Differential

c.BACKLASH ADJUSTMENT

The backlash for a given pair of spline shaft (pinion gear) and bevel (ring or crown) gear is determined at the factory and is etched on the outer surface of the bevel gear. Adjust backlash to the etched number ± 0.05 mm (0.002"), preferable toward the lower limit.

NOTE: The backlash is adjusted by removing shims from one carrier on transmission case and fitting them to other side. The same quantity of shims must be maintained at all time as otherwise the “PRE-LOAD” of the tapered roller bearing will be upset.

1.Rigidly mount a dial indicator against a gear tooth, being sure that indicator system is perpendicular to the tooth surface at the extreme heels.

2.Engage two sliding gears in mesh this will held the position quite but a pinch bar used as a lever against one of the teeth of the gear will ensure complete rigidity.

3.Rock the bevel gear noting total indicator reading.

4.Repeat measurement every 90º of the bevel gear.

5.Excessive backlash is reduced by removing shims from the right hand bull pinion bearing cage and assembling them to the left hand bull pinion bearing cage and vice-versa. A 0.005" shim transfer approximates to a reduction or increase of 0.003" backlash.