32 41 009 Checking function of power steering vane pump

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Special tools required:

32 4 000 . See STEERING & WHEEL ALIGNMENT - SPECIAL TOOLS .

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.

After installation:

Fill and bleed hydraulic system . See 32 13 006 Bleeding power steering (version with Dynamic Drive) or 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 . See 37 10 001 INITIAL OPERATION WITH TEST RUN OF DYNAMIC DRIVE .

Necessary preliminary tasks:

Draw off and dispose off hydraulic fluid from fluid reservoir
Observe country-specific waste-disposal regulations
Remove front assembly underside protection . See 51 47 490 REMOVING AND INSTALLING / REPLACING FRONT UNDERBODY PROTECTION .
Disconnect pressure line from vane pump

Version with Dynamic Drive only: . See 37 10 001 INITIAL OPERATION WITH TEST RUN OF DYNAMIC DRIVE .

NOTE:

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

Fig 1: Identifying Pressure Lines And Suction Line
Courtesy of BMW OF NORTH AMERICA, INC.

Connecting special tool:

Connect special tool 32 4 000 .

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 . See 32 13 006 Bleeding power steering (version with Dynamic Drive) or 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.

Fig 3: Checking Pump Pressure
Courtesy of BMW OF NORTH AMERICA, INC.

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.