Delivery Pressure of Power Steering Pump, Checking

Delivery pressure of power steering pump, checking

Vehicles with 8-cyl. engine
Special tools and equipment





^ 3094 Hose clamps
^ V.A.G 1402 Tester for power steering
^ V.A.G 1402/2 Adapter
^ V.A.G 1402/6 Hose of adapter set





^ V.A.G 1402/4 Adapter





^ Disconnect suction and return lines with hose clamps -3094-.
^ Remove banjo bolt -arrow-.





Install V.A.G adapters as shown in illustration.
1. V.A.G 1402 Pressure gauge
2. V.A.G 1402/2
3. V.A.G 1402/4
4. V.A.G 1402/6 Hose from adapter set
5. Banjo bolt
6. Sealing ring
Remove hose clamps -3094-.





Make sure that the lever on the pressure gauge is in position -2-.
^ Start engine and top off hydraulic fluid level in reservoir if necessary.
^ Turn steering wheel approximately 10 times from stop to stop.

Test requirements:
^ Ribbed V-belt ribbed V-belt tension OK
^ No system leakage
^ Hoses/lines neither kinked nor trapped
^ Now check pumping pressure





^ Close cut-off valve (Item -1-) with engine idling and take pressure reading.

Note: To avoid damaging the pump, note the following:
^ The pressure gauge's cut-off valve must not remain closed for more than 10 seconds when carrying out this test.
^ Start the engine without pressing the accelerator and let it run at idling speed.
^ Read off the pump pressure at idling speed immediately after starting the engine (if necessary, have a second mechanic read off the pressure).
^ The pressure will drop during the test; take the highest pressure reading as the test value

^ Start engine and top off fluid level in reservoir if necessary.
^ Take pressure reading from pressure gauge at idling speed (measurement not longer than 10 seconds).

Specified value of delivery pressure: 125 - 130 bar

Note: Replace vane pump if specified value is not attained

^ Stop engine.
^ Remove pressure gauge.
^ Connect pressure line to power steering pump with banjo bolt.