1029 / 1906
FRONT AXLE (4X4)
31
INTERPRETATION OF CONTACT PATTERN
1. The TOE of the gear is the portion of the tooth surface at the end towards the center. The HEEL of the
gear tooth is the portion of the tooth surface at the outer-end. The TOP LAND of a gear tooth is the
surface of the top of the tooth. Every gear has a characteristic pattern.
PATTERN INTERPRETATION
(RING GEAR)
FACE HOBBING
DRIVE SIDE
HEEL TOE
CONDITION
COAST SIDE
TOE HEEL
CONDITION
ACTION
REQUIRED
Desirable pattern.
The
drive pattern should be
centered on the tooth.
There should be some
clearance between the
pattern and the top of
the tooth.
Desirable pattern.
The
coast pattern should be
centered on the tooth, but
may be slightly toward
the toe. There should be
some clearance between
the pattern and the top of
the tooth.
None
Top toe contact
Top heel contact
Backlash
correct.
Thicker pinion
position shim
required.
Root heel contact
Root toe contact
Backlash
correct.
Thinner pinion
position shim
required.
Top heel contact
Top toe contact
Pinion position
shim correct.
Decrease
backlash.
Root toe contact
Root heel contact
Pinion position
shim correct.
Increase
backlash