23 42 020 Replacing electric motor on hydraulic pump (GS7S47BG SMG)

Necessary preliminary tasks: 

• Remove underbody protection at FRONT and REAR
• Remove REINFORCEMENT PLATE
• Remove complete EXHAUST SYSTEM
• Remove heat shield at front and rear
• Remove TRANSMISSION CROSS-MEMBER
• Remove PROPELLER SHAFT
• Lower transmission

Disconnect connector (1).

Release cable tie (2).

Installation: 

Use high-temperature-resistant cable ties (approx. 140°).

Fig 1: Identifying Connector And Cable Tie

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Release cable tie (1).

Release screw (2).

Tightening torque: 22 Nm

Installation: 

Use high-temperature-resistant cable ties (approx. 140°).

Fig 2: Identifying Cable Tie And Screw

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Unclip oxygen sensor plugs (1).

Release nut (2) and remove holder (3).

Fig 3: Identifying Holder And Oxygen Sensor Plugs

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Unclip return line (1) from holder and place to one side.

Unlock and disconnect plug (2).

Fig 4: Identifying Plug And Return Line

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Release clamp (1).

Carefully detach reservoir in direction of arrow and secure or tie up to transmission with cable tie.

Do not detach return line from reservoir.

Installation: 

Replace clamp.

Replace sealing rings in expansion tank only if damaged.

Fig 5: Identifying Clamp

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Release screws (1) and remove hydraulic pump.

Fig 6: Identifying Screws And Hydraulic Pump

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Installation: 

• Before installing pump, adhere to conditions of absolute cleanliness.
• Align drive shaft (1) of electric motor horizontally
• Check sealing ring (2) for damage. Sealing ring may only be replaced if damaged!

Fig 7: Identifying Sealing Ring

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Installation: 

• Attach greased coupling element (1) from repair kit to oil pump (2) and align horizontally to electric motor drive shaft.
• Attach oil pump to electric motor drive shaft until it can be heard to snap into place.

  Tightening torque: 5 Nm

Fig 8: Identifying Greased Coupling Element

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Release screws (1).

Tightening torque: 22 Nm

Installation: 

Do not replace screws.

Fig 9: Identifying Screws

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Release screws (1).

Tightening torque: 5 Nm

Fig 10: Identifying Bolts

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Installation: 

• Clean inside surface (1) of pump block with paper towel.
• Check O-ring (2) for damage.

  O-ring may only be replaced if it is damaged!

• Coat O-ring (2) with petroleum jelly before installing electric motor

Fig 11: Identifying O-Ring

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Bend open retaining clip (1) a little.

Turn electric motor (2) in direction of arrow, slide towards rear and remove.

Fig 12: Identifying Retaining Clip

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Installation: 

To facilitate installation, coat rubber sleeve on pressure accumulator with petroleum jelly.

Replacement:

Release screws (2) and convert holder (1).

New electric motors are supplied with blind holes and new screws. 

The blind holes have no threads - these are cut by the screws. 

Fig 13: Identifying Mark Holder In Relation To Screws

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After completing work:

• Top up FLUID LEVEL in hydraulic system
• Clear fault memory