Inspection of power steering oil pump

Alcohol can only be used to clean all metal components of the power steering pump. Check the flow control valve to ensure that it can slide freely in the pump casing and pump body hole. If it is stuck, check the pump casing and pump body hole of the control valve for impurities, scratches and burrs. The burrs can be removed with fine emery cloth. If the valve, pump casing, or pump body are damaged and cannot be repaired, replace the damaged parts.

The flow control valve can only be repaired as an assembly and cannot be disassembled. When adding hydraulic pressure from inlet 1 of the valve, it should be able to enter smoothly. When blocking a valve hole and pressurizing from the valve hole to the reverse direction of the valve (400 ~ 490kPa), air should not flow out from the valve hole.

Check whether the surface of the front pressure plate and the rear pressure plate are in good contact with the pump ring. When installing, ensure that it is parallel to the pump ring (stator), check all parts for cracks and abrasions, and replace damaged parts. The highly polished surfaces on the front pressure plate, rear pressure plate and pump ring (stator) always have normal friction marks, do not interpret these as abrasions.

Check the pump shaft bushings and bearings and replace if damaged. Press the bearing off the pump shaft and press in the new bearing.

Check whether all the rotor blades can move freely in the rotor slots. The clearance between the blades and the rotor slots is 0.028mm. If it exceeds, the blades should be replaced.

Check end cap snap ring and replace if damaged. If the snap ring is twisted or deformed, it cannot be used anymore.

Inspect casing for wear, cracks, cast holes and damage, replace casing if any of the conditions listed.

Check pressure hose and control valve plug and replace if damaged.

Check the pump shaft spline for wear, the pump shaft for cracks and other damage, replace all excessively worn and damaged parts, and replace the pump shaft snap ring with a new one.