How to Find Fault of Forklift Steering System?

(1) Fault phenomenon

During the operation or operation of the forklift, when steering the steering wheel to implement steering, the steering wheel feels heavy or it is difficult to turn the steering wheel.

(2) Cause of failure

① The oil in the steering tank is insufficient or the oil is deteriorated, the viscosity of the oil does not meet the requirements or the grade of the oil does not match.

② The oil supply of the oil pump is insufficient (that is, the oil pump is faulty) or there is air in the steering system.

③ The one-way solenoid valve in the valve body fails (may be not closed tightly or issued a card).

④ There is too much leakage in the steering cylinder.

⑤ The pressure of the relief valve in the valve block is lower than the working pressure.

⑥ The pipeline is broken (the joint is loose) or blocked.

⑦ Steering transmission mechanism failure (such as tire lack of air, poor lubrication and deformation of body frame and axle, etc.).

(3) Fault diagnosis and elimination

The full hydraulic valve steering system is very light and flexible when it is working normally.

When heavy, it is mainly a result of the fluid in the system not being supplied as required by the job (i.e. insufficient oil supply), or the steering

The mechanical part of the mechanism has problems and other reasons.

1) Reasons and troubleshooting methods for insufficient oil supply in the system

Insufficient oil supply in the system is mainly caused by insufficient oil absorption, and various reasons and solutions for insufficient oil absorption are as follows.

① Insufficient oil in the oil tank causes the oil pump to not suck up oil. Check the oil tank level and add enough hydraulic oil.

② The viscosity of the oil is too high, the hydraulic oil grade is not suitable or the ambient temperature is too low, which makes it difficult for the oil pump to absorb oil. Please replace the appropriate oil and take measures to increase the temperature of the hydraulic oil.

③ The blockage of the filter causes the oil pump to be unable to absorb oil or the oil circulation is not smooth. The filter element should be cleaned or replaced.

④ The inner holes of the oil inlet and outlet pipes are blocked, which makes the oil pump difficult to absorb oil or unable to absorb oil. Should be cleaned and unclogged.

⑤ There is air in the circuit, which causes the oil pump to suck empty. Air in the circuit should be excluded.

⑥ The pipe joint is loose and the oil leaks, which makes it difficult to absorb oil or can not absorb oil. The oil pipe joint should be tightened to ensure a good seal.

2) Oil pump failure

① The oil pump is excessively worn and the internal leakage is serious. Disassemble the oil pump, check the working condition, repair or replace the oil pump.

② The drive part of the oil pump is faulty. The drive belt is slipping or the drive gear (key) is worn. Check the moving part of the oil pump, adjust the belt tension appropriately, and repair or replace the drive gear (key).

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