Check the flow control valve for wear, burrs, and other damage to the edges of the grooves in the valve. Inspect the bore of the flow control valve on the pump housing for scratches and wear.
Slip the flow control valve back in the pump housing, and check that it moves in and out smoothly. If OK, go to step 14, if not, replace the pump as an assembly. The flow control valve (A) is not available separately.
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Attach a hose (A) to the end of the flow control valve (B) as shown.
Then submerge the flow control valve in a container of power steering
fluid (C), and apply compressed air in the hose.
If air bubbles leak through the valve at less than 98 kPa (1.00 kgf/cm2, 14.2 psi), replace the pump as an assembly. The flow control valve is not available separately. If the flow control valve is OK, set it aside for reassembly later.
Inspect the ball bearing by rotating the outer race slowly. If
you feel any play (axial or radial) or roughness, remove the faulty ball
bearing (A), and install a new ball bearing (B). Inspect the driveshaft by rotating the inner race slowly. If you
feel any play (axial or radial), remove the worn driveshaft (C), and
install a new driveshaft (D).
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