Power Steering Pump Flow Control Valve Replacement - Off Vehicle (Hobourn 600 Series)

Power Steering Pump Flow Control Valve Replacement - Off Vehicle (Hobourn 600 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 port.
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 discharge adapter (5).
2. The seal (4).
3. The spring (2) and combination (flow control and relief) valve (3) from the pump housing (1).

Cleaning, Inspection, and Repair Procedure




1. Clean all parts with clean solvent. Blow dry all parts.
2. Inspect the discharge adapter for external damage, damage to the threads and the cross hole on the orifice.
3. If any damage is present, use the discharge adapter kit in order to replace the discharge adapter.
Inspect the following components for excessive burning, scoring, wear or oversize condition:

1. The valve bore
2. The by-pass hole
If there is damage, replace the pump assembly.
3. The flow control valve (3) assembly.
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.
If movement is not free or there is no movement, install a replacement valve kit.

Assembly Procedure

1. Lubricate the valve bore.




2. Lubricate the new seal (4).
3. Assemble the following components:

1. The spring (2) and valve (3) into the valve bore (1).
Check valve for movement.
2. The new seal (4) to the discharge adapter (5).
3. The valve cap (5) to the valve bore.
Tighten the discharge adapter 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 discharge adapter 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).