Diagnostic Routine Chart

Diagnostic Routine Chart

5. NOTE: If the conclusion of the road test points to an axle center section (ring and pinion or differential case) concern, carry out a visual inspection of the rear axle.

Inspect the axle components.
1. Remove the axle assembly.
2. Remove the differential housing cover. Drain the axle lubricant through a white cloth. Check the fluid for:
any foreign material.
metal particles.
burnt odor.

3. NOTE: When inspecting the axle, do not clean the components immediately. Cleaning may remove diagnostic evidence.

Inspect the axle components.
^ Look for:
loose fasteners.
notches or visible steps or grooves created by wear.
pitting or cracking along gear contact lines.
scuffing or deformations.
discolorations.
nicks or ridges on gear teeth.
^ Clean the axle components for inspection.
Remove as much lubricant as possible with clean solvent. Wipe the components or blow them dry with compressed air.
^ Re-inspect for:
loose fasteners.
notches or visible steps or grooves created by wear.
pitting or cracking along gear contact lines.
scuffing or deformations.
discolorations.
nicks or ridges on gear teeth.
^ Check backlash and carry out a ring and pinion pattern test. Refer to Checking Differential Ring Gear Backlash and Checking Tooth Contact Pattern and Condition of the Ring and Pinion.