of the rotor and stator windings. III. Generator output current is uneven. Loose alternator belt. Short circuit or broken rotor and stator windings. Loose carbon brush spring or poor carbon brush contact. Loose terminals. IV. Strange sound in the generator. Incorrectly installed generator. Generator bearings damaged. The rotor hits the stator or other parts.

Check and replace damaged parts as necessary. Check the size and force of the carbon brush spring and repair or replace as necessary. Repair or replace damaged parts. Replace damaged rectifier Eliminate faults. Repair or replace the rotor or stator winding Adjust the belt tension or replace a worn belt if necessary. Repair or replace the stator and rotor windings. Repair or replace the carbon brush spring. Install the generator correctly. Replace generator bearings. Check and repair damaged parts.

7. 3. 3. Starter.

Possible reasons

Elimination methods

I. Starter does not work. Broken connecting winding or poor contact of the connecting winding with the switch contacts. The fuse has blown. The carbon brushes are not in contact with the commutator. Short internal starter circuit. II. The starter motor works but does not start the engine. Worn shaft sleeve, as a result of which the rotor is in contact with the magnetic pole. Poor contact of the carbon brushes with the commutator. Oiled or burnt surface of the switch. Damaged weld seam between the protective structure of the wire and the switch. Poor cable and clamp connection. Insufficiently charged battery. III. The starter motor continues to run after starting the engine. Damaged connection to solenoid switch. Incorrect adjustment of the supply of the steel magnetic circuit of the solenoid switch. IV. The starter starts to work and strikes the face of the ring gear before engaging. The feed of the steel magnetic circuit of the solenoid switch is too low.

Replace the connecting winding, clean the oil stains on the clips and terminals, and tighten all the nuts at the connections. Replace the fuse with the correct rating. Charge the battery. Check the carbon brushes and adjust the spring force of the brush holder to make proper contact. Replace the shaft sleeve. Flush the surface of the switch, clean the contact surface, and adjust the spring force. Sand the rough surface of the switch, remove oil stains on the surface of the switch. Eliminate faults with a welding machine. Tighten the clamping nuts to make a good connection. Repair the solenoid switch connections. Recharge the battery. See section II - 6. Adjust the flow of the steel magnetic circuit of the solenoid switch.

Dongfeng 304 is a versatile mini tractor with a cab, the price of which does not coincide at all with its quality ...

The thing is that the Chinese have made a really sturdy mini-tractor, a kind of low-cost workhorse that will plow, dig, clean, load, drill, mow, collect and transport, in general, the DF-304 is suitable for absolutely any purpose. The main thing is to give him a task!

The DongFeng 304 mini tractor with a cabin has:

Locking four-wheel drive,

GUR,

Hydraulic outlets,

A cabin with a stove,

Separate brakes,

Glow plugs,

Diesel engine electric starter 30 hp,

Mechanical gearbox,

Back 3rd point of the 1st category.

Two-speed PTO,

This is if you very briefly describe the technical characteristics of the 304th ...

• Buy a mini Dong Feng DF-304 tractor with a cab, put it on the state. accounting, pick up attachments will not take you much time! One visit to us, and you are already the owner of this mini technique.

And for those who are interested in a detailed technical description of the technique, we give additional technical arguments - for the DF-304!

Convenient and safe

Perhaps you already have an old tractor on the farm, which constantly breaks down and requires more and more capital investments ...

Probably, the old tractor is not convenient to use or simply cannot fulfill all the tasks that are assigned to it ...

What the new DongFeng DF-304 will offer us:

Thoughtful head lighting;

Steel hood;

Wide rear-view mirrors;

Spacious cabin with panoramic glazing;

Stove for comfortable work in winter;

Control and measuring devices;

Safety belt;

Clear control of all mini tractor systems;

PTO with 2 speeds;

Glow plug for quick start in cold weather;

Lightweight hydrostatic steering;

Operator's seat with settings;

Electric starter;

Compressor (for some configurations)

Separate shoe brake system;

Electric circuit 12W single phase

Inside the cabin there are no frills in the form of an air conditioner or radio (there is audio preparation). Here you will not find decorative plastic, which is used to sheathe iron in more expensive models of Chinese mini tractors.

And the excesses, you can safely add in the form of additional options when buying ... Well, or modify it on your own to your liking.

Gearbox and PTO

For the choice of the most suitable operating mode of the equipment, and therefore fuel economy, the manual gearbox of the DF 304 mini tractor is equipped with 8 forward gears and 2 for reverse. This will allow you to find the optimal travel speed from 1.73 km / h to 31.9 km / h.

By choosing the right one, you will achieve a professional result when working with special attachments. For example, in secondary tillage with a rotary tiller.

The PTO is controlled by the operator using the clutch pedal and the rotation speed selector lever from 540 to 1000 rpm.

Hydraulics and Rear Hitch

The hydraulic system is paired with a standard European Category 1 three-point system. Powerful enough to provide lift capacity at the arm ends of up to 496 kg attachment weight.

