Spicer Tandem Drive Axle Dual Range & Double Planetary 34,000-45,000 lbs - Manual (Page 24)

Adjustments
R ing Gear and Pinion Tooth Contact
NOTE:
Rear axle gearing is shown in the following instructions. Correct
tooth contact patterns and adjustments are the same for
rear axles.
Check Tooth Contact Pattern (NEW GEAR)
Paint twelve ring gear teeth with marking compound
and roll the gear to obtain a contact pattern. The correct
pattern is well-centered on the ring gear tooth with
lengthwise contact clear of the to the Iength of the
pattern in an unloaded condition is approximately one-
half to two-thirds of the ring gear tooth in most models
and ratios.
RING GEAR TOOTH NOMENCLATURE
Check Tooth Contact Pattern (USED GEAR)
Used gearing will not usually display the square,
even contact pattern found in new gear sets. The
gear will normally have a “pocket” at the toward
of the gear tooth which tails into a contact line
along the root of tooth. The more use a gear has
had, the more the line becomes the dominant
characteristic of the pattern.
Adjust used gear sets to display the same contact
pattern observed before disassembly. A correct
pattern is clear of the toe and centers evenly along
the face width between the top land and root.
Otherwise, the length and shape of the pattern are
highly variable and is considered acceptable as
long as it does not run off the tooth at any point.
forward and
CORRECT PATTERN (NEW GEARING)
CORRECT PATTERN (USED GEARING)
●
Pocket may be
extended.
●
Pattern along the
face width
could be longer.
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