Backlash Adjustment

1. Install a dial indicator to the case using a magnetic base.
2. Place the indicator stem at the heel end of a tooth.
- Set the dial indicator so that the stem is in line with the gear rotation and perpendicular to the tooth angle.
3. Check and record the backlash at three or four points around the ring gear.
- The pinion must be held stationary when checking backlash.
- The backlash should be the same at each point within 0.05 mm (0.002 inch). If the backlash varies more than 0.05 mm (0.002 inch), check for burrs, a distorted case flange, uneven bolting conditions, or foreign matter between the case and the ring gear.
4. The backlash at the minimum lash point measured should be between 0.125 to 0.200 mm (0.005 to 0.008 inch). The maximum acceptable reading is 0.076 to 0.203 mm (0.003 to 0.008 inch).





5. If the reading is too high, remove the adjusting nut locks, and loosen the right nut one slot. Then tighten the left nut one slot.
6. If the reading is too low, remove the adjusting nut locks, and loosen the left nut one slot. Then tighten the right nut one slot.
- The side bearing preload will not change as long as the adjusting nut is tightened an equal amount to the nut which was loosened.