Gear Contact Pattern Analysis (194 Rbi) - Jeep Cherokee 2000 Service Manual

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ADJUSTMENTS (Continued)

(38) Verify differential case and ring gear runout

by measuring ring to pinion gear backlash at eight

locations around the ring gear. Readings should not

vary more than 0.05 mm (0.002 in.). If readings vary

more than specified, the ring gear or the differential

case is defective.

After the proper backlash is achieved, perform the

Gear Contact Pattern Analysis procedure.

Fig. 77 Ring Gear Backlash Measurement

1 – DIAL INDICATOR

GEAR CONTACT PATTERN ANALYSIS

The ring gear and pinion teeth contact patterns

will show if the pinion depth is correct in the axle

housing. It will also show if the ring gear backlash

has been adjusted correctly. The backlash can be

adjusted within specifications to achieve desired

tooth contact patterns.

(1) Apply a thin coat of hydrated ferric oxide, or

equivalent, to the drive and coast side of the ring

Fig. 78 Backlash Shim Adjustment

(2) Wrap, twist, and hold a shop towel around the

pinion yoke to increase the turning resistance of the

pinion. This will provide a more distinct contact pat-

(3) Using a boxed end wrench on a ring gear bolt,

Rotate the differential case one complete revolution

in both directions while a load is being applied from

The areas on the ring gear teeth with the greatest

degree of contact against the pinion teeth will squee-

gee the compound to the areas with the least amount

of contact. Note and compare patterns on the ring

gear teeth to Gear Tooth Contact Patterns chart (Fig.

79) and adjust pinion depth and gear backlash as

194 RBI AXLE

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