MAINTENANCE MANUAL - Meritor

Assembly and Installation1. Adjust the backlash of a new gear set to0.005-0.015-inch (0.13-0.38 mm). Adjust thebacklash of an old gear set to the setting thatyou measured before the differential was disassembled.See the Ring Gear Backlash inthis section.2. Apply a marking compound onto approximately12 gear teeth of the ring gear. Rotate thering gear so that the 12 gear teeth are next tothe drive pinion. Figure 4.34.1 - GOOD HAND-ROLLED PATTERNFigure 4.35Figure 4.343. Rotate the ring gear forward and backwardso that the 12 gear teeth go past the drivepinion six times to get the contact patterns.Repeat if needed to get a clearer pattern. Figure4.344. Look at the contact patterns on the ring gearteeth. Compare the patterns to Figures 4.35,4.36 and 4.37.• The location of good hand-rolled contact patternsfor new gear sets is toward the toe ofthe gear tooth and in the center between thetop and bottom of the tooth. Figure 4.35.• When the differential is operated, a good patternwill extend approximately the full lengthof the gear tooth. The top of the pattern willbe near the top of the gear tooth. Figure 4.38.• The location of a good hand-rolled contactpattern for an old gear set must match thewear pattern in the ring gear. The new contactpattern will be smaller in area than theold wear pattern.1 - High PatternFigure 4.361 - Low PatternFigure 4.37MAINTENANCE MANUAL31