52 14 899 Additional work (normal/electric) with defective drive for longitudinal adjustment

Set seat tilt adjustment to max. up setting.

Release screw (1) on actuator drive (2) of longitudinal seat adjustment.

Fig 1: Releasing Actuator Drive Screw

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Release screw (1) on servodrive (2) of longitudinal seat adjustment and remove servodrive (2).

Fig 2: Releasing Servodrive Screw

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Activate the operating switch for the seat position adjustment:

(A) No function:

(B) Actuator drive running:

Disassembly Of Faulty Gear (1) For Longitudinal Seat Adjustment:

NOTE: For purposes of clarity, the backrest frame and seat cover are shown removed.

(2) Input shaft

(3) Internal gear

Fig 3: Identifying Seat Adjusting Components (Cover Removed)

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Using a pneumatic saw (1), cut through drive shaft (2) from rear.

Fig 4: Cutting Drive Shaft

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Remove drive shaft (1) from gear (2).

Fig 5: Removing Drive Shaft From Gear

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Release screw (1) and remove gear (2).

Fig 6: Removing Longitudinal Seat Adjustment Drive Screw

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Over rest of drive shaft (1), adjust front seat, release screws on floor panel and remove front seat.

NOTE: If gear (4) is faulty, detach cover (2), release screws (3), and remove gear (4).

Replace seat mechanism on front seat.

Fig 7: Removing Seat

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