GEAR CONTACT PATTERN
Gear tooth contact pattern is used to verify the correct running position of the ring and pinion gears. This will produce low noise and long gear life. Gears which are not positioned properly may be noisy and have shorten gear life.
Scheme 19
Scheme 20
Scheme 21
Scheme 22
Scheme 23
Scheme 24
Scheme 25
Scheme 26
- Wipe clean each tooth of the ring gear.
- Apply gear marking compound to all of the ring gear teeth.
- Verify bearing cap bolts are torque specification.
- Apply the brakes lightly to create at 14 N.m (10 ft. lbs.) pinion rotating torque.
- Rotate the pinion/pinion yoke 4 full revolutions in each directions.
- Read gear tooth contact pattern: Gear contact pattern correct (Scheme 20) Backlash and pinion depth is correct. Ring gear too far away from pinion gear (Scheme 21) Decrease backlash by moving the ring closer to the pinion gear. Ring gear too close to pinion gear (Scheme 22) Increase backlash, by moving the ring away from the pinion gear. Ring gear too far away from pinion gear (Scheme 23) Decrease backlash, by moving the ring closer to the pinion gear. Ring gear too close to pinion gear (Scheme 24) Increase backlash, by moving the ring away from the pinion gear. Pinion gear set too low (Scheme 25) Increase pinion gear height, by increasing the pinion depth shim thickness. Pinion gear set too high (Scheme 26) Decrease pinion depth, by decreasing the pinion depth shim thickness.