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The Common Faults Of The Forklift Hydraulic Mechanical Transmission System

- Nov 14, 2018 -

The common faults of the forklift hydraulic mechanical transmission system

Internal-combustion forklift hydraulic mechanical transmission system of common faults mainly include: insufficient output power, start is difficult, slow shift; The oil temperature is too high and hydraulic torque converter does not work.

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; Oil cleanliness is caused by the oil plug, make compensation empty.

If the oil temperature is too high, usually due to: oil blockage caused by insufficient compensation pump oil, the dry friction clutch and cause the oil temperature is too high; Torque converter, the adjustment of the oil pressure is lower than the main pressure valve pressure in the torque converter outlet pressure is too low; The oil brand is wrong; Torque converter internal components damage, power only a small part of the engine is transmitted to turbine, reactive power caused by the excessive oil temperature rise sharply.

If observed from the observation of hydraulic torque converter hole hydraulic torque converter does not work, should first check the hydraulic torque converter of the oil and oil return, without oil, and forklift cold car driving normal and hot car driving is difficult, is the cause of the problem is badly worn or damaged compensation pump; If no power output torque converter, and sometimes work sometimes doesn't work, is the cause of the problem for the inside of the oil plug, idler pulley seat cover or wheel nut loose, etc.

Fault handling

Can be seen from the above analysis, forklift hydraulic mechanical transmission failure of the main oil pump, hydraulic torque converter, and compensation for the three links. Therefore, when troubleshooting, should first consider clean oil, according to the requirement to replace oil and oil filter; Then check that the hydraulic torque converter and compensation pump the three links. Therefore, when troubleshooting, should first consider clean oil, according to the requirement to replace oil and oil filter; Then check that the hydraulic torque converter of the idler pulley, idler pulley block and overrunning clutch is damaged; Final inspection with or without compensation pump wear and repair or replacement of damaged components. Still must clean up the oil radiator surface dust and dirt. After the above processing, the general can troubleshoot.

The following should be paid attention to the designed dynamic system in overhaul, inspection and adjustment; Flywheels, torque converter and engine torque shell coaxiality error should be no greater than 0.2 mm; Connection plate of dynamic unbalance degree should be less than 30 g · cm; The engine flywheel shell end face and end relative to the axis of the torque converter shell side jump movement is not more than 50 um; Torque converter pump gear fork and compensation should be 1.0 1.5 mm gap between end face.


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