2 Steering system troubleshooting
1) Steering force
The problem of steering force usually occurs in the mechanical hydraulic power steering system, but less in the electronic hydraulic power steering and electric power steering system. When this happens, you should first check whether the vehicle is short of oil, whether the steering belt is normal, and whether the air enters the system. Vehicle oil shortage and belt slippage will lead to steering power pump can not work normally; system into the air will be due to its compression principle resulting in the system can not play the role of power. Troubleshooting methods are to refuel and replace the belt, and exhaust air and the system can be restored to normal. If the above is no problem, the steering fault has not been solved, should be in the throttle valve and pressure control valve all open state to measure the vehicle idle static oil pressure, if less than or equal to 1500kPa, the oil pump is no problem. Check whether the oil pipeline between the steering gear and the oil pump is normal. Measure the oil pump unloading pressure at idle speed, if the pressure is low, check whether the oil volume valve is normal. If all of the above are OK, check the steering wheel power, the difference between left and right should not be greater than 2.9N, if it is greater, check the oil cylinder line. If the value is within the allowable range, check whether the rack shaft, rack guide screw, and steering control valve are normal.
2) Vibration when steering angle is maximum
Check whether the power steering is faulty, check the guiding screw adjustment problem, if it is normal, check whether the driving belt is slipping, and replace it in time.
3) Steering jump back
When the vehicle is steering, the steering wheel jumps back. Firstly, measure the pump pressure with the two valves (pressure control valve and throttle valve) closed, if it exceeds 500kPa, check whether the flow control valve is abnormal. The steering oil pump can be replaced to deal with it.
4) Unstable operation and delayed steering
The main manifestation is the dead zone of steering wheel rotation, and the car is unstable when driving in a straight line. Firstly, check the guiding screw and fine-tune it appropriately; secondly, check whether the conveyor belt is abnormal and replace it according to the situation; again, check whether there is a lack of oil and whether air enters inside the system causing the abnormality. And promptly refuel the oil tank to eliminate the air.
5) Abnormal noise of power steering system
It is mainly reflected in the normal driving process of the vehicle steering system’s abnormal noise. Troubleshooting method: Firstly, dismantle the oil pump conveyor belt to observe the situation, if there is still noise, it is determined that the torque converter or oil pump is working abnormally. Secondly, if there is no problem, check whether the noise comes from oil pulsation, which is a normal phenomenon. Finally, check whether the high-pressure hose is frictionally broken, and if it exists, fix it twice or replace it and adjust the position.
6) Oil Leakage
There is oil leakage outside the steering system. First, check the steering system independent oil tank, and check the steering gear, oil pump, oil pipe, and its joints for abnormalities. According to the oil leakage, replace the equipment and tighten it twice to deal with it properly.
7) The power steering system has a trembling sound
First of all, check whether the size of the swing to the shaft, if the problem is replaced in time; secondly, check whether the wire plug is adjusted properly; again, if the trembling sound only appears during the operation of the vehicle, the sound is normal when the steering wheel is turned off. Finally, check whether the cross-tie rod and ball pin are a loose phenomenon, cross-tie rod, and ball pin fixation needs to be checked regularly, if loose, then the second reinforcement or replacement parts.