Checking delivery pressure of power steering pump (vehicles with 4-cylinder diesel engine, vehicles with and without dynamic ste
Checking delivery pressure of power steering pump (vehicles with 4-cylinder diesel engine, vehicles with and without dynamic steering)
Checking delivery pressure of power steering pump (vehicles with 4-cylinder diesel engine, vehicles with and without dynamic steering)
Special tools and workshop equipment required
t
Hose clamps up to 25 mm Ø -3094-
t
Torque wrench -V.A.G 1331-
t
Power steering tester -V.A.G 1402-
t
Adapter -V.A.G 1402/3-
t
Adapter set -V.A.G 1402/6-
t
Drip tray for workshop hoist -VAS 6208-
Test requirements:
l
V-belt and V-belt tension OK.
l
No leaks in system
l
Hoses and pipes not kinked or constricted
Checking
–
Clamp off suction hose -1- and return hose -2- using hose clamps -3094-.
Caution
l
Hose clamps up to Ø 25 mm -3094- must not be applied at any point near the non-return valve in the return hose -2-. The non-return valve will otherwise be damaged.
l
The non-return valve is located in the return hose -2- between the hose clips -arrows-.
Attach tester -3- by a hook -2- to track control link -1-.
–
Place drip tray for workshop hoist -VAS 6208- underneath to collect hydraulic fluid.
–
Slacken union nut -5-. Counterhold at hexagon flats.
–
Remove nut -3-.
–
Connect power steering tester -V.A.G 1402- as shown.
1 -
Pressure line with connecting point
2 -
Hose from adapter set -V.A.G 1402/6-
3 -
Pressure gauge -V.A.G 1402-
4 -
Hose from adapter set -V.A.G 1402/6-
5 -
Adapter -V.A.G 1402/3-
–
Screw hoses from power steering tester -V.A.G 1402- onto open lines of pressure hose at connecting point, as shown in illustration.
–
Make sure lever on pressure gauge is at position -2-.
–
Lower vehicle.
–
Remove hose clamps -3094-.
–
Start engine but do not press accelerator.
–
Turn steering wheel approx. 10 times from lock to lock.
–
Switch off engine and top up hydraulic fluid in reservoir if necessary.
Note
t
To avoid damaging the power steering pump, please note the following points:
t
Cut-off valve of pressure gauge must not remain closed for more than 10 seconds during this test.
t
Start engine without pressing accelerator and leave it running at idling speed.
t
Take pump pressure reading at idling speed immediately after starting engine (have second mechanic take reading).
t
The pressure will drop during the test; the highest pressure reading is therefore the required test value.
–
Then check delivery pressure.
–
Start engine.
–
Raise the vehicle.
–
With engine idling, close cut-off valve (position -1-) and read off pressure (lever must face away from pressure hose). Do not perform measurement for longer than 10 seconds.
Specification for delivery pressure (vehicles with and without dynamic steering): 110…130 bar