• Dongfeng DF-304 has 2 pairs of hydro-outputs with quick couplers. So, even a child can quickly change attachments that need hydraulics!

(From ed. Do not trust children with a mini tractor!)

The hydraulic system is combined and has one hydraulic tank. In a sense, this is an advantage! It's all about the extremely low temperatures in winter in our country, when the transmission fluid freezes and turns into "jelly". The tractor gearbox will quickly warm it up to operating temperature, and this will significantly reduce the time for preparing the tractor hydraulic system for work!

• Power steering is already included as standard. It is very convenient to operate a mini tractor with a front loader or plow a field!

Quality

These small Chinese mini diesel tractors of traction class 0.6 are unpretentious and reliable. They can last 12 years or more! The warranty period for Dongfeng DF 304 with a cab (units and assemblies) is one year or 1,000 m3 / h.

• Do not forget about routine maintenance and use this mini tractor, only with the one attached, which is regulated by the manufacturer!

Since 2009, we have sold and serviced dozens of Dongfeng mini tractors! It is difficult to calculate how many thousands of filters, liters of oil and other consumables have been replaced by our "F-TECH 24" Service Center.

Every tractor sold by us undergoes full pre-sale preparation before shipment. Over the course of our work with this technique, we have gained enough experience for the following conclusion:

Disadvantages of the model: Oil seals of the front axle (it happens that they sink and you just need to follow them); Often not neat factory installation of electrical wiring (we eliminate it during pre-sale preparation); A flimsy fuel filler cap (it happens not often, but if something happens, we immediately change it to a new one).

All the main units and elements of the working systems of the DF-304 mini tractor, such as bridges, gearboxes, motors, hydraulics, are made with high quality and will not cause trouble if used correctly!

• The price of the DongFeng 304 tractor already contains all the service work for assembling and preparing for heavy work. You don't need to pay extra when buying!

Our customers are always satisfied with their choice and decision to buy a mini tractor from us.

coolant

During the operation of the tractor, various unfavorable factors can lead to premature wear of many components and assemblies, which reduces their performance and ultimately disables the machine. In addition, the consumption of fuel, oil, grease, coolant, etc. increases. In addition, the conditions for servicing the tractor are violated, the general technical characteristics of the tractor deteriorate. As for the technical condition of the main components and assemblies of the tractor, the consumption of working materials, the tractor driver and repairman must take timely measures to maintain the machine. Namely: cleaning, securing, adjusting, replacing, fitting, etc. to ensure the normal functioning of components and assemblies and regular service of the tractor and is called maintenance of the tractor. Tractor maintenance is extremely important work. The maintenance of the tractor is of a preventive nature, and one should not think that it is unnecessary while the tractor is running. Thinking only about using the tractor and not about maintaining it is very harmful.

1. 
   Maintenance rules

In order to guarantee the normal operation of the tractor and increase its service life, it is necessary to strictly follow the maintenance rules. The maintenance rules for YTO-300/304/350/354/400/404 series tractors are based on the number of hours worked and are classified as follows.

1. 
   Daily maintenance

1. 
   Remove dirt and stains from the tractor and agricultural implements. Clean the air filter if working in sand and dust.
2. 
   Check all tie-down bolts and nuts to see if they are loose, especially the nuts on the front and rear wheels. Tighten them if necessary.
3. 
   Check the oil level in the oil sump, water tank, oil tank, hydraulic jack housing, if not enough, add oil to the norm. Stop the engine for 15 minutes if checking the oil level in the sump.
4. 
   Check the joints to see if there is air leakage, water and oil leakage, if there is a leak, find the cause and fix it.

1. 
   Check the tire pressure, if necessary, inflate.
2. 
   If working on wet soil, lubricate the following points with oil (if working on dry soil, every two shifts):

and... 2 points along the base of the swinging arm on the front axle, the right and left control arms, the drive axle ball joint.

b... 3 points on the swing arm, left and right axle (for 2-axle tractors).

at... 1 point on the clutch pedal shaft.

r... 1 point on the brake pedal shaft.

d... 1 point on the right lift arm.

2. Maintenance after every 50 hours of operation

1. 
   Perform daily maintenance.
2. 
   Check the tension of the V-belt.
3. 
   Add oil to the grease gun nipple of the water pump fan.
4. 
   Check the oil level in the transmission, rear axle, transfer case, front axle, steering gear, oil tank and add oil as needed.
5. 
   Check the free play of the clutch pedal, left and right brake pedals, adjust if necessary.
6. 
   Check the electrolyte in the battery. The liquid level should be 10-15mm above the electrode plates, add distilled water if not enough. If the density of the electrolyte does not correspond to the normal level, add 1.28 g / cm³ of electrolyte to the norm.
7. 
   Check the oil filter, clean the filter element with diesel fuel.
8. 
   Unscrew the air bleed cap and drain plug of the oil filter, drain accumulated water and dirt.
9. 
   Clean the hydraulic system with diesel fuel.

