Power Steering Pump: Testing and Inspection

Power steering pump delivery pressure, checking





Special tools and equipment required
^ 3094 Hose clamps
^ VAG 1402 Power steering test unit
^ VAG 1402/2 Adapter
^ VAG 1402/3 Adapter
^ VAG 1402/4 Adapter
^ VAG 1402/6 Hose from adapter set

Special tools and equipment required





^ VAS 5024 Assembly pliers





^ VAG 1402/1 Adapter

Vehicles with low mounted power steering pump





- Clamp return hose with hose clamp 3093.
- Remove noise insulation pan.





- Clamp suction hose with hose clamp 3094.
- Place oil pan under vehicle.
- Disconnect pump pressure line.
- Pull connector off pressure switch, if necessary.





- Install adapter -1-.

Use a sealing ring.

1. VAG 1402/1
2. VAG 1402/6 Hose from adapter set





- Connect pressure gauge VAG 1402.

A- Pressure switch only 18 Ltr. gasoline engines

1. VAG 1402 Pressure gauge
2. VAG 1402/6 Hose from adapter set
3. Banjo bolt
4. Pressure hose banjo union
5. VAG 1402/2
6. VAG 1402 Hose from pressure gauge

- Remove hose clamp 3094 from suction and return hoses.
- Re-connect suction and return hoses.
- Start engine and if necessary add fluid to reservoir.
- Turn steering wheel approx.10 times from lock to lock.
- Now check delivery pressure.

Requirements:

^ V-belt/V-belt tension OK.
^ System not leaking.
^ Hoses/lines are not kinked or restricted.
- With engine running at idling speed, close cut-off valve (not longer than 5 seconds) and read off pressure.

Specifications

Gasoline engines: 85 to 95 bar (1233 - 1378 psi)

Diesel engines: 96 to 105 bar (1392 - 1523 psi)

Notes:

^ If the reading is higher or lower than specified replace pump:
^ Removing and installing power steering pump, vehicles with low mounted power steering pump, Refer to Power Steering Pump, Service and Repair.
^ If reservoir fluid level is low then check steering system for leaks.
^ For leaks at the pinion first check the lines/line connections for leaks and if necessary tighten and wipe dry.
^ If the pinion seal or the rack seals in steering transmission housing are leaking then replace steering transmission.
^ To check the rack seals loosen the hose clip on the boot and push boot to one side.

Vehicles with high mounted power steering pump





- Remove engine cover.





- Clamp return hose with hose clamp 3094.





- Clamp suction hose with hose clamp 3094.
- Place oil pan under vehicle.
- Disconnect pump pressure line.

Connecting pressure gauge VAG 1402





1. VAG 1402 Pressure gauge
2. VAG 1402 Hose from pressure gauge
3. VAG 1402/6 Hose from adapter set
4. VAG 1402/4 Adapter
5. O-ring
^ Qty. 2
6. VAG 1402/2 Adapter
7. Pressure line/hose with banjo union
8. Banjo bolt

- Remove hose clamp 3094 from suction and return hoses.
- Start engine and if necessary add fluid to reservoir.
- Turn steering wheel approx.10 times from lock to lock.
- Now check delivery pressure.

Requirements:

^ V-belt/V-belt tension OK.
^ System not leaking.
^ Hoses/lines are not kinked or restricted.

- With engine running at idling speed. Close cutoff valve (not longer than 5 seconds) and read pressure.

Specifications

Gasoline engines: 85 to 95 bar (1233 - 1378 psi)

Diesel engines: 96 to 105 bar (1392 - 1523 psi)

Notes:
^ If the reading is higher or lower than specified replace pump:
^ Removing and installing power steering pump, vehicles with high mounted power steering pump, Refer to Power Steering Pump, Service and Repair.
^ If reservoir fluid level is low then check steering system for leaks.
^ For leaks at the pinion first check the lines/line connections for leaks and if necessary tighten and wipe dry.
^ If the pinion seal or the rack seals in steering transmission housing are leaking then replace steering transmission.
^ To check the rack seals loosen the hose clip on boot and push boot to one side.