Over-Center Preload

With worm bearing preload adjusted, turn worm shaft slowly from stop to stop while counting total number of turns. Then, turn shaft half-way back to exact center position. Loosen lock nut and turn over-center adjustment screw in until all lash is taken out of shaft. Tighten lock nut.
Rotate worm shaft slightly off center (45-90°), then attach an INCH Lbs. torque wrench to worm shaft. Using torque wrench as a lever, rotate worm shaft back through center position and record rotating torque. If rotating torque is not to specifications, repeat procedure. Final rotation of adjustment screw must be clockwise; therefore, if maximum specification was exceeded, screw must be backed out, then rotated in (clockwise) to approximate new setting.

OVER-CENTER ADJUSTMENT

Application

Over-Center Preload⁽¹⁾

Maximum Total

Chrysler Corp.

"B" & "PB" Models

3-6

11.5

All Other Models

5-10

Ford Motor Co.

"E" Models

4-10

"F" Models

7-8

General Motors

G10-30

5-11

C10-30, P10 & K10-20

4-10

P20-30

9-13

IHC

4-10

Jeep

5-10

⁽¹⁾	Amount in excess of worm bearing preload.

Fig 1: Steering Gear Cross Section

Courtesy of NOT AVAILABLE