GMC 4000 Series Service Manual page 456

10. If vehicle is equipped with power take-off
remove unit and controls from transmission.
Place protective covering over opening.
11. Position a suitable dolly or jack under
the vehicle and adjust to carry the weight of the
transm ission.
12. Visually inspect to determine if other
equipment, lines or brackets must be removed
to permit removal of the transmission.
13. Remove flywheel
transm ission-to-flyw heel housing mounting bolts.
IMPORTANT: Be sure to support the clutch
release bearing and support assembly during
removal of the transm ission from the flywheel
housing. This will prevent the bearing and sup­
port assembly from falling out of the flywheel
housing when the transm ission is removed.
14. Move the transm ission assembly straight
away from the engine, using care to keep the
transm ission main drive gear shaft in alignment
with the clutch disc hub.
IMPORTANT: When removing the transm is­
sion, do not allow the weight of the transmission
to hang on the clutch disc hub, as the disc
will become distorted, seriously affecting clutch
operation.
15. When the transm ission is free from the
engine, lower the transm ission and move from
under the vehicle.
16. If desired, a careful check of clutch
components should be made after the transm is­
sion has been removed. If the clutch requires
repair, refer to "CLUTCHES" (SEC. 7E) in this
manual before transm ission is reinstalled in the
vehicle.
INSTALLATION
1. Apply a light coating of high temperature
grease, symbol S-27, to the main drive gear
bearing retainer and splined portion of trans­
m ission main drive gear shaft to assure free
movement of clutch and transm ission components
during assembly. Refer to LUBRICATION (SEC.
0) of this manual for explanation of High Tem­
perature Grease, symbol S-27.
2. Shift the transm ission into high gear.
3. Mount transmission on dolly or jack and
move into position under the vehicle.
4. Position the clutch release bearing and
support assem bly inside the flywheel housing.
Be sure the clutch release fork properly engages
the clutch release bearing.
5. Align the transmission main drive gear
shaft with the clutch disc hub by rotating the
transm ission companion flange. Move the trans­
m ission forward, guiding the main drive gear
shaft into the clutch disc splines.
IMPORTANT: Avoid
when the transm ission is being installed to the
G M C S E R V I C E M A N U A L
h o u s i n g pan and
springing the clutch
TRANSMISSION ON-VEHICLE SERVICE
GEARSHIFT LEVER
n \
TRA N SM ISSIO N COVER)
Figure 1 — Replacing Gearshift Lever
engine. Do not force the transm ission into clutch
disc splines. Do not let transmission drop or hang
unsupported in the splined hub of the clutch disc.
6. Install transm ission-to-flywheel housing
mounting bolts and washers.
NOTE: Tighten bolts to 60-65 foot-pounds
on New Process transm issions and 60-90 foot­
pounds on Corporation SM465 transmissions.
7. If vehicle is equipped with power take-off
reinstall unit and controls on transmission.
8. Install engine ground strap and battery
cable support clip, if attached to transm ission
or clutch housing.
9. Connect propeller shaft to transmission
as described in "PROPELLER SHAFTS" (SEC.
4D) of this manual.
10. Connect parking brake lever and controls
(if used). Adjust brake as outlined in "PARKING
BRAKE" (SEC. 5C) of this manual.
11. Reconnect clutch control linkage. Install
flywheel housing pan. Tighten capscrews firmly.
12. Reconnect speedometer cable to adapter
at transmission.
13. If other equipment (exhaust pipe, sup­
port brackets, etc.) was removed, reinstall these
parts.
14. On conventional
models, shift the transm ission into "NEUTRAL."
Install gearshift lever using tool (J-8109) as
shown in figure 1. P ress down firmly and rotate
clockwise to install gearshift lever.
15. On tilt cab models, reconnect shift con­
trol rods to the shift levers on the transmission
remote control assembly.
16. Refill transmission with lubricant recom­
mended in "LUBRICATION"
manual.
Sec. 7B
Page 445
TOOL
LEVER RETAINER
cab or s c h o o l bus
(SEC. 0) of this