BMW X5: Checking Function Of Power Steering Vane Pump

Special tools required:

• 32 4 000

WARNING: Danger of poisoning if oil is ingested/absorbed through the skin! Risk of injury if oil comes into contact with eyes and skin! IMPORTANT: Adhere to the utmost cleanliness. Do not allow any dirt to enter the hydraulic system.

Prior to this check, first check all hose connections, the vane pump and the power steering gear for leaks.

Necessary preliminary tasks:

• Draw off and dispose of hydraulic fluid from fluid reservoir.
• Remove front assembly underside protection.
• Disconnect pressure line from vane pump.

Connecting special tool:

Connect special tool 32 4 000 with new sealing rings to vane pump and pressure line.

1. Connection, vane pump
2. Connection, power steering gear

Fig. 85: Identifying Special Tool (32 4 000)

Checking pump pressure:

1. Close valve (A).
2. Open valve (B).
3. Fill and bleed hydraulic system.
4. Start engine
5. Heat hydraulic fluid to approx. 50ºC by moving steering wheel at increased engine speed.
6. Close valve (B) for max. 10 secs. and read off pressure.
7. Compare measured pressure with specified nominal pressure.

Fig. 86: Identifying Special Tool (32 4 000)

Replace vane pump if the nominal pressure is exceeded by more than 10 %.

Check belt tension if the nominal pressure is undershot by more than 10 %. Replace vane pump if belt tension is OK.

After installation:

• Fill and bleed hydraulic system.
• Check pipe connections for leaks.

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