Power Steering Pump Disassemble LG4 with JE3

1. Clean the exterior of the power steering pump with a suitable cleaning solvent that will not damage the rubber components.



2. Remove the following components from the shaft (18):

•	The nut (22)

•	The gear (21) (the gear is a slip fit)

•	The key (19)

3. Remove the pump body bolts (1).
4. Remove the following components from the front cover (12):

•	The pump body (2)

•	The O-rings (10, 11)





Important: The side plate, the ring, and the pressure plate must be assembled in the exact position that they were removed.

5. Mark the following components:

•	The side plate (3)

•	The ring (2)

•	The pressure plate (1)




6. Remove the following components from the ring (6):

•	The pressure plate screws (3)

•	The pressure plate (5)

7. Remove the following components from the ring (6):

•	The side plate (9)

•	The pin (4)

•	The rotor (8)

•	The vanes (7)

8. Remove the snap ring (20) from the front cover (12).




Important: Gently tap with a plastic mallet on the end opposite the drive end in order to remove the shaft from the front cover.

9. Remove the shaft from the front cover.



10. Remove the retainer ring (16) from the shaft (18).
11. Remove the shaft seal (14) from the front cover (12).
12. Remove the O-ring (13) from the front cover (12).



13. Inspect the shaft bearing Refer to Wheel Bearings Diagnosis in Suspension General Diagnosis.
14. If the shaft bearing needs to be replaced, perform the following steps:

•	Remove the snap ring from the shaft

•	Press the shaft bearing off of the shaft

•	Discard the shaft bearing

1. Inspect the bushing for the following conditions:

•

Scores

•

Wear

2. If the bushing shows any of these conditions, the pump body (2) must be replaced.
3. Use a suitable solvent in order to clean all of the parts.

Dry all of the parts.

4. Inspect the vane tips (7) for the following conditions:

•

Wear

•

Damage

5. Inspect the inner surface of the ring (6) for the following conditions:

•

Scoring

•

Wear

•

Damage





Important: The vanes must fit properly in the rotor slots, without sticking or excessive play.

6. Inspect the fit of the vanes in the rotor.
7. Inspect for the following conditions:

•	Burrs in the rotor slots

•	Excessive wear at the thrust faces

8. Replace the rotor, the ring, and all the vanes if any of the following conditions are present:

•	Heavy wear

•

Damage




9. Inspect the side plate (9) for wear at the thrust faces.
10. Replace the side plate (9) if wear is excessive.
11. Inspect the pressure plate (5) for wear at the thrust faces.
12. Replace the pressure plate (5) if wear is excessive.
13. Inspect the shaft bearing (17). Refer to Wheel Bearings Diagnosis in Suspension General Diagnosis.
14. Inspect the shaft (18) for the following conditions:

•

Scoring

•

Damage

Important: Replace the pump body (2) whenever a shaft replacement or bushing replacement is necessary.

15. Replace the shaft (18) if it is necessary.

Important: Lubricate the new shaft bearing with power steering fluid prior to pressing the new shaft bearing onto the shaft.

1. Use an arbor press and a suitable spacer in order to press the new shaft bearing onto the shaft.



2. If the shaft bearing (17) was removed, install the snap ring (15) on the shaft (18).
3. Install the O-ring (13) into the front cover (12).

Important: Lubricate the lips of the new seal (14) with petroleum jelly.

4. Install a new shaft seal (14) into the pump housing (2) using an arbor press and a suitable spacer.
5. Install the retainer ring (16) on the shaft (18).
6. Install the following components into the front cover (12):

•	A new O-ring (13)

•	The bearing shaft assembly

7. Install the snap ring (20) into the front cover (12).

Important: Lubricate the rotor (8), ring (6), and the vanes (7) with power steering fluid prior to assembly.

8. Install the rotor (8) into the ring (6).




Important: Ensure that the rounded edges of the vanes contact the rotor.

9. Install the vanes into the rotor.



10. Align the marks on the following components:

•	The side plate (3)

•

The pins

•	The ring (2)

11. Install the following components on the ring (2):

•	The side plate (3)

•

The pins

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.

12. Install the pressure plate (1) on the ring (2) with screws.

Tighten
Tighten the pressure plate screws to 8 N·m (71 lb in).

13. Install the following components into the pump housing (2):




•	The pressure plate (5)

•	The ring (6)

•	The rotor assembly (7, 8)

14. Install both O-rings (10, 11) into the front cover (12).
15. Install the front cover (12) on the pump housing (2).

Secure the front cover with the pump body bolts (1).

Tighten
Tighten the pump body bolts to 54 N·m (40 lb ft).

16. Install the gear (21) on the shaft (18) using the washer nut (22).

Important: Do not disassemble the pressure relief valve unless the system pressure is incorrect. Refer to Power Steering System Test .

Important: Do not disassemble the pressure relief valve unless it is absolutely necessary. It is difficult to hold the valve body while removing the valve plug. This increases the possibility of damaging the valve body.

