Rear pressure accumulator - Removal and installation - RA32001290620X(32-0620)

Preceding operations:

Drain hydraulic system (32-0630) .

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

32-0820

1. Model 129 
   Fig 1: Identifying Rear Pressure Accumulator Remove/Install Components

   Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

   Spare tire cover	remove, install.
   Spare tire	remove, install.
   Vehicle	raise, lower.
   Crossmember	left pressure accumulator only: detach, remount on floorpan, replace self-locking bolts, 120 Nm (Position 4).
   Rear muffler	remove from mount, reconnect (Position 5).
   High-pressure lines (S1 and P4)	use an open box-end pipe wrench 116 589 00 17 00 to detach, reconnect at pressure accumulator (4). S1 = 14 Nm. P4 = 30 Nm.
   Self-locking hexagon nuts	unscrew, replace, install, 10 Nm.

   Special tool 

   Fig 2: Identifying Special Tools (116 589 00 17 00 32)

   Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
   NOTE: If either of the pressure accumulators is defective, replace both units on the axle.

   Removal, installation 

   1. Remove cover of spare wheel in luggage compartment.
   2. Remove spare wheel.
   3. Raise vehicle.
      Fig 3: Locating Spare Wheel Cover

      Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

      Left-hand accumulator only 

   4. Unscrew self-locking bolt (69b) and remove cross strut (69).

      Installation notes 

      Replace self-locking bolt (69b), 120 Nm.

   5. Detach the rear muffler from its mount, suspend with a hook to prevent it from falling.
      Fig 4: Identifying Self-Locking Bolt And Cross Strut

      Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

      Both accumulators 

   6. Disconnect pressure line (S1 and P4) at accumulator (4).

      Installation note 

      Tightening torques:

      S1 = 14 Nm

      P4 = 30 Nm

      Fig 5: Identifying Pressure Line And Accumulator

      Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
   7. Unscrew three self-locking nuts (4f) and remove accumulator (4).

      Installation notes 

      Replace self-locking hexagon nuts, 10 Nm.

      Fig 6: Identifying Self-Locking Nuts And Accumulator

      Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

      Disposal information 

      Always observe all applicable safety precautions when disposing of used pressure accumulators. To release the gas pressure, carefully drill into the arched side with a 3 mm bit until gas starts to emerge. Always wear safety glasses and gloves for protection against metal chips and emerging gas. Apply only minimal pressure while drilling, and do not allow the bit to penetrate any further into the bore hole (arrow) than absolutely necessary.

      Fig 7: Locating Bore Hole

      Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
   8. Install in reverse sequence.
2. Model 140 
   Fig 8: Identifying Rear Pressure Accumulator Remove/Install Components

   Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

   Exhaust system	remove, install at the mountings on the vehicle floor and secure with a hook. (Position 1).
   Pressure lines (S1, P4)	disconnect, connect, using a line wrench 116 589 00 17 00. Ensure correct routing. M10X1 = 14 Nm. M16X1.5 = 30 Nm.
   Self-locking hexagon nut (4f)	unscrew, replace, install, 10 Nm.
   Accumulator (4)	note information on scrapping. (Position 4).

   Special tool 

   Fig 9: Identifying Special Tools (116 589 00 17 00 32)

   Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
   NOTE: If either of the pressure accumulators is defective, replace both units on the axle.

   Removal, installation 

   Left pressure accumulator only 

   1. Remove the exhaust pipe from its mountings on the floorpan, securing with a hook to prevent it from falling.

      Both accumulators 

   2. Use line wrench to disconnect pressure lines (S1 and P4) at accumulator (4).
   3. Seal pressure lines and connections on accumulator with suitable plugs.

      Installation note 

      Tightening torques:

      M10X1 = 14 Nm.

      M16X1.5 =30 Nm.

      Right-hand rear accumulator

      Fig 10: Identifying Right-Hand Rear Accumulator

      Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

   Left-hand rear accumulator

   Fig 11: Identifying Left-Hand Rear Accumulator

   Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

   Unscrew three self-locking (4f) and remove accumulator (4).

   Installation note 

   Replace self-locking hexagon nuts, 10 Nm.

   Fig 12: Identifying Self-Locking And Accumulator

   Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

   Notes on scrapping 

   The relevant safety provisions are to be observed when scrapping accumulators.

   In order to eliminate the basic pressure in the accumulator drill carefully on the convex side with a 3 mm drill bit until the gas flows out. To prevent accidents caused by the outliving gas and to protect against drilling chips, safety glasses and gloves must be worn. Apply minimal pressure, and do not allow the bit to penetrate any further into the bore hole (arrow) than absolutely necessary.

   Fig 13: Identifying Bore Hole

   Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
   1. 5 Install in reverse sequence.