Power Steering Pump: Testing and Inspection

P/S Pump Inspection
Pump Body, Cover, Side Plate and Shaft





Check sliding surfaces of each part for wear and damage. If any defect is found, replace pump assembly.

Cam Ring





Check vane sliding surface of cam ring for wear and damage. If any defect is found, replace pump assembly.

Rotor and Vane





^ Check sliding surfaces of rotor and vane for wear and damage.





^ Check clearance between rotor and vane.
Clearance
Standard: 0.01 mm (0.0004 inch)
Limit: 0.06 mm (0.0023 inch)
Replace pump assembly if any defect is found in the checks.

Relief Valve (Flow Control Valve) and Its Spring





^ Check fluid passage of relief valve and orifice of connector for obstruction (clogged).





^ Check sliding surface of relief valve for wear and damage.
^ Check free length of relief valve spring (1).
Free length
Standard: 22.0 mm (0.866 inch)
Limit: 19.0 mm (0.748 inch)
Replace if any defective is found.