390119 Removing and installing rear final drive

WM 390119 Removing and installing rear final drive

Technical values





Preliminary work

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 - section on "Removing" 397719 Removing and installing transverse lock servo motor

Removing rear final drive





Installation position of rear final drive

1. Loosen both drive shafts at the final drive. -> 422119 Removing and installing rear drive shaft - section on "Removing" 422119 Removing and installing rear drive shaft
2. Remove rear left wheel bearing housing (wheel carrier) without separating the drive shaft from the wheel bearing housing. -> 425219 Removing and installing rear wheel bearing housing (wheel carrier) - section on "Removing" 425219 Removing and installing rear wheel bearing housing (wheel carrier)
3. Lower the wheel carrier with the drive shaft.
4. Fit a stopper on the opening on the drive shaft at the final drive.
5. Remove heat protection on the cardan shaft at the tunnel support. -> 393519 Removing and installing rear cardan shaft - section on "Removing" 393519 Removing and installing rear cardan shaft
6. Loosen tunnel support for cardan shaft and leave the cardan shaft lying on the struts. -> 393519 Removing and installing rear cardan shaft - section on "Removing" 393519 Removing and installing rear cardan shaft
7. Mark the position of the cardan shaft with respect to the rear final drive.





Marking installation position of cardan shaft

8. Press the cardan shaft off the rear final drive pin using a mounting lever -A-.





Pressing off cardan shaft

9. Loosen centre bearing holder -1- and tie up the cardan shaft in the cardan tunnel.





Pressing off centre bearing holder

10. Only for vehicles with PDCC:

CAUTION

Kinked or overstretched lines

- Leaks in the hydraulic system

-> Only lower anti-roll bar slightly and secure it to the chassis.

Loosen rear anti-roll bar.
10.1. Unscrew four fastening screws -1- on the anti-roll bar -2- at the rear axle carrier and lower the anti-roll bar until you have easy access to the two screws on the rear final drive -3-.





Loosening rear anti-roll bar

10.2. Secure the anti-roll bar at this position on the axle mount.
11. Unscrew fastening screw -1- on the rear axle carrier at the front. Always counter with a ring wrench.





Releasing front final drive mounting

12. Unscrew two fastening screws -2- on the rear axle carrier at the rear. Always counter with a ring wrench.





Loosening rear final drive mounting

13. Tip up the drive flange -A-.





Raising front final drive

14. Get a second person to help you tip the final drive to the left -A- at the same time and lower it slowly -B-. Do not bend the drive shaft as far as it can go.





Lowering final drive

15. Remove final drive from the drive shaft at the rear right.
16. Fit a stopper on the opening on the drive shaft at the final drive.

Installing rear final drive

Information

- Screws that are tightened with a torque angle must be replaced with new ones.





Mounting for rear final drive

1. Place the final drive on a transmission jack with the help of another person and secure with a retaining strap. A second person is needed until => 5.
2. Remove stopper from the drive shaft flange at the right.
3. Fit final drive on the drive shaft at the right. -> 422119 Removing and installing rear drive shaft - section on "Installing" 422119 Removing and installing rear drive shaft
4. Align the final drive at the same time -A- and lower it slowly -B-. Do not bend the drive shaft as far as it can go.





Fitting final drive

5. Fit the final drive by gradually tipping the drive flange upwards -A-. Do not bend the drive shaft as far as it can go.





Fitting final drive

6. Tighten fastening screw on the rear axle carrier at the front to => Initial tightening: 90 Nm (67 ftlb.) => Final tightening: 90°. Always counter with a ring wrench.





Mounting for front final drive

7. Tighten two fastening screw on the rear axle carrier at the rear to => Initial tightening: 90 Nm (67 ftlb.) => Final tightening: 90°. Always counter with a ring wrench.





Mounting for rear final drive

8. Only for vehicles with PDCC:
Tighten four fastening screws -1- used to secure the anti-roll bar -2- to the rear axle carrier. -> 4X00IN Tightening torques for rear axle - section on "Installing" 4X00IN Tightening torques for rear axle





Securing rear anti-roll bar

9. Replace circlip at the input flange of the rear final drive.





Circlip

10. Position the cardan shaft at the marking on the rear final drive.





Marking installation position of cardan shaft

11. Fit the cardan shaft by jerking it onto the pin on the final drive. Drive on the shaft using a piece of wood -A- if necessary.





Fitting cardan shaft

12. Secure the tunnel support for the cardan shaft. -> 393519 Removing and installing rear cardan shaft - section on "Installing" 393519 Removing and installing rear cardan shaft
13. Install heat protection on the cardan shaft at the tunnel support. -> 393519 Removing and installing rear cardan shaft - section on "Installing" 393519 Removing and installing rear cardan shaft
14. Place the left wheel bearing housing with the drive shaft on the transmission support. Use a rubber base to prevent the wheel carrier from slipping! => Assembly aid for installing wheel carrier (shown as an example)





Assembly aid for installing wheel carrier (shown as an example)

15. Raise the wheel bearing housing and drive shaft into installation position using the transmission support.
16. Secure the wheel bearing housing. -> 425219 Removing and installing rear wheel bearing housing (wheel carrier) - section on "Installing" 425219 Removing and installing rear wheel bearing housing (wheel carrier)

Subsequent work

1. Install rear-differential lock servo motor. -> 397719 Removing and installing rear-differential lock servo motor - section on "Installing" 397719 Removing and installing transverse lock servo motor
2. Install the exhaust system. -> 260119 Removing and installing exhaust system - section on "Installing" Service and Repair
3. Check oil for final drive. -> 399035 Checking and topping up oil for rear final drive - section on "Checking" 399035 Checking and topping up oil for rear final drive