A gear of the loader is walking weakly or not, other gears are normal.
The main point of judgment: when not walking or walking slowly, the main drive shaft rotates quickly and forcefully. When the engine speed is increased, the speed of the main drive shaft is significantly disproportionate to the front and rear drive shafts. The oil pressure of the neutral and other gears is normal, and the pressure drops significantly after the gear is engaged.
Reasons for the fault: 1) The bearing cover or nylon ring is severely worn, 2) If the bearing cover or nylon ring is good or the wear is slight, the seal ring on the surface of the clutch is admitted to be poor.
Removal method: replace the corresponding damaged parts, that is, the bearing cover or the nylon ring, the front and back sealing ring, and adjust the gap between the shaft sleeve and the bearing cover from the beginning.
Fault analysis: a certain gear can't walk or can't walk, it can clear the problems of torque converter, walking pump, pressure relief valve and other common oil circuits and components. The location of the fault can only be reached after the speed control valve. The oil path between the clutch pistons. After thin parts such as bearing caps, nylon rings, and front and back seal rings wear out, the oil supplied to the clutch piston cavity leaks from the worn parts, resulting in a drop in oil pressure. In the neutral gear or other gears, the oil pressure is normal because the oil does not flow through the worn parts.
2. The gear will automatically move forward, and the gear can be moved normally when the gear is engaged. When the gear is engaged in the retreat gear, the machine stops and cannot walk. The operating pressure of each gear is normal.
Causes of faults: sintering and locking of the main clutch and follower of the traveling clutch; piston of the traveling clutch stuck and the check valve of the support blocked
Removal method: disassemble the traveling clutch, clean the oil passage, replace the main and driven friction plates and related damaged parts, clean the related parts, replace the outer seal ring, clean the unblocking valve, replace the clutch friction plate, and the front and back seal rings.
3. During the normal running of the whole machine, after the second gear is engaged, it suddenly does not work. Check that the working pressure of this gear and other gears is normal.
Cause: The clutch shaft of this block is broken
Removal method: replace clutch shaft, readjust bearing clearance
4. The whole machine travels suddenly and without retreat, the pressure of variable speed operation is normal.
Reasons for the fault: 1). Faulty transmission valve or (40F, 50D, 50F) accumulator damaged. The gas control valve stem of the transmission valve is stuck or damaged, 2) the oil inlet is blocked, 3) the oil passage of the accumulator is blocked , 4) Air control globe valve fails
Removal method: clean the isolation valve stem of the speed change valve or replace the air control valve to clear the relevant oil circuit, repair or replace the air control stop valve
5. Normal operation of the whole machine, if there is no steering, no lifting, no walking, the elastic coupling plate is damaged or the coupling wheel is toothed
The cause of the fault: the elastic connecting plate is disassembled, the fixing bolt of the elastic connecting plate is damaged, and the connecting wheel is toothed
Sweeping method: replace the elastic connecting plate, replace the connecting wheel
6. The pressure of variable speed operation is normal, and the main drive shaft rotates fast and powerful when the whole machine encounters a heavy load. And the whole machine can not work normally during shoveling operation and there is metallurgical powder in the transmission fluid
Cause: The bump speed control lever is not reversing at the low speed position or the shift valve is not in place, the 1: 3 clutch is damaged, and the traveling clutch is damaged
Sweeping method: hang the bump speed rod to the low speed position, adjust the pull bacillus from the beginning, replace the clutch friction plate and damage related parts
7. Blowing oil at the top of the torque converter
Causes of the fault: the valve stem of the air valve of the transmission valve is “O”, air leakage, the oil return filter of the torque converter is blocked, the internal oil path of the torque converter or the oil path of the guide wheel seat is blocked, and the oil return line from the torque converter to the transmission Block
Removal method: replace the "O" ring of the air control valve, clean the oil return filter element or replace the filter element, clean the oil circuit or replace the guide wheel seat, clean or replace the oil pipe
8. The converter has abnormal noise
Fault reason: Torque converter coupling teeth are damaged or rubber teeth are damaged, the elastic coupling plate of the torque converter is split, the main and damaged shafts of the 30F and 30D torque converters are damaged, the spline of the main drive shaft does not correspond to the universal joint Large bearing clearance
Removal method: replace the connecting wheel or rubber teeth, replace the elastic connecting plate, replace the main and forced gears or bearings, adjust or adjust the gap from the beginning
9. The operation of the whole machine is normal, the oil temperature is high, the output power is insufficient, and there is aluminum foam in the transmission fluid
The cause of the problem: clogged oil return filter, clogged mechanical oil radiator, poor oil return line, damaged bearings, and three-wheel wear of the torque converter
Removal method: clean the filter element or replace the filter element, replace the radiator, clean and dredge the oil channels or replace, replace the bearing, replace the three wheels and adjust the gap
10. Low speed or high speed out of gear
The cause of the problem: the gap of the operating part is too large or the tie rod is not adjusted properly, the sliding sleeve and the concave and convex speed gear are worn, the amount of meshing is too small, and the concave and convex speed gear
