GMC PD-4103 Maintenance Manual page 213

GM COACH MAINTENANCE MANUAL
Sec. 17
Page 193
INSTRUCTIONS
1-lnstall mainshaft and angle drive output shaft
assemblies; then adjust pinion and bevel gear for
proper backlash as directed in "Adjustments" para-
graph of this section.
2-Paint three of four teeth of bevel gear on output
shaft with red lead or mechanics' blue and rotate
pinion until bevel gear makes complete revolution.
3-Note area of tooth contact which should start at
toe and extend about 80 percent of tooth length
toward heel, as at B.
4-Vary position of pinion and gear as per chart
until proper tooth contact is obtained. Be sure that
sufficient backlash has been allowed so that gear
can be completely revolved without any highspots
being felt.
.E
cw
.Q ...
't
0
Q)
._ C
'ii ~
0
"'..c ~;
C 0
·-·.;::
C
'ij
0 C
:5 8
0.
Q)
't
>
~
~8
Move gear in this direction to
correct condition shown at C .
Move gear in this direction to
correct condition shown at D.
WORKl!:~:;E
~ F L A N K
BACKLASH
A'
DRIVE SIDE THICK END
COAST SIDE
Figure 9-Angle Drive Gear Tooth Contact Chart
TRANSMISSION
A-Check adjustments at drive side of
bevel gear tooth.
B-Shows correct tooth contact.
C-Shows short contact at heel. To cor-
rect, move gear toward pinion. Then
move pinion away from gear to again
secure correct backlash.
0-Shows short contact at toe. To cor-
rect, move gear away from pinion. Then
move pinion toward gear to again se-
cure correct backlash.
E-Shows heavy contact on Aank or
lower portion of tooth. To correct, move
pinion away from gear until contact
comes to full working depth of gear
tooth without breaking contact at Aank.
Then move gear toward pinion to secure
correct backlash.
F-Shows heavy contact on face or
upper portion of tooth. To correct, move
pinion toward gear until contact covers
Aank of tooth without breaking contact
at face. Then move gear away from
pinion to secure correct backlash.
TP 0911