390119 Removing and installing rear final drive
WM 390119 Removing and installing rear final drive
Tools
Technical values
Preliminary work: Rear final drive
1. Remove exhaust system. -> 260119 Removing and installing exhaust system - section on "removing" Service and Repair
Preliminary work: Rear final drive
1. Remove exhaust system. -> 260119 Removing and installing exhaust system - section on "removing" Service and Repair
2. Remove longitudinal interlock servo motor. -> 397719 Removing and installing rear-differential lock servo motor - "Removing" section 397719 Removing and Installing Transverse Lock Servo Motor
Removing rear final drive
Overview of removing and installing rear final drive
1. Move selector lever to position N.
2. Loosen fastening screws for fixing cardan shaft centre bearing holder to body.
Cardan shaft holder to body
3. Loosen bolts for fixing centre bearing to holder.
Centre bearing to cardan shaft holder
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.
Match points on the cardan shaft
Information
- To loosen the cardan shaft on the rear axle transmission, a second fitter should counter the fastening screws on the triangular flange of the transfer box.
4. Remove cardan shaft from rear axle differential and tie it up.
Tying up rear cardan shaft
Information
- To loosen the drive shaft bolts on the rear axle transmission, a second fitter should sit in the vehicle and block the rear-axle final drive by actuating the foot brake.
5. Remove both drive shafts on transmission side and tie them up.
Removing rear drive shaft
6. Support transmission jack and rear axle differential with a retaining strap.
7. Unscrew fastening screws for final drive. To do this, counter with a ring wrench.
Mount for rear final drive
8. Tip drive flange upwards -arrow- and gradually drain rear axle differential. Remove vent line at the same time.
Removing rear final drive
9. Remove transmission and pull off vent line => Removing vent line.
Removing vent line
Installing rear final drive
Information
- Screws which are tightened with a torque angle must be replaced with new ones.
Mount for rear final drive
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.
Match points on the cardan shaft
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.
Installing transmission
3. Screw in new fastening screws on the final drive. To do this, counter with ring wrench. => Initial tightening: 90 Nm (67 ftlb.) => 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. -> 4200TW00 Tightening torques for rear axle
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 ftlb.) => Final tightening: 90°
Cardan shaft to rear final drive
6. New fastening screws must be used to secure the cardan shaft centre bearing holder to the body. => Tightening torque: 60 Nm (44 ftlb.)
Cardan shaft holder to body
Information
- Centre bearing must be installed without tension.
- Fit special tool centering tool 9680 -tool in mounting position- in the order specified.
Installation position for special tool
7. Position special tool centering tool 9680.
Alignment of special tool 9680
8. Press on special tool centering tool 9680 in sequence according to numbering -1, 2-.
Installation of special tool 9680
9. Tighten threaded joints -arrow- connecting holder to centre bearing. => Tightening torque: 20 Nm (15 ftlb.)
Cardan shaft holder to centre bearing
10. Remove special tool centering tool 9680.
Removing special tool 9680
Subsequent work: Rear final drive
1. Install the exhaust system. -> 260119 Removing and installing exhaust system - section on "Installing" Service and Repair
Subsequent work: Rear final drive
1. Install the exhaust system. -> 260119 Removing and installing exhaust system - section on "Installing" Service and Repair
2. Install servo motor for rear-differential lock. -> 397719 Removing and installing rear-differential lock servo motor - "Installing" section 397719 Removing and Installing Transverse Lock Servo Motor