Power Steering Pump: Testing and Inspection

Power Steering Pump, Checking Delivery Pressure

Special tools, testers and auxiliary items required

• Hose clamps (3094)

• Power steering tester (V.A.G 1402)

• Adapter (V.A.G 1402/2)

• Adapter (V.A.G 1402/3)

• Adapter set (V.A.G 1402/6)

• Torque wrench (V.A.G 1331)

Test Prerequisites

• Ribbed belt/ribbed belt tension OK.

• Sealing of system.

• Hoses/lines are not kinked or constricted.

Checking

Affects Vehicles with Air Suspension

- Place the vehicle on a hoist. Refer to => [ Positioning Vehicle on Hoist and Wheels ] Positioning Vehicle on Hoist and Wheels.

Affects All Vehicles

- Remove engine cover at front - arrows -.






- Drain the coolant.

- Remove the coolant hose - 1 -.






- Remove the coolant hose - 2 -.

- Clamp off suction and return hose using (3094).






- Remove banjo bolt - 2 -. Disconnect pressure hose - 1 - and seals - 5 - from vane pump.






- Install (V.A.G 1402) as shown in illustration.






1. (V.A.G 1402)

2. Hose from adapter set (V.A.G 1402/6)

3. Adapter (V.A.G 1402/3)

4. Seal

5. Power steering pump

6. Banjo bolt

7. Pressurized line

8. Adapter (V.A.G 1402/2)


- Remove the (3094)

- Make sure that lever on pressure gauge stands in position - 2 -.






- Start engine without giving gas.

- Turn the steering wheel from lock to lock about 10 times.

- Switch off engine and, if needed, fill hydraulic fluid in reservoir.

• To avoid damage to pump, observe the following:

• Pressure gauge shut-off valve must not remained closed longer than 10 seconds during this test.

• Start engine without giving gas and run at idle.

• Read the pump pressure immediately after starting at idle speed (have it read by second technician, if necessary).

• Because pressure falls over the course of the test, the highest pressure shown is the decisive measurement.

- Now check delivery pressure.

- Start the engine and close shut-off valve to position - 1 - while engine is idling and read the pressure (the lever must point away from pressure hose). Do not perform measurement longer than 10 seconds.






Specification for Delivery Pressure: 120 to 130 bar

If specification is not obtained, replace pump. Refer to => [ Power Steering Pump ] Power Steering Pump.

- Switch off engine.

- Remove (V.A.G 1402).

- Install the banjo bolt.

- Install the coolant hoses - 1 - and - 2 -.






- Fill with coolant.

- Bleed the steering. Refer to => [ Steering, Bleeding after Replacing ] Steering, Bleeding after Replacing.

- Check power steering fluid level. Refer to => [ Power Steering Fluid, Checking ] Power Steering Fluid, Checking.

- Check the steering for leaks. Refer to => [ Steering System, Checking for Leaks ] Steering System, Checking for Leaks.

- Place vehicle on wheels. Refer to => [ Positioning Vehicle on Hoist and Wheels ] Positioning Vehicle on Hoist and Wheels.