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GM COACH MAINTENANCE MANUAL
A HIGH NARROW CONTACT
is not desirable. If gears are
permitted to operate with an
adjustment of this kind, noise,
galling and rolling over of
top edge of teeth will result.
To
obtain correct contact,
move
pinion
toward bevel
gear.
This lowers contact
area to proper location. This
adjustment will decrease the
backlash which may be cor-
rected by moving bevel gear
away from pinion.
A SHORT TOE CONTACT is
not desirable.
If
gears are
permitted to operate with an
adjustment of this type, chip-
ping at tooth edges and ex-
cessive wear due to small
contact area will result.
To
obtain correct contact, move
drive gear from pinion. This
will increase the lengthwise
contact and move contact to-
ward heel of tooth.
Correct
backlash is obtained by mov-
ing pinion toward bevel gear.
A
CONTACT
ADJUSTMENT
B
BACKLASH
CORRECTION
A
CONTACT
ADJUSTMENT
B
BACKLASH
CORRECTION
A LOW NARROW CONTACT
is not desirable.
If gears
are permitted to operate with
an adjustment of this type,
galling,
noise and grooving
of teeth will result. To obtain
correct contact, move pinion
away from drive gear.
This
will raise
contact area to
proper location.
A
correct
backlash is obtained by mov-
ing bevel gear toward pinion.
A SHORT HEEL CONTACT
is not desirable.
If gears
are permitted to operate with
an adjustment of this type,
chipping, excessive wear and
noise will result.
To obtain
correct contact, move drive
gear
toward pinion to in-
crease lengthwise contact and
move contact toward toe.
A
correct backlash is obtained
by moving pinion away from
drive gear.
Figure 8-Gear Tooth Contact Chart
Sec. 2
Page 25
REAR AXLE
A
CONTACT
ADJUSTMENT
B
BACKLASH
CORRECTION
A
CONTACT
ADJUSTMENT
B
BACKLASH
CORRECTION
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