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Common Failure Of Hydraulic Mechanical Transmission Of Forklift

- Sep 04, 2018 -

The common faults of hydraulic mechanical transmission system of internal combustion forklift mainly include: lack of output power, difficult starting, slow shift reaction; High oil temperature and torque converter not working.

Failure analysis

In use process, such as forklift underpowered, climbing difficulty, slow shift, and load hoisting working normal, first available pressure gauge pressure detection system, if can not meet the prescribed pressure value, the reason may be: compensation gear pump and the pump body excessive wear, make compensation pump gear pump body and excessive wear, make compensation within the pump leakage increases; Poor cleanliness of the oil resulting in road blockage, making compensation vacuum.

If the oil temperature is too high, the usual reasons are as follows: the oil road blockage causes the insufficient oil supply of the compensation pump, and the dry friction of the clutch causes the oil temperature to be too high; The oil pressure in the converter is lower than that of the main pressure valve, which makes the outlet pressure of the converter too low. Wrong grades of oil; The internal components of the converter are damaged, so that only a small part of the engine power is transmitted to the turbine.

If the hydraulic torque converter is not working from the observation hole of the hydraulic torque converter, the oil input and oil return of the hydraulic torque converter should be checked first. If the torque converter has no power output and works or does not work, the fault is caused by oil road blockage, damage of inner sleeve of guide seat or loose of guide seat nut.

Fault handling

It can be seen from the above analysis that the main faults of hydraulic mechanical transmission system of forklift are oil circuit, torque converter and compensation pump. Therefore, when troubleshooting should first consider cleaning the oil road, according to the requirements to replace the oil and filter; Then check the three links of torque converter and compensation pump. Therefore, when troubleshooting should first consider cleaning the oil road, according to the requirements to replace the oil and filter; Then check whether the regulating wheel, regulating wheel seat and overrunning clutch of hydraulic torque converter are damaged. Finally check the compensation pump for wear and repair or replace damaged components. The oil radiator surface must also be cleaned of dust and dirt. After the above treatment, generally can better troubleshoot.

The following inspection and adjustment should be paid attention to when repairing the special moving system; The coaxiality error of engine flywheel, torque converter and torque converter shell should not be greater than 0.2mm. The dynamic unbalance of the connecting disk should be less than 30g·cm; The end face of the engine flywheel shell and the end face of the torque converter shell jump no more than 50UM relative to its axis. There should be a 1.0-1.5mm gap between the torque converter fork and the end face of the compensation pump gear


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