3.Maintenance after every 250 hours of operation

1. 
   Carry out a service routine after every 50 hours of operation.
2. 
   Change the oil in the oil sump, clean the oil sump and filter screen.
3. 
   Change the filter element of the oil filter, clean the filter housing.
4. 
   Clean the fuel filter cartridge. Bleed the air from the oil line after replacing the filter.
5. 
   Clean the oil filter cartridge. Change the oil.

4. Maintenance after every 500 hours of operation

1. 
   Carry out a service routine after every 250 hours of operation.
2. 
   Check valve clearance, injector injection pressure and fuel atomization, adjust if necessary.
3. 
   Replace the fuel filter element.
4. 
   Replace the air filter element. (Replace sooner or later depending on the dust in the working area.)

1. 
   Change the oil in the injection pump housing.
2. 
   Change the oil in the gearbox, rear axle, transfer case, front axle (only for 4-axle tractors), hydraulic system, steering gear.
3. 
   Check and adjust the front toe-in.
4. 
   Check the free play of the steering wheel.
5. 
   Rinse the battery with strong hot water. Check the density of the electrolyte, which must be at least 1.24 g / cm³. If you find that the battery is flat, charge it by removing it from the tractor.

5. Maintenance after every 1000 hours of operation

1. 
   Carry out a service routine after every 500 hours of operation.
2. 
   Wipe off the dust from the radiator pipes, clean the diesel engine cooling system.
3. 
   Decide what to do when you remove the cylinder cover for inspection or maintenance, it all depends on the previous operation of the diesel engine.
4. 
   Secure the cylinder head bolts located on the torque rod.
5. 
   Clean the fuel tank.
6. 
   Decide if the hydraulic lift needs maintenance depending on its operating condition.
7. 
   Remove the generator for testing.
8. 
   Decide whether to disassemble the starter motor for service based on its condition.
9. 
   After maintenance and installation in place of the removed components and assemblies, a small trial test should be carried out on the tractor, while adjusting, if necessary

6. Maintenance of the tractor after a long standing.

1. 
   If the tractor is not used for a long time, it should be stored in a dry garage and, using a support stand, make sure that the front and rear wheels do not stand on the ground.
2. 
   Keep the tractor body clean. Lubricate all lubrication points with oil.
3. 
   Drain the coolant. Close the exhaust pipe opening.
4. 
   During storage, start the engine every three months. Leave it on for 20 minutes at each speed, see if everything works fine.

1. 
   Fuel, lubricating oil and coolant for the tractor

1. 
   Fuel

Summer: 0 # or 10 # diesel (GB252 - 81)

Winter: - 10 # or - 20 # diesel (GB252 - 81)

1. 
   Oil for gearbox, transfer case, hydraulic lift, steering gear, front axle

Summer: N1000D hydraulic and transmission lubricating oil

Winter: N68 hydraulic and transmission lubricating oil

1. 
   Machine oil

Machine oil type CC.

If the temperature is below - 24 ºС, use 5W / 30 # oil. If the temperature is below -15 ºС, use 15W / 40 # oil. If the temperature is between -10 ºC and 0 ºC, use 30 # oil. If the temperature is over 5 ° C, use 40 # oil.

1. 
   Lubrication.

ZG - 2 # calcium grease (GB491 - 87)

1. 
   Cooling water

It would be best to use clean, soft water for the engine cooling system. If using well or well water, boil it to soften.

6. The battery uses distilled water. A little boiled and cooled water or rainwater, if necessary, can be added to the battery. Do not use salt water, tap water containing chlorine or chemically soft water or river water.

Part 6. Adjustment

1. 
   Clutch device and adjustment

6.1.1. 9 "one way dry clutch

The clutch device is shown in fig. 6 - 1.

1. Clutch adjustment.

The gap between the release lever (2) and the release bearing (5) must be 2.5 ± 0.1 mm. Adjustment height from clutch pressure plate edge to clutch fork 43.5 mm. The difference in height between the 3 ends of the release lever should not be more than 0.2 mm. Adjustment method: loosen the lock nut (4), turn the adjusting nut (3) until the clearance between the release lever and release bearing is 2.5 ± 0.1 mm. The difference in height between the 3 ends of the release lever should be no more than 0.2 mm. Then secure the lock nut (4) and the adjusting nut (3). 2) Free travel of the clutch pedal (9) is 20 - 25 mm

1. 
   Minimum clearance.

2. Grease the front clutch bearing.

Lubricate the front clutch bearing (1) well before assembly. The release bearing (5) does not require additional lubrication under normal conditions. After 1000 hours of tractor operation or if a strange sound appears in the bearing, remove the bearing and clean it.

Then place the bearing in heated, calcined grease to fill it with grease. After cooling, take it out, wipe the surface, and put it back in its original place.

3. Precautions when working with the clutch

1) Disconnecting the clutch must be done quickly and completely, and engaging smoothly and slowly.

2) When driving, do not put your foot on the clutch pedal; do not slow down by half-pressing the pedal; clutch engagement is prohibited when descending or crossing an obstacle.

3) The surface of the friction linings must be free of oil stains. If it is soiled with oil stains, it should be cleaned with gasoline.

