Volvo 240/740/760/780/940/960 1990-1998

Shock Absorber

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REMOVAL & INSTALLATION



Except 850, 960 Sedan and 1998 Models
  1. Raise and safely support the vehicle.
  2.  
  3. Place a jack under the lower arm and lift the rear suspension to unload the shock.
  4.  
  5. Remove the lower nut and bolt securing the shock to the rear axle.
  6.  
  7. Lower the vehicle enough to remove the shock.
  8.  
  9. Remove the upper shock absorber through-bolt.
  10.  
  11. Remove the old shock absorber.
  12.  

To install:
  1. Install the shock absorber in the upper mount and hand-tighten the through-bolt.
  2.  
  3. Raise the rear end and attach the shock using the lower mount bolt. Hand-tighten the nut.
  4.  
  5. Tighten the lower bolt to 63 ft. lbs. (85 Nm).
  6.  
  7. Remove the jack.
  8.  
  9. Lower the vehicle.
  10.  
  11. Tighten the upper bolt to 63 ft. lbs. (85 Nm).
  12.  

1992-94 960 Sedan

Multi-link suspensions require alignment any time the suspension components are disassembled. Installation and tightening procedures are critical to correct alignment.

  1. Raise and support the vehicle safely. Make sure the jackstands are placed as far forward as possible. Check that the rear jackstands will not interfere with the floor jack.
  2.  
  3. Remove the wheels.
  4.  
  5. Remove the bolts holding the protective guard to the control arm, and remove the guard.
  6.  
  7. At the front of the arm, remove the two retaining bolts which hold the bracket (for the support arm) to the frame. Do not attempt to remove the through-bolt.
  8.  
  9. Remove the retaining bolt at the rear of the support arm.
  10.  
  11. Separate the rear end of the support arm from the wheel bearing housing.
  12.  
  13. Using either Volvo tool 5972 or two floor jacks, support the arm at the front and rear ends. Raise the jacks just enough to unload the shock.
  14.  
  15. Remove the retaining bolt at the top of the shock absorber.
  16.  
  17. Lower the jacks slowly; the arm will come free with the spring and shock attached.
  18.  
  19. Remove the spring with the upper and lower rubber seats.
  20.  
  21. Unbolt the shock absorber from the arm.
  22.  

To install:
  1. Install the shock absorber on the arm and tighten the bottom mount to 41 ft. lbs. (56 Nm).
  2.  
  3. Install the bottom spring rubber seat on the support arm. Take care to properly locate the grooves in the rubber seat.
  4.  
  5. Install the spring and the top rubber seat.
  6.  
  7. Place the assembled support arm on the jacks and raise into position.
  8.  
  9. Compress the spring until the shock absorber is in the correct position. The shock may be held in place temporarily with a drift in the hole.
  10.  
  11. Insert the bolt, and tighten to 62 ft. lbs. (85 Nm).
  12.  
  13. Reinstall the mounting bolts at the front of the support arm bracket and tighten to 35 ft. lbs. (48 Nm). Tighten the large nut to 51 ft. lbs. (70 Nm) plus an additional 90 degrees of rotation.
  14.  
  15. At the rear of the support arm, tap the arm into place on the wheel bearing housing. Tighten the bolt to 44 ft. lbs. (60 Nm) plus an additional 90 degrees of rotation. Do not overtighten.
  16.  
  17. Reinstall the protective cover on the control arm.
  18.  
  19. Install the wheel.
  20.  
  21. Lower the vehicle.
  22.  
  23. Roll the vehicle several feet forwards and backwards before adjusting the rear wheel alignment.
  24.  

1995-98 960/S90/V90 and AWD V70 Series
  1. Raise and safely support the rear of the vehicle with jackstands. Place the jackstands so they do not interfere with the support arm of the vehicle.
  2.  
  3. Remove the wheel.
  4.  
  5. Use a floor jack and raise up the support arm.
  6.  
  7. Disconnect the shock absorber from the support arm.
  8.  
  9. Disconnect the shock absorber from the body. Remove the shock absorber.
  10.  

To install:
  1. Install the shock absorber and connect it to the body using a new bolt. Tighten the bolt to 59 ft. lbs. (80 Nm).
  2.  
  3. With the support arm raised, connect the shock absorber to the support arm and install a new bolt. Tighten the bolt to 59 ft. lbs. (80 Nm).
  4.  
  5. Carefully lower the lift from the support arm.
  6.  
  7. Install the wheels.
  8.  
  9. Lower the vehicle.
  10.  