1. Secure the pump.
2. Remove the following components from the pump:

•	The plug (9)

•	The O-ring (8)

Notice: Always protect the pressure relief valve body when securing the valve body. Following this instruction can help you avoid damage to the valve body.

3. Remove the following components from the pump housing (1):

•	The valve body (7)

•	The valve spring (2)

4. Secure the valve body (7).

Important: Note the number of shims (4) that are removed from the pressure relief valve.

5. Remove the following components from the valve body (7):

•	The valve retainer (3)

•	The shims (4)

6. Remove the ball (10) from the valve body (7).
7. Remove the following components from the valve body (7):

•	The retainer (5)

•	The spring (6)

1. Install the following components into the valve body (7):

1.1.	The retainer spring (6)

1.2.	The retainer (5)

Important: Be certain to install all of the shims which were removed.

2. Install the shims (4) into the valve body (7).

Notice: Always protect the pressure relief valve body when securing the valve body. Following this instruction can help you avoid damage to the valve body.

3. Secure the valve body (7).

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. Install the valve plug (3)

Tighten
Tighten the valve body plug to 54 N·m (40 lb ft).

5. Install the following components into the pump housing (1):

5.1.	The valve spring (2)

5.2.	The valve body (7)

5.3.	The O-ring (8)

5.4.	The plug (9)

Power Steering Pump Disassemble LG4 with JE4

1. Clean the exterior of the power steering pump with a suitable cleaning solvent that will not damage the rubber components.



2. Remove the following components from the shaft:

•	The nut (11)

•	The gear (2) (the gear is a slip fit)

•	The key (5)

3. Remove the pump body bolts (1).
4. Remove the rear cover (2) and gasket (3) from the pump body (19).
5. Remove the side plate( 12) and ring (5) assembly.
6. Dissemble the following components:

•	The side plate (8)

•	The pins (4)

•	The rotor (7)

•	The vanes (6)

7. Remove the snap ring (13) from the pump body.




Important: Gently tap with a plastic mallet on the end opposite the drive end to remove the shaft from the pump body.

8. Remove the shaft from the pump body.
9. Remove the shaft seal from the pump body.



10. Remove the O-ring from the pump body.

1. Inspect the bushing for the following conditions:

•

Scores

•

Wear

Important: The bushing is not serviced. If the bushing shows abnormal conditions, the rear cover must be replaced (2).

2. Use a suitable solvent in order to clean all of the parts.

Dry all of the parts.

3. Inspect the vane tips (6) for the following conditions:

•

Wear

•

Damage

4. Inspect the inner surface of the ring (5) for the following conditions:

•

Scoring

•

Wear

•

Damage





Important: The vanes must fit properly in the rotor slots, without sticking or excessive play.

5. Inspect the fit of the vanes in the rotor.
6. Inspect for the following conditions:

•	Burrs in the rotor slots

•	Excessive wear at the thrust faces

7. Replace the rotor, the ring, and all the vanes if any of the following conditions are present:

•	Heavy wear

•

Damage




8. Inspect the side plate (8) and rear cover for wear at the thrust faces.
9. Replace the side plate (8) and the rear cover (2) if wear is excessive.
10. Inspect the shaft (16) for the following conditions:

•

Scoring

•

Damage

Important: Replace the rear cover (2) whenever a shaft replacement is necessary.

11. Secure the pump body (19).
12. Remove the connector (20) and the O-ring (21).
13. Remove the valve body (22) and spring (23).



14. Inspect the shaft bearing . Refer to Wheel Bearings Diagnosis .
15. If the shaft or bearing needs to be replaced, perform the following steps:

•	Press the shaft bearing off of the shaft using an arbor press

•	Discard the shaft bearing

Important: Lubricate the new bearing with power steering fluid prior to pressing.

1. Press the new bearing on to the shaft using an arbor press.



2. Install the O-ring (18) into the pump body (19).

Important: Lubricate the lips of the new seal (17) with petroleum jelly.

3. Install a new shaft seal (17) into the pump housing (19) using an arbor press and a suitable spacer.
4. Install the shaft bearing assembly (14, 16) into the pump housing (19).
5. Install the retainer ring (13) into the pump housing (19).

Important: Lubricate the rotor (7), ring (5) and the vanes (6) with power steering fluid prior to assembly.

6. Install the rotor (7) into the ring (5).




Important: Ensure that the rounded edges of the vanes contact the rotor.

7. Install the vanes into the rotor.
8. Install the O-rings into the pump body.



9. Install the following components into the pump housing (19):

9.1.	The side plate (8)

9.2.	The rotor (7)

9.3.	The pins (4)

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.

10. Install the rear cover (2) and gasket (3) to the pump housing (19) with the rear cover bolts (1).

Tighten
Tighten the rear cover bolts to 21 N·m (15 lb ft).

11. Install the valve spring (23) and valve body (22) into the pump housing (19).
12. Install the O-ring (21) and connector (20) into the pump housing (19).

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

13. Install the following components:

13.1.

The key (15)

13.2.

The gear (12)

13.3.

The washer nut (11)

Tighten
Tighten the gear mounting nut to 450 N·m (330 lb ft).