Single double disc permanently closed clutches

Basic clutch malfunctions

The main causes of clutch malfunctions:

1. Flywheel wear. Cracks, scuffs and other defects may appear on the surface of the device. Grinding can be used for restoration, but it must be carried out taking into account the manufacturer's tolerances. When diagnosing, you should also check the condition of the ring gear of the starter mechanism.
2. Failure of the support bearing. A jammed or jammed part may make it impossible to disengage the clutch. In case of wear, extraneous sounds may appear.
3. Faulty seals. When the parts wear critically, the clutch does not work correctly.
4. Failure of the release mechanism. When replacing the system, this part must also be changed. The release device must slide freely along the guide sleeve. It is also important to always check the correct installation of the latter. The bushing is located parallel to the transmission input shaft.
5. Worn clutch cable. If the problem is a broken product, it is replaced. In case of stretching, adjustment will correct the problem.
6. Oil leak. Lack of lubrication leads to the fact that the unit begins to run dry. Oil is required for processing splines and guide bushings for bearings. It is important that the lubricant contains no solid metal particles. After the splines have been processed, the remaining substance should be removed.

The main thing during repairs is to use original spare parts for the DT 75 tractor, and entrust the restoration procedure to professionals. Low-quality components do not last long, and errors during the replacement process can lead to more serious malfunctions.

Breakdowns and their elimination

When the equipment travels over rough terrain, the trip should be carried out at low speed. Otherwise, during field work, the equipment may stall due to the fact that the gearbox has failed.

Repair of the box installed on the tractor is necessary if:

• there is noise from the side of the box when movement occurs;
• knocking noises are heard (the gears may be worn out);
• difficulty or delay in changing gears;
• increased free play of the lever;
• oil leak.

Both overfilling and underfilling of oil into the transmission helps to reduce the service life of the transmission. The transmission fluid level can be monitored using the oil meter marks.

When changing fuel, it is important that the power plant is warmed up; as a result, the filled fuel will acquire better fluidity. Fuel is drained through a special drain hole, which is closed with a plug.

The drain plug must be cleaned of settled dirt, after which it should be reinstalled. Next, fresh fuel is added. You need to choose a liquid that will maintain its characteristics over a wide temperature range.

The main reason for knocking and noise is wear and tear on the internal elements of the gearbox. Mechanical damage to transmission components is often caused by engine overloads and high temperatures.

Thus, the DT 75 tractor is a common type of agricultural machinery that can move in reverse. There are 7 forward and 1 reverse speeds. The tractor owner must carry out routine diagnostics of the entire DT 75 system. Based on the diagnostic results, a decision is made to replace deformed consumables. The main reason why the amount of oil has decreased is the presence of leaks due to deformed rubber seals.

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Adjusting the clutch yourself

The procedure is performed as follows:

1. The transmission lever is set to the neutral position.
2. The clutch engages.
3. The side of the hood and the stamped hatch cover are removed.
4. The decompressometer turns on. When turning the engine crank handle, use a feeler gauge to check the gap between the thrust bearing thrust device and the end of each release handle. If the clutch is working correctly, the play should be about 3.5–4.5 mm.

If the gap does not correspond to the standardized parameters, the castle nuts of the bolt on the lever are uncoiled. By twisting and unscrewing the required backlash is set.

We eliminate malfunctions in the operation of the control mechanism

The problem of planetary gear brake slippage may be due to the following reasons:

1. Jamming of the ties of the spring elements located in the upper plate. For diagnostics, it is necessary to dismantle the fuel tank and control box. The reasons for jamming can be different; a detailed check of the main elements is required.
2. Shrinkage of springs. In case of such a problem, the only solution is to replace the parts. Shrinkage of the elements may be due to oiling of the brake bands. The mechanical shaft seal should also be diagnosed. If the gasket is worn out, it is replaced with a new one. It is also necessary to check the sealing collar and rubber ring.

If the tractor pulls to the side, you need to diagnose the brake band linings. As a rule, when they fail, they do not adhere tightly to the pulley surfaces. In this case, the parts are replaced with new ones.

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Malfunctions of the DT-75 suspension

Problems in the operation of the suspension that can be encountered when operating equipment:

1. Leaking lubricant from rollers or rollers. The problem may be that the seal is worn out or its housing is loose. If the rubber boot is damaged, the part is replaced. If the wear of the seals is weak, it is enough to wipe the surface of the rings, but if it is critical, they also change.
2. Dirt gets inside the balancer. This is usually due to a leak in the axle. The problem should be found in the wear of the seal.
3. Increased play or malfunction of tapered bearings. It is necessary to check the integrity of the devices located on the road wheels. Worn parts are replaced with new ones.
4. The appearance of cracks on the spokes, as well as wear of the rim of the rollers. If the defect is serious, the unit must be restored by repair and replacement of parts.

