32 41 009 Checking Function Of Power Steering Vane Pump

WARNING: This page is about a different car, the 2007 BMW 550i and 2006 BMW 550i. However, it is still accessible from the selected car via links, so may be relevant.

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 Observe country-specific waste-disposal regulations
Remove FRONT UNDERBODY PROTECTION
Disconnect pressure line from vane pump. See REMOVING AND INSTALLING/REPLACING POWER STEERING PUMP FOR POWER STEERING GEAR WITH ACTIVE FRONT STEERING (N62, N62TU) , REMOVING AND INSTALLING/REPLACING POWER STEERING PUMP FOR POWER STEERING GEAR WITH DYNAMIC DRIVE (N62, N62TU) , REMOVING AND INSTALLING/REPLACING VANE PUMP FOR POWER STEERING (N62, N62TU) , and PUMP AND OIL SUPPLY (for torque specs).

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: Removing Suction Line From Fluid Reservoir

Courtesy of BMW OF NORTH AMERICA, INC.

Connecting special tool:

Connect special tool 32 4 000 (refer to NOTES ON USE ) with new sealing rings to vane pump and pressure line.

Connection, vane pump
Connection, power steering gear

Fig 2: Identifying 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
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 .
Replace vane pump if the nominal pressure is exceeded by more than 10 %. See REMOVING AND INSTALLING/REPLACING POWER STEERING PUMP FOR POWER STEERING GEAR WITH ACTIVE FRONT STEERING (N62, N62TU) , REMOVING AND INSTALLING/REPLACING POWER STEERING PUMP FOR POWER STEERING GEAR WITH DYNAMIC DRIVE (N62, N62TU) , or REMOVING AND INSTALLING/REPLACING VANE PUMP FOR POWER STEERING (N62, N62TU) for instructions.

Check belt tension if the nominal pressure is undershot by more than 10 %. Replace vane pump if belt tension is OK. See REMOVING AND INSTALLING/REPLACING POWER STEERING PUMP FOR POWER STEERING GEAR WITH ACTIVE FRONT STEERING (N62, N62TU) , REMOVING AND INSTALLING/REPLACING POWER STEERING PUMP FOR POWER STEERING GEAR WITH DYNAMIC DRIVE (N62, N62TU) , or REMOVING AND INSTALLING/REPLACING VANE PUMP FOR POWER STEERING (N62, N62TU) for instructions.

Fig 3: Identifying Special Tool (32 4 000)

Courtesy of BMW OF NORTH AMERICA, INC.

After installation:

Fill and bleed HYDRAULIC SYSTEM
Check pipe connections for leaks
Version with Dynamic Drive: If necessary, carry out INITIAL DYNAMIC DRIVE OPERATION