Q: the foot brake is not effective
A :
The clearance between the brake drum and the brake shoe is too large and needs to be readjusted; The brake shoe is excessively worn and needs to be replaced; The leather cup of the brake wheel cylinder is damaged and bloated. Replace the leather cup; If the inlet and outlet valve of the brake master cylinder fails, remove the master cylinder for maintenance; If there is air or oil leakage in the braking system, release the air and check the oil leakage; If the free travel of the brake pedal is too large, adjust the travel of the brake pedal; The master cylinder is short of oil, check the oil volume of the auxiliary oil cup; If the vacuum supercharger fails to operate properly, disassemble and inspect the supercharger.
Q: steering failure
A :
The steering gear pull-out pin is broken or deformed and needs to be replaced; The opening of the linkage is damaged and the linkage needs to be replaced; If the two-way safety valve fails, clean the double cylinder safety valve and replace the spring; The sequence priority valve or diverter valve is blocked or stuck, and the sundries at the blockage shall be removed.
Q: heavy steering
A :
If the oil level in the oil tank is too low, add oil to the specified position; If the oil supply of the oil pump is insufficient, check whether the oil pump operates normally; If the oil leakage in the steering cylinder is too large, check the damage of the seal on the piston of the steering cylinder or replace it.
Q: the pump is abnormal or burnt out for a short time
A :
If the working oil is polluted, replace the working oil or clean the filter element; The working oil is mixed with water and air, which needs to be checked.
Q: abnormal heating of oil pump
A :
If the internal parts of the pump are damaged, it is necessary to replace the parts or replace the pump; The fuel tank has small capacity and poor heat dissipation.
Q: the working oil pressure discharged by the oil pump is insufficient
A :
The wear clearance of the side plate of the oil pump is too large, and the oil pump needs to be replaced; The pump body is seriously scratched and needs to be replaced.
Q: the slide valve of multi-way directional valve cannot be reset
A :
The return spring is deformed and needs to be replaced; The valve body and slide valve are not clean and need to be cleaned; The operating mechanism outside the valve is ineffective and needs to be adjusted; The connecting bolts are tightened too tightly to deform the valve body. It is necessary to reconnect the bolts.
Q: the tilt cylinder tilts itself and tilts back and forth, and the piston stroke is not synchronized
A :
The internal leakage of multi-way directional valve is too large, and the slide valve is not in the neutral position, so the return spring needs to be replaced. The oil inlet at both ends of the oil cylinder is blocked and dirt needs to be removed; The stroke of the two piston rods is inconsistent, so the piston stroke needs to be adjusted; The seal on the piston is damaged and needs to be replaced.
Q: large sliding amount of lifting cylinder
A :
Internal leakage of multi-way directional valve; Oil leakage of oil pipeline; The piston sealing ring of lifting cylinder is damaged and needs to be replaced.
Q: forklift cannot lift or cannot lift
A :
Check whether the working oil tank is short of oil; The oil suction pipe is not smooth; The wear clearance of oil pump gear and pump body is large, and the gear pump needs to be replaced; The pressure of the safety valve of the multi-way directional valve is low or there is foreign matter at the conical hole of the safety valve, so it is necessary to adjust the pressure or eliminate the foreign matter; The piston sealing ring of lifting cylinder is damaged and needs to be replaced; Multi way directional valve, overflow valve spring failure, pilot valve wear or damping hole blockage; The valve rod and valve body of multi-way directional valve are excessively worn and leak oil; Oil leakage between multi-way directional valve bodies; There is oil leakage at the hydraulic oil pipeline and joints.