Dt 75 clutch all adjustments

Tractor DT-75M. Adjusting the tractor control mechanism

Reliable and durable operation of the tractor transmission largely depends on the correct and timely adjustment of the control mechanism of its units. Due to the fact that in the first 100-200 hours of tractor operation the brake linings and friction clutch discs are intensively worn in, during this period the adjustments of the tractor control mechanism are often disrupted.

Adjustment operations associated with natural wear during operation are described in the section “Operational adjustments of the tractor control mechanism.”

In addition, there is a need to carry out a number of adjustment operations to ensure the correct interaction of individual transmission units and select the length of the control rods after repairing the tractor.

These additional adjustments are described in the “Recommendations for assembling the tractor control mechanism” section.

Tractor DT-75M. Operational adjustment of the tractor control mechanism without a torque multiplier

It should be remembered that the final stage of any adjustment operation is reliable fixation (with locknuts, cotter pins, etc.) of the corresponding adjustment elements. The reliability of operation of individual transmission units and the safety of tractor movement largely depend on this.

Adjust the tractor control mechanism in the following sequence:

1. Check and, if necessary, adjust the main clutch as described in the “Adjusting the Main Clutch” section.

2. Check and, if necessary, adjust the cardan brake (Fig. 90), as indicated in paragraph 6e of the “Main clutch control mechanism” section.

Rice. 90. Tractor DT-75M. Cardan brake adjustment: 1.10 - thrust; 2— emphasis; 3 - lever; 4 - pedal; 5 — drive lever; 6 — release clutch; 7 — cardan brake control lever; 8 — thrust bolt; 9— lever;

It is not recommended to allow gap A, which decreases as the cardan brake lining wears, to be less than 0.5-1 mm.

When using all the threads of the thrust bolt 8, it is allowed to rearrange the lever 7 on the splines of the shaft.

3. Check and, if necessary, adjust the travel of the stopping brake pedals.

The stroke of the right pedal 2 (Fig. 91) is considered to be adjusted correctly if, when it moves from the vertical position to full forward, tooth 4 is installed in the cavity “B” of sector 5 and at the same time the stop brake pulley is tightened with tape. Pedal travel increases as the brake pads wear out.

The pedal stroke should not be allowed to increase to such an extent that tooth 4, with the stopping brake band fully tightened, is not installed in the cavity “A” of sector 5, but moves further forward.

To restore pedal travel, do the following:

a) remove the covers of the two outer adjustment hatches located on the rear wall of the transmission housing;

b) install tooth 4 of the right pedal into cavity “B” of sector 5;

c) tighten nut 11 completely, tightening the brake band

Adjust the travel of the left pedal 1, which does not have a sector, in the same sequence, with the right pedal, the tooth 4 of which is installed in the cavity “B” of sector 5, serving as a guide.

4. Check and, if necessary, adjust the free play of the control levers.

Rice. 91. Tractor DT-75M. Adjusting the travel of the stopping brake pedals and their rods:

1 — left pedal; 2 — right pedal; 3 - lever; 4 — pedal tooth; 5 — sector of the right brake pedal; 6 — fork: 7 — traction; 8 — stopping brake pulley; 9 — brake band; 10 — adjusting screw. 11 — adjusting nut; 12 — brake lever; 13 - thrust

The free play, measured at the ends of levers 2 and 3 (Fig. 92), should be in the range of 80-100 mm.

As the brake linings of the planetary turning mechanisms wear out, the free play of the levers decreases.

Be sure to check the free play of levers 2 and 3 while the tractor is moving and do not allow it to decrease to less than 20 mm.

Adjust the free play of the levers when the belt linings are worn in to the pulley in the following sequence: , *

Reliably and quickly: how to install the clutch disc - instructions

The clutch performs the most important function - it ensures smooth gear shifting, so that the car starts smoothly, the transmission and engine function correctly and do not fail ahead of time.

Due to the fact that the clutch experiences increased loads, it has to be changed quite often, every 100,000 kilometers. How do you know when it's time to install a new clutch disc?

The following signs indicate that this element has become unusable: slippage appears, the clutch does not disengage completely, gears are difficult to shift, the clutch pedal becomes too tight or falls, and the car loses traction.

Not every car owner is well versed in how to properly replace this element. What happens if you install the clutch disc incorrectly? The result of such a repair will be the following: you will have to disassemble the unit again, because the disk will not be able to function properly and will begin to malfunction.

Most often, a new clutch basket is also installed, but there are situations when you can get by with replacing one disc. Although this is generally not a very complicated procedure, many car owners do not know how to properly install the clutch disc. There are 2 methods for performing this operation:

Of course, the second method is much simpler. By the way, if the car is rear-wheel drive, then even a beginner can handle this job. Installing the clutch if the car has front-wheel drive will not be easy, but if you apply the right amount of effort, you can do it yourself. Let's figure out how to install the clutch correctly step by step.

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