850, C70, S70 and V70, Except AWD Models

See Figures 1, 2, 3 and 4

  1. On early four door Series, remove the plastic side panel, then fold the back seat forward and fold back the trunk carpet. Remove the support panel under the edge of the carpet and detach the side panels at the front and fold them over. Remove the back seat catch and panel mounting clip.
  2.  
  3. On later four-door series, remove the support panel over the shock mount. Make small cuts in the panel if necessary to fold it up.
  4.  
  5. On five-door series, remove the front floor panel bolts and pull the panel back to free it from the front mount.
  6.  
  7. Remove the panel.
  8.  
  9. Raise and safely support the vehicle.
  10.  
  11. Remove the two upper shock mount bolts.
  12.  
  13. Using a floor jack, press the trailing arm up to unload the shock absorber.
  14.  
  15. Disconnect the shock absorber from the lower mount, then pull it off of the trailing arm.
  16.  
  17. Lower the vehicle and lift the shock assembly out from the top.
  18.  
  19. Check the shock upper mount bushing for damage and replace if necessary.
  20.  

To install:
  1. Install the upper mount on the new shock as follows:

    Standard shock absorbers to 30 ft. lbs. (40 Nm)
     
    Gas shock absorber M12 nuts to 30 ft. lbs. (40 Nm)
     
    Gas shock absorber M10 nuts to 15 ft. lbs. (20 Nm), plus an additional 90 degrees
     

  2.  
  3. Install the shock absorber in the vehicle and turn the upper mount bolts a few turns.
  4.  
  5. Raise the vehicle and position the jack under the trailing arm and lift up.
  6.  
  7. Connect the shock to the lower mount, making sure that the shock is seated correctly in the upper mount.
  8.  
  9. Tighten the nut to 59 ft. lbs. (80 Nm).
  10.  
  11. Lower the vehicle.
  12.  
  13. Tighten the upper shock mount bolts to 18 ft. lbs. (25 Nm).
  14.  
  15. Install the front edge of the panels using the clips.
  16.  
  17. Install the back seat catches and bolts with thread locking compound, tightening to 15 ft. lbs. (20 Nm).
  18.  
  19. Replace the cover plate and trunk carpet.
  20.  
  21. On later four-door series, fold down the cover over the shock mount and install the carpeting.
  22.  
  23. On five-door series, line up the front edge of the floor panel and install the bolt at the rear edge. Line up the panel with the rear floor panel and tighten the bolts.
  24.  



Click image to see an enlarged view

Fig. Fig. 1: Remove the carpet to access the upper shock absorber mount



Click image to see an enlarged view

Fig. Fig. 2: Remove the two upper shock absorber mounting bolts



Click image to see an enlarged view

Fig. Fig. 3: Remove the shock absorber from the vehicle



Click image to see an enlarged view

Fig. Fig. 4: Remove the upper mount and bushing if replacing the shock absorber; it will need to be attached to the replacement shock

TESTING



See Figure 5

The purpose of the shock absorber is simply to limit the motion of the spring during compression and rebound cycles. If the vehicle is not equipped with these motion dampers, the up and down motion would multiply until the vehicle was alternately trying to leap off the ground and to pound itself into the pavement.

Contrary to popular rumor, the shocks do not affect the ride height of the vehicle. This is controlled by other suspension components such as springs and tires. Worn shock absorbers can affect handling; if the front of the vehicle is rising or falling excessively, the footprint of the tires changes on the pavement and steering is affected.

The simplest test of the shock absorber is simply push down on one corner of the unladen vehicle and release it. Observe the motion of the body as it is released. In most cases, it will come up beyond it original rest position, dip back below it and settle quickly to rest. This shows that the damper is controlling the spring action. Any tendency to excessive pitch (up-and-down) motion or failure to return to rest within 2-3 cycles is a sign of poor function within the shock absorber. Oil-filled shocks may have a light film of oil around the seal, resulting from normal breathing and air exchange. This should NOT be taken as a sign of failure, but any sign of thick or running oil definitely indicates failure. Gas filled shocks may also show some film at the shaft; if the gas has leaked out, the shock will have almost no resistance to motion.



Click image to see an enlarged view

Fig. Fig. 5: When fluid is seeping out of the shock absorber, its time to replace it

While each shock absorber can be replaced individually, it is recommended that they be changed as a pair (both front or both rear) to maintain equal response on both sides of the vehicle. Chances are quite good that if one has failed, its mate is weak also.

 
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