32 41 009 Checking Function Of Power Steering Vane Pump

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NOTE:

For Special Tool identification, see STEERING AND WHEEL ALIGNMENT - SPECIAL TOOLS .

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

Adhere to the utmost cleanliness. Do not allow any dirt to enter the hydraulic system.

Recycling:

Catch and dispose of hydraulic fluid in a suitable container.

Observe country-specific waste-disposal regulations

Necessary Preliminary Tasks:

Draw off and dispose off hydraulic fluid from fluid reservoir.
Remove front assembly underside protection. Refer to 51 47 490 REMOVING AND INSTALLING/REPLACING FRONT UNDERBODY PROTECTION .
Disconnect pressure line from vane pump. Refer to 32 41 037 REMOVING AND INSTALLING POWER STEERING PUMP FOR POWER STEERING GEAR WITH DYNAMIC DRIVE (N73) and STEERING AND WHEEL ALIGNMENT - TIGHTENING TORQUES .

Version With Dynamic Drive Only:

NOTE:

Pressure line to valve block (Dynamic Drive).
Pressure line to power steering gear.
Suction line from fluid reservoir.

Fig 1: Pressure Lines, Suction Line And Power Steering Fluid Flow Directions
Courtesy of BMW OF NORTH AMERICA, INC.

Connecting Special Tool:

Connect special tool 32 4 000 (refer to 32 41... INSTRUCTIONS FOR USING SPECIAL TOOL 32 4 000 ) with new sealing rings to vane pump and pressure line.

Connection, vane pump
Connection, power steering gear

Fig 2: Vamp Pump Connection, Steering Pump Connection And Special Tool (32 4 000)

Courtesy of BMW OF NORTH AMERICA, INC.

Checking pump pressure:

Close valve (A).
Open valve (B).
Fill and bleed hydraulic system. Refer to 32 13 006 BLEEDING POWER STEERING UNIT .
Start engine.
Heat hydraulic fluid to approx. 50° C by moving steering wheel at increased engine speed.
Close valve (B) for max. 10 secs. and read off pressure.
Compare measured pressure with specified nominal pressure. Refer to STEERING AND WHEEL ALIGNMENT - TECHNICAL DATA .
Replace vane pump if the nominal pressure is exceeded by more than 10 %. Refer to 32 41 037 REMOVING AND INSTALLING POWER STEERING PUMP FOR POWER STEERING GEAR WITH DYNAMIC DRIVE (N73) .

Check belt tension if the nominal pressure is undershot by more than 10 %. Replace vane pump if belt tension is OK. Refer to 32 41 037 REMOVING AND INSTALLING POWER STEERING PUMP FOR POWER STEERING GEAR WITH DYNAMIC DRIVE (N73) .

Fig 3: Pressure Tester Valves And Special Tool (32 4 000)
Courtesy of BMW OF NORTH AMERICA, INC.

After installation:

Fill and bleed hydraulic system. Refer to 32 13 006 BLEEDING POWER STEERING UNIT .
Check pipe connections for leaks
Version with Dynamic Drive: If necessary, carry out initial operation for Dynamic Drive. Refer to 37 10 001 INITIAL OPERATION WITH TEST RUN OF DYNAMIC DRIVE .