6.1.2. 9 "dual direction dry clutch

The clutch device is shown in fig. 6 - 2.

1. Adjustment

Dual direction clutch adjustment includes main clutch adjustment and auxiliary clutch adjustment.

1) Adjustment of the main clutch.

and. The gap between the release lever (4) and the release bearing (5) must be 2.5 ± 0.1 mm. The difference in height between the 3 ends of the release lever should not be more than 0.2 mm.

Adjustment method: loosen the lock nut (3), turn the adjusting screw (2) until the gap between the release lever and release bearing is 2.5 ± 0.1 mm.

The difference in height between the 3 ends of the release lever should be no more than 0.2 mm. Then secure the lock nut (34) and adjusting screw (2).

b.

Adjustment method: loosen the lock nut (11) on the main link (10), turning the main link, change its length until the free travel of the clutch pedal (9) becomes 20 - 25 mm. Then secure the lock nut (11).

at. Minimum clearance.

Adjustment method: loosen the lock nut (6), turn the bolt (7) until the clearance between the hex head of the bolt (7) and the pivot arm of the clutch fork (8) is 9.5 - 11 mm. Tighten the lock nut (6).

2) Adjustment of the auxiliary clutch

The distance between the ends of the release lever of the main clutch and the release lever of the auxiliary clutch should be 8 - 9 mm. The difference in height between these levers should be no more than 0.2 mm.

Adjustment method: loosen the lock nut (12) by adjusting the ball nut (13), make sure that the distance between the ends of the release lever of the main clutch and the release lever of the auxiliary clutch is 8 - 9 mm, and the difference in height between these levers is not more than 0.2 mm. Then tighten the lock nut (12)

2. Lubrication of the front bearing for the 9 "dual direction clutch is the same as the lubrication of the front bearing 9" of the single direction clutch.

3. Precautions for 9 "dual direction clutch are the same as for 9" one way clutch.

6.1.3. 10 "one-way clutch.

The clutch device is shown in fig. 6 - 3.

Adjustment.

The wear of the clutch discs ultimately leads to a decrease in the clearance between the head of the release lever and the reference plane of the release bearing. Sometimes to the point that the release lever head touches the release bearing, causing the bearing to heat up and not function properly. The clutch must be constantly checked and adjusted.

and. The clearance between the release lever (2) and the release bearing (5) must be 2.5 ± 0.1 mm. Adjustment height from clutch pressure plate edge to clutch fork 42.5 mm. The difference in height between the 3 ends of the release lever should not be more than 0.2 mm.

Adjustment method: loosen the lock nut (4), turn the adjusting nut (3) until the gap between the release lever and release bearing is 2.5 ± 0.1 mm. The difference in height between the 3 ends of the release lever should be no more than 0.2 mm. Then secure the lock nut (4) and the adjusting nut (3).

b. Free travel of the clutch pedal (9) is 20 - 25 mm.

Adjustment method: loosen the lock nut (4) on the main link (10), turning the main link, change its length until the free travel of the clutch pedal (9) becomes 20 - 25 mm. Then secure the lock nut (11).

at. The minimum clearance is 7 - 8 mm.

Adjustment method: loosen the lock nut (6), turn the bolt (7) until the gap between the hex head of the bolt (7) and the pivot arm of the clutch fork (8) is 7 - 8 mm. Tighten the lock nut (6).

2. Lubrication of the front bearing for the 10 "one-way clutch is the same as the bearing lubrication for the 9" one-way clutch.

3. Precautions for the 10 "one-way clutch are the same as for the 9" one-way clutch.

1. 
   Brake device and adjustment

Free travel of the brake pedal (1) - 25 - 40 mm.

When the brake friction discs are worn out, the brake pedal free play increases and the brake may not work well. In this case, adjustment is recommended.

Look at fig. 6 - 4. Loosen the lock nut (2), adjust the pull rod (3) until the free travel of the pedal (1) is 25 - 40 mm. Make sure that the left and right brake pedals have substantially the same free play. After adjustment, tighten the lock nut.

Fig. 6 - 4 Brake

1. pedal 2. lock nut 3. rod

1. 
   ... Rear axle device and adjustment

The rear axle consists of the main drive train, differential, differential lock and PTO, etc. 1. The device of the central drive mechanism. It consists of a spiral bevel gear. (Fig. 6-5) The rear end of the bevel gear shaft (7) is supported by a bearing (6) and the front end is supported by a bearing (8). The splines on the end of the shaft are connected to the splines of the gearbox. 2. Adjustment of the small bevel gear bearing. (See fig. 6 - 5) Two roller bearings (6) on the bevel gear shaft (5) are pre-installed. The bearings carry loads during operation, which can lead to axial lift and reduce the preset force. Check and adjust them periodically (every 500 hours of operation).

Fig. 6 - 5 Central drive 1.ball nut 2. lock washer 3. adjusting washer 4. tapered roller bearing 5. bevel gear shaft 6. tapered bore bearing 7. differential 8. adjusting nut

To adjust, loosen the ball nut (1), then turn 1/15 to 1/10 turn from 124º to 36º. Now tighten the ball nut (1), secure it with the lock washer (2).

