Chevrolet 70 Series 1970, Service Manual

Page: 636 / 841

TRANSMISSIONS AND CLUTCHES 7-37
Figure 2 —Coble Type Auxiliary Transmission Linkage
3. Adjust the length of each control rod by
rotating its adjustable c le v is to provide a fr ee
c le v is pin fit.
4. R econnect control rods to the sh ift control
tow er and shift tr a n sm issio n through entire shift
pattern.
NOTE: At the extrem e control rod m ovem ents,
c le v is pins should rotate fr e e ly . Readjust linkage
if n e c e ssa r y to obtain th ese conditions. R eplace
any worn o r damaged cotter p in s. Tighten lock
nuts fir m ly .
5. Lubricate control linkage a s d escrib ed in
LUBRICATION (SEC. 0) of th is manual.
CABLE TYPE LINKAGE ADJUSTMENT
(R efer to F ig . 2)
P erform the follow ing with cab tilted:
1. P o sitio n sh ift rods on au xiliary tr a n sm is­
sio n in m iddle poppet position (Neutral).
2. With the gearsh ift le v e r held perpendicular
(90 degrees) to the control isla n d shift m echanism
a s shown, by an a ssista n t, adjust the length of each
sh ift cable to retain the above m entioned conditions.
NOTE: Adjustment at control isla n d is made
by repositioning NUTS "A" and NUTS "B" a s r e ­
quired. Adjustment may a lso be made at the aux­
ilia r y tr a n sm issio n by repositioning NUTS "C"and
NUTS "D" as n e c e ssa r y .
3. Check adjustm ent by moving gearsh ift le v e r
through the shift pattern. There m ust be no binding
in the linkage.
NOTE: Due to the construction of internal
com ponents in the tr a n sm issio n it may be n e c e s ­
sa r y to road te s t the v e h icle to check the entire
sh ift pattern. At the extrem e sh ift cable m ove­
m en ts, c le v is p in s should rotate fr e e ly . Readjust
linkage if n e c e ssa r y to obtain th e se conditions.
5. R eplace any worn o r dam aged co tter p in s.
AUXILIARY TRANSMISSION
REPLACEMENT
REMOVAL
1. D rain lubricant from auxiliary tr a n s m is ­
sio n .
2. D iscon n ect p r o p eller shafts from input and
output ends of tr a n sm issio n . R efer to "PROPEL­
LER SHAFTS" (SEC. 4D) in th is manual.
NOTE: Support p r o p eller sh afts s e c u r e ly , to
prevent dam age from dropping.
3. D isconnect sh ift control rods o r cab les
fro m the front of the tra n sm issio n .
4. D iscon n ect sp eed om eter cab le from adap­
te r at re a r of the tr a n sm issio n .
NOTE: Som e m odels have the sp eed om eter
d rive mounted on the front a x le in stead of at r ea r
of tra n sm issio n .
5. D iscon n ect parking brake linkage (when
used).
6. R em ove a ll connections to the au xiliary
tra n sm issio n pow er ta k e-o ff (when u sed ).
7. P o sitio n a su itab le dolly o r jack under the
CHEVROLET SERIES 70-90 HEAVY DUTY TRUCK SHOP MANUAL