31 10 000 Removing And Installing Complete Front Axle (With Spring Struts)
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IMPORTANT:
Before removing front axle carrier: In order to avoid damage to lifting platform, perform weight compensation on vehicle. Load spring strut domes with sand bags.
WARNING:
Danger to life!
See 11 00 670 SECURING ENGINE IN INSTALLATION POSITION (N52) or 11 00 670 SECURING ENGINE IN INSTALLATION POSITION (N51) to prevent it from falling down. See 00 DANGER OF POISONING IF OIL IS INGESTED/ABSORBED THROUGH THE SKIN if oil is ingested/absorbed through the skin! See 00 RISK OF INJURY IF OIL COMES INTO CONTACT WITH EYES AND SKIN if oil comes into contact with eyes and skin!
See 11 00 670 SECURING ENGINE IN INSTALLATION POSITION (N52) or 11 00 670 SECURING ENGINE IN INSTALLATION POSITION (N51) to prevent it from falling down. See 00 DANGER OF POISONING IF OIL IS INGESTED/ABSORBED THROUGH THE SKIN if oil is ingested/absorbed through the skin! See 00 RISK OF INJURY IF OIL COMES INTO CONTACT WITH EYES AND SKIN if oil comes into contact with eyes and skin!
IMPORTANT:
Adhere to the utmost cleanliness. Do not allow any dirt to enter the hydraulic system. Close off pipe connections with plugs.
Recycling:
Catch and dispose of hydraulic fluid in a suitable container.
Observe country-specific waste-disposal regulations
Necessary preliminary tasks:
- Secure engine in installation position . See 11 00 670 SECURING ENGINE IN INSTALLATION POSITION (N52) or 11 00 670 SECURING ENGINE IN INSTALLATION POSITION (N51) .
- Clamp off battery negative lead . See 61 20 900 DISCONNECTING AND CONNECTING BATTERY NEGATIVE LEAD .
- Remove both brake calipers from swivel bearing and tie up. See 34 11 020 REMOVING AND INSTALLING OR REPLACING FRONT LEFT OR RIGHT BRAKE CALLIPER (TEVES) or 34 11 520 REMOVING AND INSTALLING/REPLACING FRONT LEFT OR RIGHT BRAKE CALIPER (BREMBO) .
- Remove front assembly underside protection . See 51 47 490 REMOVING AND INSTALLING/REPLACING FRONT UNDERBODY PROTECTION .
- If necessary, remove radiator seal
- If necessary, remove steering gear cover on left and right
- E88: Remove V-strut on left and right . See 51 61 011 REMOVING AND INSTALLING/REPLACING V-STRUT, FRONT AXLE CARRIER, LEFT OR RIGHT .
- E88: Remove diagonal struts from mounting fixture . See 51 61 017 REMOVING AND INSTALLING/REPLACING DIAGONAL STRUT, FRONT END, LEFT51 61 018 REMOVING AND INSTALLING/REPLACING DIAGONAL STRUT, FRONT END, RIGHT .
- Remove lower section of steering spindle from steering gear . See 32 31 070 REMOVING AND INSTALLING / REPLACING LOWER SECTION OF STEERING SPINDLE .
- If necessary, disconnect plug connection from ride-height sensor
- If necessary, disconnect vacuum line from electric changeover valve to engine mounts at T-piece
- Disconnect both plug connections for pulse generators and expose lines up to holder on spring strut
- Detach plug connection for brake pad sensor and expose lines up to holder on spring strut
Version with power steering:
- Draw off and dispose of hydraulic fluid from fluid reservoir
- Disconnect pressure line from vane pump . See 32 41 060 REMOVING AND INSTALLING OR REPLACING POWER STEERING VANE PUMP (N51, N52, N53) .
- Detach return line from power steering cooler and expose line up to connection on power steering gear. See 32 41... NOTES ON HYDRAULIC LINE WITH QUICK-CONNECT COUPLING .
Version with active steering:
Disconnect plug connections (1) and unclip connecting line (2) from front axle carrier.
Version with Electric Power Steering (EPS):
Disconnect plug connections (1) and expose wiring harness up to engine carrier.
Installation:
Plug connections must audibly snap into place.
Make sure wiring harness is correctly laid.
IMPORTANT:
Guide spring struts with your hand when lowering and raising in order to avoid damaging the wheel arches.
After lowering, the spring struts must be aligned to the front axle carrier and secured in such a way that the ball joints of the control arms, tension struts and tie rod ends are not damaged.
After lowering, the spring struts must be aligned to the front axle carrier and secured in such a way that the ball joints of the control arms, tension struts and tie rod ends are not damaged.
Remove both spring struts from spring strut dome . See 31 31 000 REMOVING AND INSTALLING COMPLETE LEFT OR RIGHT SPRING STRUT SHOCK ABSORBER .
Lower front axle support . See 31 11 506 LOWERING/RAISING FRONT AXLE CARRIER (UNIVERSAL LIFTER) or 31 11 506 LOWERING/RAISING FRONT AXLE CARRIER (SPECIAL TOOL SWZ00-2040) .
After installation:
- Fill and bleed hydraulic system . See 32 13 006 BLEEDING POWER STEERING UNIT .
- Check pipe connections for leaks
- Carry out wheel alignment check if a spring strut with support bearing was or has been installed without centering pin. See 32 00 150 KDS CHASSIS/WHEEL ALIGNMENT CHECK WITH LOAD UP TO DESIGN POSITION or 32 00 155 KDS CHASSIS/WHEEL ALIGNMENT CHECK WITH RIDE-HEIGHT MEASUREMENT WITHOUT LOAD .
- Carry out steering angle sensor adjustment/adjustment for active front steering . See 32 10 005 ADJUSTMENT FOR ACTIVE FRONT STEERING or 61 31 996 CARRYING OUT STEERING ANGLE SENSOR ADJUSTMENT .