3. Adjustment of differential bearings. (See fig. 6 - 6)

Differential bearings (1) and (9) are also pre-installed. The bearings carry a load during operation that can lead to axial lift of the flat gear, which reduces their nominal force. Check and adjust them periodically (every 500 hours of operation). When adjusting, tighten the adjusting nut (17) to guarantee an axial force of 350 Newtons, equivalent to a resistance of 2.5 - 5 Nm.

4. Adjustment of the gearing of the central drive gear. (See Figure 6-5)

Gear play due to wear on the gears does not affect their performance. Even if a pair of bevel gears are not in initial engagement due to wear, usually no adjustment is required if the gears are operating normally. However, if the gears are not working properly, after a major overhaul and after replacing the bearings in the differential and in the small bevel gear, the gear meshing must be adjusted to the initial bearing force.

1) Checking the clearance in the gearing.

Place a lead plate between the surface of the non-meshing tooth head and the gear. Rotating the gear, press in the lead plate.

Take out the lead plate and measure the thickness of the plate at the thick end, this is the gap in the gearing. The normal clearance should be 0.15 - 0.30 mm. Take the same measurements at three different points on the gear. The difference in measurements of three different points must be less than 0.1 mm. If you find a large gap, use the adjusting nut (8) to adjust. The grand total of left and right nut adjustments should be zero.

2. Check the configuration of the contacts of the teeth of engagement.

Apply a thin layer of red paint evenly to the bump of the gear teeth. The concave surface of a small conical tooth is pressed forward. Rotate the gear to leave a mark on the small bevel tooth. Good engagement should be in the middle of the tooth depth and close to the small end, but not less than 3-4 mm from it. The length of the contact lines must be at least 60% of the tooth width and at least 50% of the tooth depth. Good contact of the tooth configuration of the engagement can be obtained by pressing the small shaft of the bevel gear in the axial direction and turning the adjusting nut together with the installation of shims of different thicknesses. To keep the differential bearing in its original position, adjust it so that the grand total of the left and right nut adjustments in the differential is zero. (See Figure 6-5)

Fig. 6 - 6 Differential bearing 7211 E 2. differential locking device 3. gear of the left axle shaft 4. planetary wheel 5. planetary wheel shaft 6. flat gear 7. stopper 8. adjusting nut 9. bearing 2007113 10. differential case 11. gear of the right axle shaft 12. washer axle shafts 13. locking bolt 14. support bolt 15. washer 16. bearing support 17. adjusting nut 18. screw M10 x 25 19 washer 10

If, during adjustment, you find that the contact configuration of the teeth contradicts the gap in the gearing (good contact configuration and poor clearance), the configuration of the teeth contacts should be considered a standard, and the gap should not be less than 0.15 mm.

Flat gear wheel (6) in fig. 6 - 6 is attached to the differential housing (10) with 6 bolts (13) and 2 support bolts (14). A tapered roller bearing (1 and 9) is installed on each side of the differential housing, which is connected to the rear axle housing via a bearing support (16) by 6 bolts (18). Inside the rear axle housing there are two planetary wheels (4) and two axle gears (3 and 11). Washers (12 & 15) are inserted between the planetary wheel and the axle shaft and differential housing. There is a groove on one side of the planetary arm. Both ends are connected by bearing bolts (14) to prevent rotation and axial movement of the planetary arm.

The differential control mechanism is located on the right side of the tractor. (See Fig. 6 - 7). It consists of an interlock foot lever (1), a forked lever (5), a return spring (3) and an interlock assembly (10). Design and adjustment of the final drive gearbox 1. The device of the final drive reducer. The final drive (see Fig. 6 - 8) consists of a center gear (1), a ring gear (6), planetary carrier (3) and planetary gear (2). The central gear wheel (1) and the semi-axle are integral, the splines at the front end are connected to the semi-axle. The ring gear (6) is installed between the shaft cover (10) and the brake box.

3 planetary gear satellites connected to the central gear and the ring gear are mounted on the planetary gear coupling (3) by means of a needle bearing (4) and a planetary gear shaft (5). A shaft cover (10) with two roller bearings (9 and 12) supports the drive shaft (11). The drive shaft (11) is connected to the planetary gear rod (3) by splines and is fastened with a locking screw (7). To improve the meshing between the center gear and the planetary gear and to distribute the uniform load, the center gear is in equilibrium. The permissible gap between the planetary gear link (3) and the screw (13) is G \u003d 0.2 - 0.3 mm

Fig. 6 - 8 Final drive reducer 1.central gear 2. planetary gear 3. planetary carrier 4. needle bearing 5. planetary pinion shaft 6. ring gear 7. screw 8. gasket 9. roller bearing 10. shaft guard 11. drive shaft 12. roller bearing 13. spacer 14. adjusting washer

2 .. Final drive adjustment. (See fig. 6 - 8)

Free gap G \u003d 0.2 - 0.3 mm is preset. And you shouldn't adjust it during normal maintenance. However, the adjustment should be done after repair or replacement of the gear train. Adjustment: measure the clearance A between the end of the drive shaft (11) and the roller bearing (9). Measure the depth of the planetary keyway (3) and the width C of the spacer (13). Select the adjusting washer (14) of the appropriate thickness using the formula δ \u003d A - (B + C + 0.2 - 0.3 mm) and place it in the position shown in fig. 6 - 8. After adjustment, screw on the lock nut, lock it with a washer.

