Power Steering Pump Flow Control Valve Replacement - Off Vehicle (Hobourn BB Series)

Power Steering Pump Flow Control Valve Replacement - Off Vehicle (Hobourn BB Series)

Removal Procedure

Important:
* In order to ensure correct reassembly, record or mark all information as specified in the procedure.

* Cap the hose connections.


1. Disconnect the hose connections
2. Remove the pump. Refer to Power Steering Pump Replacement (Hobourn with LG5 and JE4) Power Steering Pump Replacement (Hobourn with LG5 and JE4)Power Steering Pump Replacement (Hobourn with LG5 and JE3) Power Steering Pump Replacement (Hobourn with LG5 and JE3)Power Steering Pump Replacement (Hobourn with LP4 or L21 and JE3) Power Steering Pump Replacement (Hobourn with LP4 or L21 and JE3)Power Steering Pump Replacement (Saginaw with LP4 or L21 and JE3) Power Steering Pump Replacement (Saginaw with LP4 or L21 and JE3)Power Steering Pump Replacement (Saginaw with LP4 or L21 and JE4) Power Steering Pump Replacement (Saginaw with LP4 or L21 and JE4).
3. Clean the exterior of the pump with solvent.
4. Tip the pump in order to drain the oil from the intake tube.
5. Rotate the shaft in order to remove the oil from the internal cavities.

Disassemble Procedure




1. Use the pump mounting bracket or flange in order to clamp the pump assembly to a bench vise.
2. Disassemble the following components:

1. The valve cap (2)
2. The seal (3)
3. The spring (4) and combination (flow control and relief) valve from the bushing cover (1)

Cleaning, Inspection, and Repair Procedure




1. Clean all parts with clean solvent. Blow dry all parts.
2. Inspect the control valve (5) assembly for excessive burning, scoring, wear or oversize condition.
Faulty internal valve components are difficult to visually determine. Low pressure may be a sign for valve replacement. The valve must move smoothly in the valve bore.
Minor polishing of the valve OD with the maximum material removal of 0.002 mm (0.0001 in) is acceptable.

Assembly Procedure

1. Lubricate the valve bore.




2. Lubricate the new seal (3).
3. Assemble the following components:

1. The new seal (3) to the valve cap (2).
2. The valve cap (2) to the valve bore.
Tighten the valve cap finger tight.
Notice: Refer to Fastener Notice in Cautions and Notices.

4. Clamp the pump mounting bracket or flange in a bench vise. Do not distort the sealing surface of the flange mounting.

Tighten the valve cap to 65 Nm (48 lb ft).

5. Install the pump. Refer to Power Steering Pump Replacement (Hobourn with LG5 and JE4) Power Steering Pump Replacement (Hobourn with LG5 and JE4)Power Steering Pump Replacement (Hobourn with LG5 and JE3) Power Steering Pump Replacement (Hobourn with LG5 and JE3)Power Steering Pump Replacement (Hobourn with LP4 or L21 and JE3) Power Steering Pump Replacement (Hobourn with LP4 or L21 and JE3)Power Steering Pump Replacement (Saginaw with LP4 or L21 and JE3) Power Steering Pump Replacement (Saginaw with LP4 or L21 and JE3)Power Steering Pump Replacement (Saginaw with LP4 or L21 and JE4) Power Steering Pump Replacement (Saginaw with LP4 or L21 and JE4).