1988-89 760 and 780
See Figure 1
Multi-link suspensions require alignment any time the suspension components are disassembled. Position of components is critical as are torque values when retightening bolts.
SPRING, SHOCK ABSORBER AND SUPPORT ARM
See Figure 2
It is important that the car be parked in a straight-ahead position with no side loadings in the suspension. After the car is in the work area, roll it forward and backwards 6-8 ft. (1.8-2.5 meters) and make sure the front and rear wheels point straight.
- Safely elevate and support both ends of the car. Make sure the front supports are placed as far forward as possible. Check that the rear supports will not interfere with the support arm.
- Remove the wheels. Loosen and remove the bolts holding the protective cover (guard) to the arm and remove the guard.
- At the front of the arm, remove the two retaining bolts which hold the bracket (for the support arm) to the frame. Don't attempt to remove the through bolt (eye bolt).
- Remove the retaining bolt at the rear of the support arm.
- Separate the rear end of the support arm from the wheel bearing housing.
- Using either Volvo tool 5972 or two floor jacks, support the arm at the front and rear ends. Elevate the jacks just enough to relieve the tension on the shock absorber.
- Remove the retaining bolt at the top of the shock abosorber.
- Lower the jacks slowly; the arm will come free with the spring and shock attached.
- Remove the spring and the upper and lower rubber seats. Unbolt the shock absorber from the arm. If the support arm is to be replaced, unbolt and remove the bracket at the front of the arm. Take note of the relationship between the bracket and the arm; the bracket correctly mounts one way only.
- Install the support arm bracket in the correct position and tighten the nut to 91 ft.lbs PLUS 120° of rotation.
- Install the shock absorber on the arm and tighten the bottom mount to 41 ft. lbs. (55 Nm).
- Install the bottom spring seat on the support arm. Take care to properly locate the grooves in the seat.
- Install the spring and the top rubber seat. Place the assembled support arm on the jacks and raise into position.
- Gently raise the jacks and 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. Insert the bolt and tighten it to