1. 
   Front axle device and adjustment

1. Front axle device (See fig. 6 - 9)

The front axle of the tractor is tubular with an adjustable wheel rim and is located in front of the engine. The engine is attached to the bracket with 6 bolts. The swing arm is supported by the two ends of the bracket. The swing arm fits into the welded pipe (8). There are 3 bolts (1) on each side of the tube for attaching the left and right collar. 2. Adjustment. 1) Adjusting the axial clearance on the front axle. (See fig. 6 - 10) A good front axle clearance should be 0.05 - 0.15 mm. Whenever the gap increases to 0.4 mm, an adjustment must be made. Adjustment method: Raise the front wheel off the ground. Remove the bearing cover (4). Pull out the split pin (3). Loosen the nut (2) to adjust the axial clearance, and then turn the nut back 1/30 to 1/10 turn. Insert the cotter pin (3), replace the bearing cover (4). 2) Adjustment of toe-in of the front wheels. (See Fig. 6 - 9) After every 500 hours of tractor operation, check the front toe-in of the front wheels, and also when the front wheels swing heavily or the tires wear out quickly. The normal toe-in of the front wheels is 4 - 8 mm.

Figure: 6 - 9 Front axle 1.bolt 2.nut 3.washer 4.gasket 5.right swing arm 6.right-handed nut 7.bush 8.guide bush 9.main transverse link 10.Bolt 11.Nut 12.Auxiliary Traverse Link 13.Left Threaded Nut 14.Left Swing Arm 15.Vertical Link

If the toe-in of the front wheels is far from these parameters, use the following adjustment methods.

Stop the machine on a level surface. While turning the steering wheel, set the front wheels in the forward direction. Loosen the locknuts (6 & 13) of the cross links. Rotate the cross rods (9 & 12). In the middle of the tires, measure at the same axial height at the beginning and end. The difference should be B - A \u003d 4 - 8 mm. After adjusting the toe-in of the front wheels, tighten the left and right locknuts.

3) Adjustment of the front wheel track width. (See Fig. 6 - 9) The front axle has two tubes, one inner and one outer. The track width is regulated by a telescopic tube with a length of 1150 - 1450 mm. There is a distance of 100 mm between each gap. Adjustment method: loosen the nut (2). Remove the bolt (1). Loosen the lock nut (11) of the transverse link and remove the bolt (10). Move the rack (7) and the additional transverse rod (.12) to the desired position. Secure them with nut and bolt.

1. 
   The device and adjustment of the steering mechanism

1. The device and adjustment of the worm gear idling.

1) Device. The steering shaft is attached to the transmission with 4 bolts. The angle between the steering shaft and the vertical center line of the tractor is 65º, the mechanism structure is shown in fig. 6 - 11. The steering shaft (3) together with the worm gear (8) is installed in the steering box housing supported by two bearings 977907 (10) and 977907k (11), which are installed in the steering box housing. The steering arm shaft (3) is connected to the steering box housing by means of a bushing, the left end of which is supported by the shank (2), and the right end is supported by bearing 922205 (5) on the side cover of the steering box housing (4).

Fig. 6 - 10 Adjusting the axial clearance of the front axle bearing 1. cogwheel 2. castellated nut 3. cotter pin 4. bearing cap 5. retaining ring 6. bevel gear

This is so that the intermediate wheel mounted on the steering shaft is connected to the worm screw.

2) Adjustment.

The worm gear bearing must be pre-installed before installing the steering gear. Decrease or increase the spacer between the steering housing and the bottom cover (12). Install the 4 bolts of the steering lower cover, while the lower cover presses the bearing. Correct bearing installation assumes that before the swing arm is assembled with the intermediate wheel, the force on the steering wheel should be 2.5 - 5 N. The steering wheel rotation radius is 190 mm.

Distance between the center line of the idler wheel and the worm screw 6mm

Used to adjust the meshing clearance. Unscrew the right adjusting nut (6), using a special wrench, turn the adjusting screw on the steering pivot arm to rotate the steering arm axially.

Apply a force of 8 - 13 N tangentially along the radius of the steering wheel of 190 mm. To check, turn the steering wheel 200º from the middle to the left. When the intermediate steering wheel of the steering arm is in the extreme positions, the steering gear engagement gap should be within 30º. With the intermediate wheel in the middle, turn the steering wheel left and right 45º, the steering gear engagement gap should be zero.

