Power Steering Pump Flow Control Valve Replacement - Off Vehicle LG4

Important: 

1. Disconnect the hose connections
2. Remove the pump. Refer to Power Steering Pump Replacement
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.

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

2.1.	The valve plug (9)

2.2.	The O-ring (8)

2.3.	The valve body (7)

2.4.	The retainer spring (6) and the retainer (5)

2.5.	The ball (10) and shims (4)

2.6.	The valve plug (3) and valve spring (2)

1. Clean all parts with clean solvent. Blow dry the parts.
2. Inspect the valve plug (3, 9) for external damage, damage to the threads and the cross hole on the orifice.
3. If any damage is present, replace the necessary parts.

Inspect the following components for excessive burning, scoring, wear or oversize condition:

3.1.	The valve bore

3.2.	The by-pass hole

If there is damage, replace the pump assembly.

3.3.	The flow control valve 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 then install a replacement valve kit.

1. Lubricate the valve bore.



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

3.1.	The valve spring (2) and valve plug (3) into the valve bore

3.2.	The shims (4) and the ball (10)

3.3.	The retainer (5) and the retainer spring (6)

3.4.	The valve body (7)

Check valve for movement.

3.5.	The O-ring (8) and the valve plug (9)

3.6.	Tighten the valve plug finger tight.

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

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

Tighten
Tighten the valve plug to 49 N·m (36 lb ft).

5. Install the pump. Refer to Power Steering Pump Replacement