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X-631 Wheel Aligner Product Service Manual Appendix 4
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existence of intermittent or non-adjustable factors, the steering wheel may be at the position within the range of ±5°from the
centered position…it is still normal. In special case, for some individual vehicles, the steering wheel may be deviated more
than 10°after normal adjustment. In this case, please do not think that the wheel aligner is not accurate at first. Now you
should perform the following procedures:
1.
Check for light interference.
2.
Check if the following factors causing the vehicle pull aside exist or not.
3.
If you cannot find the existing factors mentioned above (It doesn’t indicates that there are not problems), please test
more than 3 vehicles to see if the steering wheel has the same problem…deviating to the same direction.
4.
If it does, it is required to check the wheel aligner for some problem.
5.
If it doesn’t, it indicates that the wheel aligner has no problem, please check for other problems. For some parameters
which cannot be adjusted, you can combine camber and toe angle to solve the problem according to your experience.
For the issue of vehicle side pull:
when the vehicle is driven straight-ahead, if the driver
leaves his hands off the steering wheel, the vehicle will pull to left or right side.
a. Vehicle side pull is caused by:
1. The difference between left and right casters of the front wheels is more than 0.5°, and the vehicle will pull to the
side with smaller caster.
2. The difference between left and right cambers of the front wheels is more than 0.5°, and the vehicle will pull to the
side with maximum positive camber.
3. The difference between left and right cambers of the rear wheels is more than 0.5°, and the vehicle will pull to the
side with minimum camber.
4. You can observe the change of the vehicle wheelbase according to the setbacks of front and rear axles. If the sum
of front and rear setbacks is more than 0.2°, the vehicle side pull can be felt, and it is to the side with smaller wheelbase.
5. Sideslip, mostly caused by the tire
6. Tire pressure is not even.
7. The brake to the vehicle is asymmetric, and the vehicle skid.
8. Unbalanced power steering.
9. Suspension parts are worn and work abnormal. Due to wheel aligner cannot detect all the factors causing the
vehicle pull aside, sometimes it is all normal according to the wheel aligner, but the vehicle still pulls aside
during driving, and you should shoot troubles one by one in this kind of condition.
b. Tire wear, it is mainly caused by the following three factors:
1. Front tire wear on two outsides or insides simultaneously ——front toe-in angles are not correct.
2. Front tire wear on the single wheel, camber is not correct.