2. Design and adjustment of the cyclical hinge and steering gear link. 1) Device The cyclical joint and steering linkage consists of a control lever, a steering worm, a steering nut, a lowering lever and a steering gear box. (See fig. 6 - 12) The steering gear worm (4) is attached to the steering gear box (2) with two 72006E tapered roller bearings. When you turn the steering wheel, the steering worm starts to rotate and drives the steering gear nut by moving it up and down with two rows of steel balls.

Fig. 6 - 11 Idling ball worm gear 1.steering arm 2.bushing 3.switching control arm 4.side cover 5.bearing 922205 6.nut 7.steering column 8.control handle with worm assembly 9.grease nipple 10.bearing 977907 11.bearing 977907k 12.bottom cover 13.steering box

A rack on the steering nut drives the rocker. As a result, the control lever (1) moves forward and backward. The lowering lever (3) is connected to the control box (2). The axial position is fixed with an adjusting nut (6). When assembled, the lowering lever has a reverse tilt angle of 10º. The steering gear has a grease filling hole. 2) Adjustment and.Working contact adjustment. The 7206E tapered bearing must be pre-installed so that the steering gear can operate normally. As a result of the operation of the bearing, the backlash increases. The backlash can be eliminated or reduced with the shim (5).

Its preset degree of tension must correspond to the acting force

The steering gear worm (4) on the steering wheel and equal to 3 - 5 Newtons, provided that the lowering lever is not engaged.

b. Adjustment of the meshing gap between the gear rack and the rocker arm.

As a result of work, due to wear of the toothed rack and the link, the clearance increases, which in turn increases the idle speed of the steering wheel. If the idle speed of the steering wheel is more than 20º, adjustment is necessary.

How to adjust: unscrew the adjusting nut (6) on the right side of the steering column, turn the lead screw (7) clockwise, the engagement clearance will be reduced. It should be adjusted with the lowering lever in the center position. If the handlebars rotate 45º left and right, then there is no gap between the rocker arm and the rack. Tighten the lock nut after adjustment to prevent oil leakage.

3 .. Adjusting the hydraulic control system

1) Device.

The YTO-354/404 series tractor uses a full-cycle hydraulic steering gear, a valve-type cycloidal rotor mechanism.

The system consists of a gear pump, steering gear, steering cylinder, oil tank, steering column, etc.

If the tractor is driving in a straight line, the steering wheel does not rotate, the valve core and the steering valve bushing are in the neutral position. All grease channels on the steering, which are connected to the steering cylinder, are closed. Pressurized oil returns to the fuel tank from the steering gear.

When the steering wheel is turned to the left or right, the valve core and the valve sleeve, rotating relative to each other, open the oil line for the return oil. Pressurized oil into the steering passages that are connected to the steering cylinder opens the lubrication passages to the other steering cylinder oil passages. Simultaneously with the rotation of the steering wheel, the valve core automatically transfers the energy of the steering wheel to the rotor of the valve sleeve. The oil pressure from the oil pump to the rotor, as well as the oil pressure from the rotor to the oil pump, is provided constantly under operating conditions, thereby creating the ability to make left and right turns.

When the steering pump cannot provide oil pressure (for example, the diesel engine does not work) in cases of emergency, you can use your own physical strength to turn the steering wheel. The core valve works as before, but the rotor is used as a hand pump, pumping oil directly into the hydraulic cylinder. The valve core oil that comes from the fuel tank flows to the steering gear through the one-way valve, but the one-way valve between the steering pump and the steering gear is closed to prevent leakage of hydraulic lubricating oil.

2) Adjustment.

The tractors of this series are equipped with a full cycle hydraulic steering gear BZZ1 - E80C. A constant steering pump is used here. This pump is a gear pump. There is also a continuous valve and a safety valve. In order to ensure good responsiveness, the oil pressure throughput that the oil pump delivers to the steering gear and pressure system has nothing to do with the engine speed and is constant. The continuous valve ensures reliable and high-quality operation of the steering system. A safety valve protects the system from overload. It regulates the pressure in the system with an adjusting shim. The pressure in the system is adjusted at the factory, so the user does not need to adjust himself.

6.7. Structure and adjustment of the rear wheel track

The rear wheel track width is adjusted by changing the position of the rim and wheel center in the range 1200 - 1600 mm. There are five rear wheel track widths: 1300 mm, 1400 mm, 1500 mm and 1600 mm. (See fig. 6 - 13). 1300 mm is the standard track gauge.

6.8. Design and adjustment of the hydraulic linkage

If the tractor has been running for a while, or if the parts of the hydraulic attachment are worn out, or it has been disassembled for repair, it must be adjusted.

1. Adjustment of the distributor (See Fig. 6 - 14)

1) Check the valve lowering sleeve.

and. Remove the valve stem down.

b. Place the control handle in the highest lift position. (The main valve is in the lifting position). Measure the clearance (h1) between the steel ball (4) and the front face of the valve lowering sleeve (5).

at. Place the control handle in the down position. (The main valve is in the lowering position). Measure the clearance (h2) between the steel ball (4) and the front face of the valve lowering sleeve (5).

g. A good clearance is h¹ - h² \u003d 2º (+0.20) mm. If the gap is different, then raise or lower the shim (6) until the required gap is found.

etc. Secure the stem of the valve lowering bushing.

