Installing Rear Final Drive

Information 

• Screws which are tightened with a torque angle must be replaced with new ones. 
  Fig 1: Tightening Rear Final Drive Fastening Screws

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Information 

• The colour marking, match point, on the cardan shaft and on the flange of the rear final drive must be installed in alignment -arrows- . This will neutralise the residual imbalance of the components. 

Fig 2: Locating Matching Points On Cardan Shaft

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1. Secure rear axle transmission on the transmission jack with a retaining strap.
2. Run in rear axle differential by gradually tipping the drive flange upwards -arrow-  . Connect the bleeder line at the same time.
   Fig 3: Installing Transmission

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3. Screw in new fastening screws on the final drive. To do this, counter with ring wrench. → Initial tightening: 90 Nm (67 ft lbs.)  → Final tightening: 90° 

   Information 

   • To tighten the drive shaft bolts on the rear final drive, a second fitter should sit in the vehicle and block the rear-wheel drive assembly by actuating the foot brake. 
4. Attach drive shafts using new screws. → WM 4200TW TIGHTENING TORQUES FOR REAR AXLE (ALL MODELS)

   Information 

   Align the colour marking (matchpoint) on the cardan shaft and on the flange of the rear final drive during installation.

   Information 

   • To attach the cardan shaft to the rear final drive, a second fitter should counter the fastening screws on the triangular flange of the transfer box. 
5. Attach cardan shaft using new screws. → Initial tightening: 30 Nm (22 ft lbs.)  → Final tightening: 90° 
   Fig 4: Installing Cardan Shaft To Rear Final Drive

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6. New  fastening screws must be used to secure the cardan shaft centre bearing holder to the body. → Tightening torque: 60 Nm (44 ft lbs.) 
   Fig 5: Locating Cardan Shaft Holder To Body Screws

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   Information 

   • Centre bearing must be installed without tension. 
   • Fit special tool centring tool 9680 -Werkzeug in Einbaulage- in the order specified. 
     Fig 6: Identifying Installation Position Of Special Tool

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7. Position special tool centring tool 9680  .
   Fig 7: Alignment Special Tool (9680)

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8. Press on special tool centring tool 9680  in sequence according to numbering -1, 2-. 
   Fig 8: Pressing Special Tool (9680)

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9. Tighten threaded joints -arrow-  connecting holder to centre bearing. → Tightening torque: 20 Nm (15 ft lbs.) 
   Fig 9: Locating Cardan Shaft Holder To Centre Bearing Screws

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10. Remove special tool centring tool 9680. 
    Fig 10: Removing Special Tool (9680)

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