However, you can make the adjustment yourself with sufficient accuracy. To do this, you need a flat horizontal platform. If you don't have one, you can set the car wheels in a horizontal plane using pads under them.
Before adjustment, check:
- tire pressure;
- play in bearings and ball joints of the suspension;
- serviceability of shock absorbers;
- free play of the steering wheel.
We eliminate the detected faults.
The car must have wheels and tires of the same size, without radial and axial runout. The absence of runout can be checked visually by rotating the suspended wheels by hand.
Checking and adjustment can be done both on a loaded and unloaded vehicle. It is recommended to set the angles on a loaded vehicle – 70 kg on four seat cushions and 40 kg in the middle of the trunk.
We set the steering wheel to the neutral position corresponding to the straight-line movement of the car. Immediately before the check, we compress the car suspension 2-3 times, applying a vertical force of 40-50 kg to the bumpers.
We check and adjust the angles in the following sequence:
- longitudinal tilt angle of the pivot axis;
- camber angle;
- wheel alignment.
For a new car (before TO-1) the wheel alignment angles have the following values:
- camber: 0°30'+40'-30'
- longitudinal tilt angle of the pivot axis: 4°+1°-1°30'
- toe-in: 1–7 mm.
After carrying out TO-1 (after 2–3 thousand km of mileage) and during further operation of the vehicle, the wheel alignment angles should be: camber 0°30'±20' (0°5'±20'), longitudinal angle of inclination of the steering axis 4°±30' (3°±30'), toe-in 2–4 mm (3–5 mm).