Chevrolet 70 1969 Series, Shop Manual

Page: 423 / 913

T R A N SM ISSIO N S A N D CLUTCHES 7C-18
SECTION 7C
AUXILIARY TRANSMISSIONS
SPICER MODELS 6041, 7041, AND 7231-A
This section covers on-vehicle service infor­
mation on Spicer Auxiliary Transmissions. Gear
shifting is accomplished by use of the shift lever
in the cab, which is interconnected to the auxiliary
transmission with control rods. The auxiliary
transmission is supported at the front by a support
bracket attached to frame side rails and at the
rear by a support beam attached to frame brackets.
Hand brake (when used) and speedometer drive are
assembled at the rear of transmission.
LINKAGE ADJUSTMENT
(Refer to Figure 1)
1. Disconnect control rods from shift control
tower under cab.
2. Place auxiliary transmission gearshift lever
and shift rods on the transmission in N E U T R A L .
3. Adjust the length of each control rod by ro­
tating its adjustable clevis to provide a free clevis
pin fit.
4. Reconnect control rods to the shift control
tower and shift transmission through entire shift
pattern.
N O T E : At the extreme control rod movements,
clevis pins should rotate freely. Readjust linkage
if necessary to obtain these conditions. Replace
any worn or damaged cotter pins. Tighten lock nuts
firmly.
5. Lubricate control linkage as described in
LU B R IC A T IO N (SEC. 0) of this manual.
Shift Control
Tower
AUXILIARY TRANSMISSION
REPLACEMENT
R E M O V A L
1. Drain lubricant from auxiliary transmis­
sion.
2. Disconnect propeller shafts from input and
output ends of transmission. Refer to "P R O P E L L E R
S H A F T S " (SEC. 4D) in this manual.
N O T E : Support propeller shafts securely, to
prevent damage from dropping.
3. Disconnect shift control rods from the front
of the transmission.
4. Disconnect speedometer cable from adapter
at rear of the transmission.
5. Disconnect parking brake linkage (when
used).
6. Remove all connections to the auxiliary
transmission power take-off (when used).
7. Position a suitable dolly or jack under the
transmission and adjust to safely carry the weight
of the transmission.
8. Remove attaching parts from auxiliary
transmission front and rear mountings. Lower
transmission away from the chassis.
IN S T A L L A T IO N (Refer to Figs. 2 and 3)
The procedures required to install auxiliary
transmission are dependent on the type of trans­
mission mountings which vary due to different
vehicle driveline configurations.
Tower Shift
Rod
CONTROLS AT SHIFT TOWER
Transmission |
Shift Rod
CONTROLS AT TRANSMISSION
TPM 9 152
Figure 1— Typical Auxiliary Transmission Linkage Adjustment
CHEVROLET SERIES 70-80 H EAVY DUTY TRUCK SH O P M A N U A L