Power Train Disassembly & Assembly
Hypoid Generoid Gears
Good Hand-Rolled Pattern
High Pattern
Low Pattern
4. Look at the contact patterns on the ring gear teeth.
Compare the patterns to Figures above.
The Location of Good Hand-Rolled Contact
patterns.
New Conventional and Generoid Gear Sets –
toward the toe of the gear tooth and in the center
between the top and bottom of the tooth.
When the carrier is operated, a good pattern will
extend approximately the full length of the gear
tooth. The top of the pattern will be near the top of
the gear tooth.
The location of a good hand-rolled contact pattern
for an old gear set must match the wear pattern in
the ring gear. The new contact pattern will be
smaller in area than the old wear pattern.
If the contact patterns require adjustment, continue
by following step 5 to move the contact patterns
between the top and bottom of the gear teeth, If
the contact patterns are in the center of the gear
teeth, continue by following step 6.
5. Change the thickness of the shim pack under
bearing cage to move contact patterns between
the top and bottom of the gear teech. Use the
following procedre.
NOTE : Ahigh contact pattern indicates that the drive
pinion was not installed deep enough into the carrier.
Alow contact pattern indicates that the drive pinion
was installed too deep in the carrier.
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