Clutch is an important component on the tractor essential, it is used to transmit and cut off the engine to pass power transmission and power output device, and prevent the transmission lines and power output device overload damaged parts. Clutch is a driving friction plates and driven by the friction plates to transmit torque generated by frictional force, the size of which depends on the nature of the frictional force the pressing force of the friction plates and friction values of the surface material sheet. But with the increase in the frequency of use or improper use of the clutch transmission will wear occurs, clutch plates will be due to wear and thinning, the clutch master, slave section less friction, so that the clutch transmission torque in the process of shaking , slip, separation is not complete failure, affect the normal use of the vehicle. Thus, the use of the clutch after a period of time must be adjusted according to the needs.
First, the clutch lever height adjustment
Each separate clutch lever must be in contact with the inner end of the release bearing, the vehicle to a smooth start. If the separation of the inner lever ends varies, chattering will occur when the clutch is engaged. Therefore, when assembling the need to maintain separate checking exposure in each lever end bearings, requiring in each end of the release lever located on the same plane, the error should be consistent with the original provisions, generally not more than 0.25mm. If you do not meet the requirements, it should be adjusted. The method of separation is within the adjustment lever end or the outer end of the adjustment screw position.
Of the diaphragm spring clutch, if the diaphragm spring finger separation due to wear, corrosion, resulting in rupture of the diaphragm spring load suffered uneven or lowered, must be updated. Separating diaphragm spring means must be uniformly arranged on the circumference, which limit deviation is less than 0.5mm. At the same time separating the springs refers to the height should be at the same level, the error should be less than 0.5mm, such as spring separator means rugged, will start the vehicle unstable, shaking, the clutch can not be completely separated.
Adjust Second, the clutch pedal free travel
Due to the frequent use of the clutch, so that the clutch control mechanism first requires manipulation of light, in order to reduce the driver's labor intensity. Manipulation of light and of two aspects: first, increasing the force on the clutch pedal should not be too large, usually 196 ~ 245N; the second is the total pedal stroke should be within a suitable range (generally should be 100 ~ 150mm, the maximum does not more than 180mm). If you do not meet the requirements to be adjusted.
Tractor to be checked after every 50-60h clutch pedal free travel, which characterizes the gap release lever and release bearing paw between the faces, free travel in use due to the friction plate wear thin smaller, due to other transmission joints wear increases. If the free stroke disappeared, the clutch in a semi-isolated state, deterioration of performance, release bearing and release lever paw wear and tear, which is to increase the free travel of factors.
Clutch pedal ruler to measure the height available, use a steel ruler arrived in the cab floor, first measure the height of the pedal is fully relaxed, and then hand touch the pedal, when feeling the pressure increases, it indicates that the release bearing end face has with release lever contacts the inner end, stop pushing the pedal, and then measure the pedal height. Height difference between the two measurements, namely free travel pedal. After the measurement pedal free travel should be compared with the technical standards of the model, if not match the requirements should be adjusted. Adjust the pedal free travel, according to the structure is different, the adjustment method is different.
1, mechanically operated clutch pedal free travel adjustments generally adjusting nut to adjust the length of the rod or cable through the release fork lever.
2, hydraulically operated clutch pedal free travel adjustments, usually within the gap release lever and release bearing end clearance between the piston and the master cylinder pushrod between its and reflect on the pedal. Therefore, adjusting the pedal free travel is actually these two gap adjustment. ① between the inner end of the clutch lever and release bearing end face due 2.5mm gap, there are 29 ~ 34mm reflected in the pedal stroke, by changing the length of the cylinder push rod to adjust. When adjusting, first loosen the lock nut, then adjust the length of the putter. Length decreases, the gap increases; length increases, the gap is reduced. After adjustment tighten the lock nut. ② to adjust the master cylinder piston and push rod gap, the gap should be 0.5 ~ 1mm, reflected in the 3 ~ 6mm on the pedal. This gap as inappropriate rotatable eccentric adjustment bolts, check cylinder pushrod stroke, fully depress the clutch pedal, the wheel cylinder pushrod stroke can not be less than 19mm, cylinder pushrod stroke if less than 19mm, should be re-adjusted or deflate, otherwise, it will cause the clutch can not separate.
Third, the clutch hydraulic system of air discharge
Clutch hydraulic control system after maintenance, air may enter the pipeline, when adding brake fluid also allows the hydraulic system into the air. After the air enters, by shortening the master cylinder pushrod stroke of work that is the pedal stroke, so that the clutch is not complete. Thus, the hydraulic system after repair or suspected hydraulic system into the air, it is necessary to exclude air in the hydraulic system. Remedy follows.
1, jacking up the vehicle, and then the car strut bracket. The master cylinder brake fluid reservoir in addition to the required height.
2. Install a hose on the cylinder of the purge valve, received an inside filled with brake fluid reservoir cup.
3, exhaust air needs to work with two people, one person in the cab step on the clutch pedal, the other at the exhaust cylinder.
4, when the pedal is pressed to maintain the pressure, relax exhaust screw; tighten the bleed screw release the clutch pedal. Repeated several times, until the putting out of the brake fluid tubing bubble-free so far.
5, exhaust process, the reservoir cup can not bottomed out, it is constantly adding brake fluid. After the completion of tightening exhaust bleed screws. Reservoir cup filled brake fluid to the cup 10 ~ 15mm.
6, after the air vent clean, we need re-check and adjust the pedal free travel. |
