Removing, installing, dismantling and assembling shift valve body - RA27037220400X(27-400)

WARNING: This page does not describe the selected car, but rather 42 other vehicles, including the 1999 Mercedes-Benz S600, 1999 Mercedes-Benz S500, 1999 Mercedes-Benz S420, 1999 Mercedes-Benz S320, and 1999 Mercedes-Benz CL600. However, it is still accessible from the selected car via links, so may be relevant.

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

27-5025, 27-5100.

Fig 1: Identifying Shift Valve Body

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

NOTE: Ensure the utmost cleanliness at all times when working on the shift valve body. Work should be performed on a plastic base as far as possible. Fuzzy cloths must not be used; chamois leathers are particularly suitable. After dismantling, all parts must be washed and blown dry with compressed air.

Oil drain plug (4a)	Drain oil, pour in oil after repairs and correct oil level (Maintenance, op. item 2710), 14 Nm (item 1).
Retaining bolts (4)	Unscrew, screw in, 8 Nm. Remove oil pan (3), check gasket (3a).
Oil filter (5)	Remove, mount.
Shift valve body (A)	Remove, install. To do this, unscrew and screw in bolts (7), 8 Nm. Note different bolt lengths.
Shift valve body and damper housing	Range selector valve (A1) must engage in driver (item 5). Dismantle and assemble (items 6-12).

Removing and installing

Unscrew oil drain plug (4a) and allow oil to drain.
Unscrew retaining bolts (4) and remove oil pan (3).
Remove oil filter.

Fig 2: Identifying Oil Drain Plug, Oil Filter, Safety Valve
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Set selector lever to "P".
Unscrew retaining bolts (7) and remove shift valve housing (A).
Installation note

The three bolts (7a) are 50 mm, the others are 55 mm long. Tightening torque 8 Nm.

Fig 3: Identifying Retaining Bolts, Shift Valve Housing
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Ensure that the range selector valve (A1) engages in the driver (arrow).

Fig 4: Identifying Range Selector Valve
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Divide, an assembling
Unscrew bolts (arrows). Remove valves (13, 24, 86) and strainer (33a).
Hold shift valve body (A) and damper housing (B) together and turn over.

Fig 5: Identifying Shift Valve Body, Damper Housing
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Installation note

Only tighten bolts (arrows) slightly so that both housing sections can still be adjusted against each other, as far as the bolts permit.

Insert valves (13, 24, 86) and strainer (33a) in shift valve body.
Carefully lift off damper housing (B) together with intermediate plate (4).

Fig 6: Identifying Lift Off Damper Housing And Intermediate Plate
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Fig 7: Identifying Shift Valve Body Selector Valve, Pressure Valve
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Remove all 18 or 17 valve balls (14). The valve ball marked 14 is located on a tapered spring.
Take out valves, filter and shift pin.
If necessary, unscrew side covers from shift valve body, check plungers and valves for smooth running and swarf.

Fig 8: Exploded View Of Shift Valve Body Assembly (1 Of 2)
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
If necessary, unscrew side covers from shift valve body, check plungers and valves for smooth running and swarf.

Fig 9: Exploded View Of Shift Valve Body Assembly (2 Of 2)
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Installation note

Depending on the model of transmission or vehicle, the springs are installed either in front of or behind the valve. For this reason, the sequence of valves and springs must be noted when dismantling the shift valve housing or the damper housing.
The arrow indicates the location of the hexagon socket screw for the full-throttle control pressure. Rotating the screw clockwise produces earlier full-throttle or kickdown upshifts. The opposite direction delays the upshifts.

Fig 10: Locating Hexagon Socket Screw
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.