General Information (Read First)

FINAL DRIVE, ADJUSTING






1. Input gear
- Adjusting, refer to Final Drive Input Gears
2. Pinion
- Only replace as complete set with ring gear
- Adjusting, refer to Ring and Pinion Gear Adjustments, below
3. Ring gear
- Only replace as complete set with pinion
- Adjusting, refer to Ring and Pinion Gear Adjustments, below
4. Shim S1 for ring gear
- Determining shim thickness, refer to Determining Shim S1 Thickness found in Ring Gear
5. Shim S2 for ring gear
- Determining shim thickness, refer to Determining Shim S2 Thickness found in Ring Gear
6. Shim S3 for pinion
- Determining shim thickness, refer to Determining Shim S3 Thickness found in Pinion Gear
7. Shim S4 for pinion
- Determining shim thickness, refer to Determining Shim S4 Thickness found in Pinion Gear
8. Shim for input gear
- Determining shim thickness, refer to Final Drive Input Gear
9. Tapered roller bearings for input gear
- Always replace as a set
- Measure turning torque with pinion
. Turning torque with new tapered roller bearings, measured at pinion, must be 165-245 Ncm (15-22 inch lbs) greater than turning torque for pinion alone
- When replacing bearings, determine new required shim thickness, refer to Final Drive Input Gear
10. Tapered roller bearings for differential
- Always replace as a set
- Measure turning torque with pinion Turning torque with new tapered roller bearings, measured at pinion, must be 50-70 Ncm (4-6 inch lbs) greater than turning torque for pinion alone
- When replacing bearings, determine new required thickness for shims S1 and S2, refer to refer to Ring and Pinion Gear Adjustments, below
11. Tapered roller bearing (large) for pinion
- Always replace with small tapered roller bearings (12 in illustration)
- Turning torque with new tapered roller bearings must be 80-220 Ncm (7-19 inch lbs)
- When replacing bearings, determine new required thickness for shims S3 and S4, refer to Pinion Gear
12. Tapered roller bearing (small) for pinion
- Always replace with large tapered roller bearings (11 in illustration)
- Turning torque with new tapered roller bearings must be 80-220 Ncm (7-19 inch lbs)
- When replacing bearings, determine new required thickness for shims S3 and S4, refer to Pinion Gear

LIST OF REQUIRED ADJUSTMENTS
When working on the transaxle, it should be noted that readjustment of the input gear, pinion, ring gear or gear set is only necessary if components that directly influence the setting of the final drive have been replaced. To keep from making unnecessary adjustments, refer to the following table.






PINION AND RING GEAR ADJUSTMENTS
General Information
Careful adjustment of the drive pinion and ring gear is essential for long life and quiet running of the final drive. For this reason, drive pinions and ring gears are matched during production and checked with a special gauging machine to ensure the proper contact pattern and quiet running in both directions of rotation. The position of quietest running is determined by moving the drive pinion in an axial direction, with the ring gear being constantly raised out of zero-play meshing until the backlash is within a specified tolerance.

The deviation "r" is measured in relation to the master gauge setting "Ro" for the gear sets supplied as service parts, and this value is inscribed on the outer circumference of the ring gear. Any gear set-drive pinion and ring gear-must be replaced together as a complete set.

Description Of Markings On Gear Sets





Gear set markings (example)
1 Marking "1141" indicates an Oerlikon gear set with the ratio 41:11 (3.73:1)
2 Matching number of gear set (e.g. 312)
3 Deviation "r" from master gauge used in production;
Expressed in mm/100;
Example; "26" means deviation "r" = 0.26 mm.
Ro Length of master gauge used in production;
Ro = 59.2 mm
R Actual dimension between ring gear axis and face end of drive pinion at the point of quietest running for the particular gear set
VO Hypoid offset

Recommended Sequence For Adjusting Ring Gear And Pinion
When pinion and ring gear have to be adjusted it is advisable to carry out the adjustments in the following sequence:

1. Determine total shim thickness Stotal (S1 + S2) required to achieve the specified preload for the differential tapered roller bearings.

2. Determine total shim thickness Stotal (S3 + S4) required to achieve the specified preload for the pinion tapered roller bearings.

3. Distribute the total shim thickness Stotal (S3 + S4) between S3 and S4 so that the dimension from the ring gear axis to pinion end face corresponds with dimension R. determined during production.

4. Distribute the total shim thickness Stotal (S1 + S2) between S1 and S2 to achieve the specified backlash between the ring gear and the pinion.

The objective of the adjustment is to re-create the position of quietest running as was determined on the special gauging machine in production.

The maximum care and cleanliness during all removal, installation, and measurement operations is essential for achieving satisfactory results.





Shim Locations
S1 Shim for ring gear in differential cover
S2 Shim for ring gear in transmission housing
S3 Shim for pinion in transmission housing
S4 Shim for pinion between output gear and spacer