Recommended Sequence of Operations

When the ring gear and pinion have to be adjusted, the following sequence of operations is recommended to avoid unnecessary work:
1- Determine total shim thickness S-total (S1 plus S2) to give the specified preload of the differential tapered roller bearings.
2- Determine total shim thickness S3 so that the installed position of the pinion is the same as obtained on the test machine in production.
3- Split up total shim thickness S-total into S1 and S2. in such a way that the specified backlash is obtained between ring gear and pinion.
The purpose of the adjustment is to set the ring gear and pinion to re-create the quietest running position, as determined on the special gauging machine used in production.
All assembly operations and measurements require the greatest care and scrupulous cleanliness if accurate results are to be obtained.