Forklift hydraulic mechanical transmission repair

Forklift hydraulic mechanical transmission system is an important part of the vehicle, some of the internal combustion off road rough terrain forklift after prolonged use, hydraulic mechanical transmission system will be some common faults, for example are: output power shortage, difficulty starting, shifting unresponsive; oil temperature is too high and the torque converter does not work.

Failure Analysis

Found in the course of the

electrical forklift

 underpowered, climbing difficulty, shift unresponsive, and load lifting work, the first detection system pressure gauges are available, if less than the required pressure value may be due to: Compensation pumps gear pump for excessive wear, the compensating pump gear pump for excessive wear, so that the increase in the compensation pump leakage; cleanliness bad oil caused oil plug, make compensation sucked empty.

If the oil temperature is too high, the usual reason is: the oil pump oil blockage caused by inadequate compensation amount, the clutch dry friction caused by high oil temperature; adjust the pressure inside the torque converter oil pressure falls below the main pressure valve, so that converter outlet pressure is too low; oil grades wrong; converter damage to internal components of the engine's power is only rarely passed to the turbine part, reactive power is too large and cause a sharp rise in oil.

If viewed from the observation hole of the torque converter to the torque converter does not work, you should first check the oil return into the oil and torque converter, if not back to the oil, and the truck with normal cold and hot cars travel difficulties, the cause of the failure to compensate pump badly worn or damaged; if the torque converter without power output, while sometimes working without work, the cause of the malfunction is the oil plug, inside idler pulley seat or seat cover is damaged nut loosening.

Troubleshooting

As can be seen from the above analysis, the truck's hydraulic mechanical transmission failure is mainly the oil, torque converter and compensation pump these three aspects. Therefore, the first consideration should be to clean up the oil troubleshooting, replacing the oil and oil filter as required; then check the torque converter and compensation pump these three aspects. Therefore, the first consideration should be to clean up the oil troubleshooting, replacing the oil and oil filter as required; then check the torque converter guide wheel, seat and clutch pulley for damage; and finally check the pump to compensate for wear and repair or replace damaged components. Must clean up the oil radiator surface dust and dirt. Were above treatment, generally better troubleshooting.

In the maintenance of transmission lines, should pay attention to the following checks; engine flywheel, the torque converter and shell concentricity error should be less than 0.2mm; dynamic unbalance lands should be less than 30g · cm; the engine flywheel housing face and converter housing relative to its axis of the end face side beat no more than 50UM; there should be a gap between 1.0-1.5mm converter fork and compensation pump gear end.