How to Correctly Adjust the Tractor Clutch?

The clutch is an indispensable important component on the tractor. It is used to transmit and cut off the power transmitted by the tractor engine to the gearbox and power output device, and to prevent damage to the parts when the drive train and power output device are overloaded.

 

The clutch transmits torque by the friction force generated by the active friction plate and the driven friction plate. The magnitude of the friction force depends on the value of the friction plate pressing force and the nature of the surface material of the friction plate.

 

However, with the increase in the number of uses or improper use, the clutch transmission mechanism will wear out, and the clutch friction plate will also become thinner due to wear, so that the friction force of the main and driven parts of the clutch will be weakened, and the clutch will fail in the process of transmitting torque .

 

Therefore, after the clutch is used for a period of time, it should be adjusted according to the needs, which can effectively reduce the damage of the clutch, increase the use efficiency, extend the use period, and obtain better economic benefits.

 

1. Height adjustment of clutch release lever

 

The inner end of each clutch release lever must be in contact with the release bearing at the same time. If the inner end of the release lever varies, the clutch will shake when it is engaged.

 

Therefore, during tractor assembly and maintenance, it is necessary to check the contact between the inner end of each separating lever and the separating bearing. The inner end of each separating lever is required to be in the same plane, and the error should conform to the original factory regulations, generally not more than 0.25 mm.

 

If it does not meet the requirements, it should be adjusted. The method is to adjust the position of the adjusting screw on the inner or outer end of the separation lever.

 

2. Adjustment of clutch pedal free stroke

 

Because the clutch is frequently used, the clutch operating mechanism requires light handling to reduce the driver's labor intensity.

 

The ease of operation includes two aspects. First, the force applied to the tractor clutch pedal should not be too large, generally it is from 196 to 245 N. Second, the total stroke of the pedal should be within a suitable range. If it does not meet the requirements, it should be adjusted.

 

The clutch pedal height can be measured with a ruler. Use a steel ruler against the cab floor to measure the height when the pedal is fully relaxed. Then press the pedal lightly with your hand. When the tractor pressure increases, it means that the end face of the separation bearing has disconnected the inner end of the lever to stop pushing the pedal. Then measure the height of the pedal.

 

The difference of the two height measured is the free travel of the pedal. After measuring the free travel of the pedal, it should be compared with the technical standards of the model. If it does not meet the requirements, it should be adjusted.

 

3. Discharge of air in clutch hydraulic system

 

After the tractor clutch hydraulic control system is overhauled, air may enter the pipeline and the hydraulic system when brake fluid is added.

 

After the air enters, due to shortening the stroke of the master tractor cylinder push rod. The clutch is not completely disengaged.

 

Therefore, after the hydraulic system is overhauled or when the hydraulic system is suspected of entering the air, the air in the hydraulic system should be eliminated. The elimination method is as follows.

 

(1) Use a jack to lift the vehicle, and then use the bracket to support the vehicle. Increase the brake fluid in the tractor master cylinder reservoir to the specified height.

 

(2) Install a hose on the tractor air release valve of the working cylinder and connect it to a reservoir cup containing brake fluid.

 

(3) Two people are required to work together to exhaust air. One person depresses the clutch pedal in the cab, and the other person exhausts air at the cylinder of the tractor.

 

(4) While pressing the pedal to maintain pressure, loosen the vent screw. Tighten the vent screw and release the clutch pedal. Repeat several times until there is no air bubble in the brake fluid flowing out of the oil drain pipe.

 

(5) During the venting process, the reservoir cup cannot bottom out and brake fluid must be added continuously. After exhausting, tighten the bleed screw.

 

(6) After the air is removed, the free stroke of the pedal needs to be checked and adjusted again.