Adjustment and Marking of Gear Sets

General Notes:
- Careful adjustment of drive pin ion and ring gear is essential for long life and quiet running ofthe final drive. For this reason, drive pinions and ring gears are matched during the production phase and checked with a special gauging machine to ensure proper contact pattern and quiet running in both directions of rotation. The position of the 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 to a point where the torsion backlash varies within a specified tolerance.
- The deviation "r" is measured in relation to the master gauge Ro for the drive gear sets supplied as service parts and this value is inscribed on the outer circumference of the ring gear. Each drive gear set -drive pinion and ring gear- must only be replaced together.

Adjustment And Marking Of Gear Sets
Gear sets supplied as service parts
1. Marking "0937" means:
Oerlikon drive gear set with the ratio 37:9 (4.11:1)
2. ID number of matched drive gear set (e.g. 312)
3. Deviation "r" measured against master gauge of special gauging machine used in production. Deviation "r" is stated in 1/100 mm. Example: "25" means r = 0.25 mm
Ro. Length of master gauge used on special gauging machine.
Example: Ro for 170 mm diameter ring gear = 54.95 mm
R. Actual distance between ring gear shaft and face end of drive pinion at the point of quietest running for this particular matched gear set
Vo. Hypoid offset






Gear Sets Used In Series Production
- Data that is not required for series production is crossed out with an "X" in the illustration.
- Setting used in series production

CAUTION! In series production the position of the drive pinion is determined by dimension Po (center of ring gear to rear face of drive pinion). Deviation "r" and the matching number ofthe set are not inscribed on the ring gear. Because the deviation "r" is unknown, an actual measurement must be carried out before removing the drive pinion when parts that directly affect the installation position of the drive pinion are replaced. Refer to "Pinion, Determining Installation Position" at Front Final Drive Ring Gear and Pinion. Adjustments