The steering wheel of the roller sometimes fails, some steering is difficult, the weather is cold, the hydraulic oil is not working, or what are the reasons?

Troubleshooting of hydraulic power steering: Check whether the whole hydraulic steering system pipeline is blocked. Hydraulic pipeline fault is a hidden and difficult fault in steering system. If the pipeline is completely blocked, its failure is easier to deal with. Sometimes the pipeline is partially blocked, and the pressure generated by the booster pump is insufficient, resulting in heavy direction. This failure is mainly caused by impurities in the oil and the aging and expansion of the hose, so the hydraulic pipeline must be replaced regularly. Take precautions first and deal with them in time. Fault diagnosis and elimination of steering pump and steering gear. If there is no fault in the mechanical part and hydraulic pipeline, you can find a good quality steering booster pump and put it on the car for testing. Turn left and right after starting the car. If the steering is normal, the original booster pump is faulty. If the direction is still heavy after replacing the booster pump, the direction booster can be removed and corrected on the calibration table to check its failure. The unit without calibration platform can be replaced with a new directional booster, or the non-faulty directional booster can be tested on the vehicle to determine whether the original directional booster is faulty. The main reasons of steering wheel failure and difficulty in aligning are that the control valve of hydraulic power system is not adjusted correctly, and the hydraulic valve is stuck or dirty. Check one by one. It may be that the hydraulic valve is improperly assembled, there is air on one side of the booster cylinder, and the pressure limiting valve leaks oil or unloads prematurely. Troubleshooting methods include: bearing tightness, air in the cylinder, and check the hydraulic valve and piston if necessary.