Steering and Suspension

Page 40

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Volvo Bus Service and Maintenance Manual

 Wheel alignment
79 Park on a flat surface with the front wheels pointing straight ahead. Check toe-in and adjust if necessary.
 Trailing unit tracking (artic bus)
 Check the tracking if there is tyre wear or if the driving is not as it should be. This is done with a laser instrument or corresponding, see Service Manual, Section 6, B10M ( 20001-). If necessary, adjust the drag link in the trailing unit steering linkage.
 Steering damper
80 Check that the plunger rod is clean and that the damper is not leaking.

Wheel alignment

Even wear on the tyres indicates that the bus has properly adjusted wheel angles. Where this is the case, a regular check on the wheel alignment is normally not required. It is only first when there are complaints about the condition of the bus when driving and/or there are signs of tyre wear that such a check should be carried out.

Lopsided air bellows can be a sign that the axle is at an angle. A complete wheel alignment check involves measuring the following:

-Max. curve angle and curve-angle difference.

Toe-in should be 0-3 mm (0-0.12 in). From a tyre wear point of view, we recommend a toe-in as near 0 mm as possible.

Wheel alignment checks

Steering damper

If the steering damper shows tendencies to leak, tighten up the sealing ring. The tightening torque for the counternut is 50-60 Nm (0.5-0.6 kgf m). If the plunger rod surface is damaged, the steering damper should be replaced.

Steering damper check