Mercedes Coupes/Sedans/Wagons 1974-1984 Repair Guide

Axle Shaft

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The rubber covered joints are filled with special oil. If they are disassembled for any reason, they must be refilled with the special oil.

REMOVAL & INSTALLATION Except 190D, 190E, 380SEC and 500SEC Models



MODELS WITHOUT TORQUE COMPENSATOR (TORSION BAR)

See Figures 1 through 9

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Fig. Fig. 1: Most models do not come equipped with a torque compensator (torsion bar), indicated here by the arrow



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Fig. Fig. 2: To remove the rear axle shaft, drain the differential fluid



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Fig. Fig. 3: Loosen the rubber mount-to frame bolts



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Fig. Fig. 4: Loosen the rubber mount-to-differential cover bolts ...



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Fig. Fig. 5: ... then remove the rubber mount



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Fig. Fig. 6: Loosen the differential cover bolts



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Fig. Fig. 7: Remove the differential cover and set it aside



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Fig. Fig. 8: Use a prytool to disengage the axle lock ring, then remove it from the differential



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Fig. Fig. 9: After the axle has been pressed from the flange, remove it from the differential

Most models do not use a torque compensator (torsion bar) which is actually a steel bar used to locate the rear axle under acceleration. In general only the 450 series cars and the 300SD use a torque compensator, but it is wise to check for one before servicing the axle shaft. The illustrations apply to either type.

On the 280, 280C, and 280E only axle shafts identified with a yellow paint dot or part no. 107 350 07 10 (left) or part no. 107 350 0810 (right) can be installed.

  1. Jack up the rear of the car and remove the wheel and center axle hold-down bolt (in hub).
  2.  
  3. Remove the brake caliper and suspend it from a hook.
  4.  
  5. Drain the differential oil and place a jack under the differential housing.
  6.  
  7. Unbolt the rubber mount from the chassis and the differential housing, then remove the differential housing cover to expose the ring and pinion gears.
  8.  
  9. Press the shaft from the axle flange. If necessary, loosen the shock absorber.
  10.  
  11. Using a screwdriver, remove the axle lock ring inside the differential case.
  12.  
  13. Pull the axle from the housing by pulling the splined end from the side gears, with the spacer.
  14.  

Axle shafts are stamped R and L for right and left units. Always use new lockrings.

  1. Installation is the reverse of removal. Fill the rear axle.
  2.  


WARNING
Check end-play of the lock ring in the groove. If necessary, install a thicker lock ring or spacer to eliminate all end-play, while still allowing the lock ring to rotate. Do not allow the joints in the axle shaft to hang free or the joint bearing may be damaged and leak.

MODELS WITH TORQUE COMPENSATOR (TORSION BAR)
  1. Drain the oil from the rear axle.
  2.  
  3. Disconnect and plug the brake lines.
  4.  
  5. Loosen the connecting rod and unscrew the torsion bar bearing bracket. Lower the exhaust system slightly and remove the torsion bar.
  6.  
  7. Lower the shock absorber.
  8.  
  9. Remove the bolt which attaches the rear axle shaft to the rear axle shaft flange.
  10.  
  11. Disconnect the brake cable control. Remove the bracket from the wheel carrier, remove the rubber sleeve, and push back the cover.
  12.  
  13. Press the rear axle shaft out of the flange with a suitable tool.
  14.  
  15. Support the rear axle with a jack.
  16.  
  17. Remove the rear rubber mount.
  18.  
  19. Clean the axle housing and remove the cover from the housing.
  20.  

The axle shafts are the floating type and can be compressed in the constant velocity joints.

  1. Remove the locking ring from the end of the axle shafts which engage the side gears in the differential.
  2.  
  3. Disengage the axle shaft from the side gear and remove the axle shaft together with the spacer.
  4.  


WARNING
Do not hang the outer constant velocity joint in a free position (without any support), as the shaft may be damaged and the constant velocity joint housing may leak.

  1. Installation is the reverse of removal.
  2.  
  3. If either axle shaft is replaced, be sure that the proper replacement shaft is installed. Axle shafts are marked L and R for left and right.
  4.  
  5. Check the end-play between the lockring on the axle shaft and the side gear. There should be no noticeable end-play, but the lockring should be able to turn in the groove.
  6.  
  7. Be sure to bleed the brakes and fill the rear axle with the proper quantity and type of lubricant.
  8.  

190D, 190E, 380SEC and 500SEC Models

  1. Loosen, but do not remove, the axle shaft collar nut.
  2.  
  3. Raise the rear of the vehicle and support it on jackstands.
  4.  
  5. Disconnect the axle shaft from the hub assembly. On the 190, make sure that while loosening the locking screws, the bit is seated properly in the multi-tooth profile of the screws.
  6.  
  7. Remove the self-locking screws that attach the inner CV-joint to the connecting flange on the differential. Always loosen the screws in a crosswise manner.
  8.  

Make sure that the end cover on the inner CV-joint is not damaged when separated from the connecting flange.

  1. While supporting the axle shaft, use a slide hammer or the like and press the axle shaft out of the hub assembly.
  2.  
  3. Tilt the axle shaft down and remove it.
  4.  


WARNING
Make sure that the CV-joint boots are not damaged during the removal process.

  1. Installation is in the reverse order of removal. Please note the following:
    1. Always clean the connecting flanges before installation.
    2.  
    3. Always use new self-locking screws. On the 190, moisten the screw threads and contact faces with oil before installing. Tighten the screws to 51 ft. lbs. (70 Nm) on the 190 and 90-105 ft. lbs. (125-145 Nm) on the others. Always tighten the screws in a crosswise pattern.
    4.  
    5. Tighten the axle shaft collar nut to 203-230 ft. lbs. (280-320 Nm) on the 190 and 22 ft. lbs. (30 Nm) on the others. On the 190, lock the collar nut at the crush flange (see illustration).
    6.  

  2.  

 
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