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: Aluminium screws/bolts must be replaced each time they are released .
Aluminium screws/bolts are permitted with and without color coding (blue).
For reliable identification:
Aluminium 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 ELECTRIC STEERING BOX or ELECTRICAL STEERING BOX (WITH ACTIVE STEERING) .

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

Tightening torque 37 13 7AZ .

Fig 1: Identifying 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.

Tightening torque 32 41 14AZ .

Installation note:

Replace hose clamp (2).

Fig 2: Identifying Plug Connection, Hose Clamp And Screws

Courtesy of BMW OF NORTH AMERICA, INC.

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 aluminium 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 aluminium screws.

Observe screwing sequence.

Fig 4: Identifying Screws

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