Level control valve assembly - Removal and installation - RA32001290650X(32-0650)

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.

Preceding operations:

Drain hydraulic system (32-0630) .

Operation no. of operation texts and work units or standard texts and flat rates

32-0800

Fig 1: Identifying Level Control Valve Assembly Remove/Install Components

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Right front wheel	remove, replace, wheel bolts 110 Nm.
Cover on right wheel house	remove, install.
High pressure extending hose (P)	disconnect, connect at steel line, 25 Nm. Collect oil in suitable vessel (No. 3).
Linkage/control rod (54)	detach, reinstall on lever on level controller (6). Replace self-locking hexagon nut, 10 Nm.
Level adjustment non-return valve	remove, install (Position 5 and 7).
Distributor valve (50)	disconnect from distributor (52). Tightening torque 7-9 Nm. When installing, ensure correct seating of the nine O-rings. Always replace O-rings.
Valve unit, level control unit (Y36)	remove from distributor valve (50). Tightening torque 5-7 Nm. Ensure correct seating of the four O-rings, when installing. Always replace O-rings.
Test drive	carry out on uneven road.
Leakage check	perform in the areas in which hydraulic parts have been removed or slackened.

Special tool

Fig 2: Identifying Special Tool (126 589 12 63 00 27 32)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

NOTE: The distributor (52) is only removed in the event of damage as a result of an accident or in the event of visible defects such as hairline cracks or other damage which can lead to the failure of the ADS.

As of 9/90, a 10 mm hexagon bolt was introduced for the pressure supply screw (50a) in the distribution valve (50) (Allen-head bolt on vehicles manufactured up to 8/90).

Fig 3: Identifying Distributor, Pressure Supply Screw, Distribution Valve And Hexagon Bolt

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Removal, installation

Remove right front wheel.
Installation note

Torque lug bolts to 110 Nm.
Unscrew the three hexagon bolts (arrows) and remove the guard (a) in the right-side wheel-housing.

Fig 4: Locating Hexagon Bolts And Guard
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Disconnect the high-pressure expansion hose (P) from the steel hydraulic line (arrow). Use a suitable container to catch the emerging fluid.
Installation note

Before connecting the high pressure extending hose, the tandem pump must be bled (32-0630) .

Tightening torque of high pressure extending hose (P) 25 Nm.

Perform check for leaks in the areas where parts of the hydraulic system have been removed or loosened.

Fig 5: Identifying High-Pressure Expansion Hose And Steel Hydraulic Line
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Detach the control rod (54) from the lever on the level controller (6). Use an open-end wrench to hold the joint pin as required.
Installation note

Replace self-locking nut, 10 Nm.

Fig 6: Identifying Control Rod, Level Controller And Plugs
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Remove the level control non-return valve (Y37) by pulling off the clamp used to retain the valve (refer to Position 8, Item A).
Disconnect the plugs at Y37 and Y38.

USA model
Disconnect the linkage rod (15) from the lever on the level controller (6). Use an open-end wrench to hold the joint pin as required.
Installation note

Renew self-locking nut, 10 Nm.

Fig 7: Identifying Linkage Rod And Level Controller
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Fig 8: Identifying Linkage Rod, Allen Bolts, Distribution Valve, Distributor And O-Rings
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

All models
Remove the Allen bolts (52c). Lift the distribution valve (50) from the distributor (52) and carefully remove it.
Installation note

Always replace O-rings (50d). Clean sealing surfaces before installation. Free oil ports from dirt particles. Ensure correct seating of new O-rings.

Tightening torque 7 - 9 Nm.

Illustration shows valve unit on USA model with sealing plugs

Fig 9: Identifying Valve Unit Components With Sealing Plugs
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Unscrew the bolts (50e). Disconnect the level control control valve (Y36) from the distribution valve (50).
Installation note

Always replace O-rings. Before installing, clean sealing surfaces and free all ports from particles of dirt. Check correct seating of the four O-rings.

Tightening torque 5 - 7 Nm.

Model 129 with level adjustment

Fig 10: Identifying Bolts, Level Control Valve, Distribution Valve And Valve Adjusting Lock Valve Retaining
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Assembly is performed in reverse sequence.