Note: Adjustment is performed with the steering gear removed.
1. Loosen the lock nut (1) of the adjustment screw (2) of the bipod shaft.
2. Completely unscrew the bipod shaft adjustment screw (counterclockwise rotation).
3. Turn the adjusting screw one full turn (clockwise rotation).
4. Turn the input shaft in any direction until it stops. Rotate the shaft in the opposite direction until it stops and count the number of revolutions.
5. Starting from the second stop, turn the shaft in the opposite direction by half the number of revolutions. This will be the central position of the mechanism.
6. Check the central position of the mechanism in the following positions:
- the chamfer on the input shaft (2) must be facing upwards (parallel to the side cover);
- the master spline (3) of the bipod shaft must be aligned with the axis of the adjusting screw (1) of the bipod shaft.
7. Install a torque wrench on the input shaft so that its handle is vertical.
8. Rotate the input shaft 45 degrees either side of the center position. The shaft should rotate smoothly and without jamming.
9. Record the value of the worm bearing tension in the central position of the mechanism (shaft breakaway moment).
10. The breaking moment should be equal to 0.7-1.7 Nm (with worm and ball nut installed). If the starting torque is outside the permissible range, adjust it.
11. To obtain the required breakaway torque, adjust the preload of the center position of the bipod shaft by turning the bipod shaft adjusting screw clockwise.
12. Increase the load by 0.7-1.1 N·m above the worm bearing preload. Tighten the adjusting screw lock nut. Tightening torque 49 N·m.
13. Install the steering gear on the vehicle and bleed the power steering system.
[The original source of the article is the website «ChevyMan.ru»]