2) Reinstallation of the adjusted distributor in the hydraulic valve tappet.

2. Adjustment of the hydraulic valve tappet

Draft regulator adjustment. (See fig. 6-15)

and. Insert the pivot arm (1), bracket (2), and thrust adjusting spring (4), adjusting bolt (3) so that the adjusting spring only touches the pivot arm. Tighten the lock nut. (five).

b. Install the pressure plate (8) on the lift. Insert an intermediate arm (9) between the right pressure plate (8), the feedback adjusting arm (10) and the adjusting tie rod (6).

at. Move the control handle to the “Down” position. Start the tractor. Move the control handle gradually to the "Lift" position. Increase the feedback lever (10) if the lift is insufficient and shorten the feedback lever (10) if the lift is very high. Do this until the clearance between the mark on the outer lift arm and the mark on the lift body is 3 mm, with the control handle at the highest lift point. (As long as the gap between the inner lift arm and the lift body is about 5mm). Repeat raising and lowering three times, tighten the adjusting bolt on the feedback arm after the desired height has been adjusted.

6.9. Front drive device and adjustment

1. Adjustment of toe-in of the front wheels. (See fig. 6 - 16)

Correct front toe-in is 4 - 11 mm with the front wheels straight. Toe adjustment of the front wheels is carried out in this way.

Loosen the lock nut (2) at each end of the tie rod coupling (3). Rotate the transverse link (4) to adjust. The length to the front of the wheel should be shorter than the length to the rear and be 4 - 11 mm. (When measuring the length, the steering wheel must be in the middle). Tighten the tie rod (4) with the lock nut (2).

2.The device and adjustment of the front axle.

(See fig. 6 - 17)

Fig. 6 - 17 Front main drive and rear propeller shaft 1.adjusting washer 0.2, 0.5, 1.0 2.bearing 36210 3.gear 4.drain plug 5.adjusting washer 0.2, 0.5, 1.0 6.retention ring 7.axle shaft 8.differential 9. bushing 10. adjusting washer 11. thrust washer 12. nut 13. bearing 2007107 14. swivel unit 15. bearing 7208 16. drive gear 17. adjusting nut 18. driven gear 19. half-shaft housing 20. bearing 209 21. bevel gear 22. bearing 36208 23. control lever 24. central suspension bushing 25. bushing 26. shim 0.2, 0.5, 1.0 27. bevel gear 28. drive axle housing 29. front drive side cover 30. shim 0.2, 0.5, 1.0 31. central suspension 32. crankcase protection

Front-wheel drive power is transmitted via the transfer case linkage to the front universal joint. Power is distributed to the two axle shafts via front-wheel drive to drive the wheels.

The axial rotation of the two bearings (13 & 14) of the driving gear increases with use, so it is necessary to reduce the axial rotation by tightening the small round nut (12) to help increase the meshing clearance of the driving gear (16) and the driven gear (18) of the front cardan. Remove the shim (10) of the correct thickness or adjust the nut at both ends of the front differential.

1) Adjustment of the upper part of the central suspension.

Disassemble the control arm (23) and center suspension (24). Depending on the gap, sharpen the guide bush (25) at the bottom of the bevel gear (27), making it shorter, and use the shim (26) to achieve the desired gap. If the clearance has increased due to wear on the bearing (22), only remove the shim (26) and reassemble the disassembled parts.

2) Adjustment of the lower center suspension.

Using a jack, raise the axle housing (19) until the wheels are off the ground. Remove the front wheels. Remove the cap (32). Depending on the gap, use the shim (1) to increase the gap, or use the shim (30) on the front drive side cover (29) to reduce the gap to the desired size. Reinstall all removed parts.

3) Adjusting the axle shaft. Remove the front wheel drive. Remove retaining ring 85 (6). Depending on the gap, using the adjusting washer (5), set the required gap.

Replace all the details.

Then turn the front wheel by hand. It should rotate freely and without extraneous sounds. Fill with lubricating oil to the correct level. Tighten the drain plug. Adjusting the support bearing of the leading bevel gear. (See fig. 6 - 16)

3. Front cardan drive adjustment (Fig. 6 - 18)

The axial clearance of bearings 7208 (2) and 2007107 (5) should be 0.06.- 0.10 mm. Remove the bearing during adjustment. Tighten the adjusting nut (10) firmly and back out 1/30 - 1/50 mm. Tighten the shim (9). Turn the bearing (1) by hand, it should rotate freely.

For center drive bevel gear clearance and bevel clearance adjustments, see part 3.

In the field, especially when working in a wet field, dirt can get on the front and rear brake pads (14), which can lead to surface wear and increased axial clearance. Set the correct axial clearance with the correct shim (11).

Wear on the cardan gear, bearings on the center suspension and bevel gear, and axle shaft bearings can lead to increased gear clearance. Adjust the gear clutch clearance as follows: loosen the drain plug (4) on the lower right side of the drive axle housing (28) to drain the oil.