32 41 090 Removing And Installing (Replacing) Hydraulic Pump For Dynamic Drive (N55)

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NOTE: When replacing hydraulic pump:
OIL RESERVOIR must be replaced in event of metal abrasion, sluggish pump shaft or increased dirt contamination!
The filter integrated in the oil reservoir can only absorb a limited amount of foreign particles. If the filter clogs, the hydraulic system can no longer be sufficiently protected.
Metal abrasion is perceived in the oil reservoir as metallically glittering hydraulic fluid.
Replacement of the oil reservoir due to a leak (e.g. at the hose connections) is only required with unavoidable high penetrations of dirt.

WARNING: DANGER OF POISONING if oil is ingested/absorbed through the skin!
DANGER 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.
Seal off hydraulic lines with seal plugs.

IMPORTANT: Aluminum screws/bolts must be replaced each time they are released .
Aluminum screws/bolts are permitted with and without color coding (blue).
For reliable identification:
Aluminum screws/bolts are not magnetic.
Jointing torque and angle of rotation must be observed without fail (risk of damage)!

Necessary preliminary work:

Remove stiffening plate (F12).
REMOVE VANE PUMP BELT PULLEY .
Remove the electrical steering box . See 32 13 070 REMOVING AND INSTALLING ELECTRIC STEERING BOX (EPS) or 32 13 075 REMOVING AND INSTALLING ELECTRICAL STEERING BOX ACTIVE STEERING .

Release line clips (1) and (2) from front axle support.

Tightening torque: 37 13 7AZ .

Fig 1: Line Clips

Courtesy of BMW OF NORTH AMERICA, INC.

Unlock plug connection (1) and disconnect.

Release hose clamp (2) and detach intake pipe from vane pump.

Release screws (3) and remove expandable hose from hydraulic pump.

Tightening torque: 32 41 13AZ .

Release screws (4). Lay holder with expansion hose to one side.

Fig 2: Plug Connection, Hose Clamp And Screws

Courtesy of BMW OF NORTH AMERICA, INC.

Tightening torque: 32 41 14AZ .

Installation note:

Replace hose clamp (2).

Align suction line by way of "P" marking to connection on hydraulic pump.

Make sure hydraulic lines are laid without tension and with sufficient distance to adjoining components.

Release screw (1).

Tightening torque: 32 41 9AZ .

Installation note:

Replace aluminum screws .

Observe screwing sequence!

Fig 3: Identifying Screw

Courtesy of BMW OF NORTH AMERICA, INC.

Release screws (1) and remove hydraulic pump in downward direction.

Tightening torque: 32 41 9AZ

Installation note:

Replace aluminum screws .

Observe screwing sequence.

Fig 4: Screws Of Hydraulic Pump

Courtesy of BMW OF NORTH AMERICA, INC.

Screw-fastening sequence:

Secure hydraulic pump with screws.
Tighten side screw to 2 Nm.
Tighten front screws to 2 Nm.
Tighten down front screws to jointing torque and angle of rotation.
Tightening torque: 32 41 9AZ
Release screw at side and check screw fastening points for gap freedom.
Tighten down side screws to jointing torque and angle of rotation.
Tightening torque: 32 41 9AZ

After installation:

Check line connections for leaks.
If necessary, carry out DYNAMIC DRIVE START-UP .