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Removing and installing front transmission cover and primary pump - RA27037220630X(27-630)

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Operation number of the operation texts and work units or standard texts and flat rates:

27-5520

Fig 1: Identifying Front Transmission Cover And Primary Pump Components
G04684349Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Front transmission cover (10) Remove, install by unscrewing, screwing in hexagon bolts (18), 13 Nm. Check seal (19) (items 1,2).
Teflon rings (9) Remove, insert, secure in place with grease. Gap in rings must remain closed (item 3).
Snap ring (15) Remove, insert by clamping spring plate (13) with assembly device 201 589 12 43 00 (item 4).
Spring plate (13) and return springs (14) Remove, install (item 5).
Plunger LB3 (12) Pull out, check lip sealing rings (16, 17) and replace if necessary. See installation note in item 6, guide sleeve 126 589 02 14 00.
Primary pump (1-4) Remove, install by slackening hexagon bolts (8), 20 Nm. Take out pump wheels (3 and 4), insert and check. Chamfer on primary pump wheel (4) must face towards bearing bush or radial roller bearing in primary pump housing cover (items 7-9).
Radial sealing ring (6) and O-ring (7) Check and replace if necessary; also check radial roller bearing in primary pump housing cover (items 10 and 11).

Special tools 

Fig 2: Identifying Special Tools (126 589 04 14 00)
G04684350Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Fig 3: Identifying Special Tools (201 589 12 43 00)
G04684351Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
RETURN SPRINGS FOR PLUNGER B3

Transmission Quantity Wire dia. mm Non-compressed length approx. mm.
722.3 20 1,1 29

Removing and installing 

  1. Unscrew hexagon bolts.
  2. Screw two bolts into threaded bores (arrows) and use these to pull out the front cover (10).

    Installation note 

    Clean sealing surface of front transmission cover, check gasket for damage and replace if necessary. The gasket can generally be used several times. It must not be coated with sealing compound.

    Coat bolts with non-hardening sealing compound and tighten to 13 Nm.

    Fig 4: Locating Hexagon Bolts
    G04684352Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
  3. Remove both Teflon rings (9).

    Installation note 

    Insert Teflon rings (9) with grease. Ensure  that the ring gap (arrows) remains closed. If necessary, remove rings again and shape to a smaller diameter.

    Fig 5: Locating Teflon Rings
    G04684353Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
  4. Place assembly device (020) 201 589 12 43 00 on spring seat (13) and compress until snap ring (15) is free. Take out snap ring (15), release assembly device and remove.

    Installation note 

    Place assembly device (020) onto spring seat and compress. Insert snap ring (15). Release assembly device and remove.

    Fig 6: Identifying Place Assembly Device (020)
    G04684354Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
  5. Remove spring seat (13) and return springs (14) for plunger B3.

    Installation note 

    Number of return springs: 20

    Fig 7: Identifying Spring Seat, Return Springs
    G04684355Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
  6. Pull out plunger (12).

    Installation note 

    Check lip sealing rings (16, 17) and replace if necessary. Lip sealings rings must be installed so that the sealing lip points downwards (in direction of arrow).

    Fig 8: Identifying Lip Sealing Rings
    G04684356Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

    Place inserter onto front cover (10). Oil sliding surfaces for lip sealing rings.

    Lubricate lip sealing rings at plunger. Insert plunger (12) in such a way that the lug (on the piston) aligns with the bore (in the front cover). Carefully press plunger downwards without tilting it; if necessary, use a pen to ease the outer lip sealing ring (arrow) into position.

    Remove inserter.

    Fig 9: Identifying Front Cover, Oil Sliding Surfaces For Lip Sealing Rings Components
    G04684357Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

    024 Inserter 126 589 02 14 00

  7. Slacken retaining bolts (8) and remove.
  8. Remove primary pump from front cover.

    Installation note 

    Insert retaining bolts (8) M8 X 32 and tighten to 20 Nm.

    Fig 10: Identifying Slacken Retaining Bolts
    G04684358Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
  9. Remove both pump gears (3, 4) from pump housing.

    Installation note 

    Lubricate both pump gears (3, 4) and place in pump housing. Insert pump gear (4) so that the chamfer (arrow) points towards the radial roller bearing (20).

    Fig 11: Identifying Pump Gear
    G04684359Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

    IMPORTANT

    Check bearing bush (5) or radial roller bearing. If the bearing bush displays running marks or damage, the primary pump must be replaced.

  10. Check radial sealing ring (6) and replace if necessary.
  11. Replace O-ring (7). Insert O-ring into groove so that it is not twisted.
    NOTE: As from 08/91, use of primary pump with reinforced housing.
    Fig 12: Identifying Radial Sealing Ring, Bearing Bush
    G04684360Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
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