Mercedes S-Class W-140

1991-1999 of release

Repair and operation of the car

Mercedes S-Class
+ Mercedes-Benz cars of the class S (W-140)
+ Operation manual
+ Routine maintenance
+ Engine
+ Cooling systems, heating
+ Power supply system and release
+ Engine electric equipment
+ Gear shifting box
- Automatic transmission
   Search of malfunctions - the general information
   - Automatic transmission 722.5
      Removal, check of a state and installation of the converter of rotation (hydrotransformer)
      Removal and installation of the centrifugal regulator
      Removal and installation of the sensor switch of blocking of a starter (permission of start)
      Vacuum knot - installation details
      Removal, service and installation of the secondary pump (AT to No. 3652931)
      Removal and installation of a forward cover with the secondary pump
      Removal and installation of the LB3 piston
      Removal and installation of a back cover of transmission
      Dismantling and assembly of valvate assembly of AT
      Dismantling and assembly of transmission
      Installation and check of a gap in a multidisk brake of B3
      Measurement of a gap in B1 brake
      Coupling of the raising transfer
      Removal, installation and check of components of a brake of BS of the raising transfer and coupling of KS
      Dismantling and assembly of the coupling of a free wheeling
      Dismantling and assembly of planetary mechanisms
      Dismantling and assembly of coupling of K1
      Coupling of K2
      Gear shifting selector lever
   + Automatic transmission 722.6
+ Coupling
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment


Removal and installation of the LB3 piston



1. Remove teflon rings (9) from flutes in a forward cover.
2. Install a stripper (020) on the spring plug (13) and squeeze it until the lock ring (15) is not released.
3. Remove a lock ring (15).
4. Remove a stripper (020).
5. Remove a lock plate (13) and a returnable spring (14) from the LB3 (12) piston.
6. Take the piston.



1. Check radial sealing rings (16) and (17) and, in case of need make their replacement.
2. Establish radial sealing rings (16) and (17).
3. Install the plug (024) on a forward cover (10).
4. Grease the interfaced surfaces of sealing rings.
5. Install the LB3 (12) piston.
6. Remove the plug (024).
7. Fix a returnable spring (14) and the spring plug (13) of the LB3 (12) piston.
8. Establish and fix a stripper (020) on the spring plug.
9. Establish a lock ring (15).
10. Weaken and remove a stripper (020).
11. Establish teflon rings (9) in flutes in a forward cover. Be convinced of correctness and their installations. If it is necessary replace them on same, but smaller diameter.