Chevrolet 70 1969 Series, Shop Manual

Page: 830 / 913

TRANSMISSION AND CLUTCH 7-84
eventually. Y our own operating experience will dictate
mileage replacem ent of bearings showing only nomal
wear.
SH AFTS FITS
Excessive looseness under load is very objectionable be­
cause it produces a creeping or slipping of the inner ring
on the rotating shaft. This causes the surface m etal of
shafts to scrub or wear off.
Bearing fits on rotating shafts are usually specified as
tight. W hen play or looseness, even .001” , exists between
the bearing and shaft, there is a very powerful force tend­
ing to rotate the inner race on the shaft; this force is
caused by the looseness or lost m otion between the parts
and disappears when no looseness exists.
BEARING REPLACEMENT
It is far m ore difficult to remove bearings from a shaft
than to put them on. In m ost cases it is necessary to re­
move the bearing by pulling on the outer-race which can
dam age the balls or races. Since such dam age is seldom
visible, it does not become known until after com plete
reassembly. If a bearing is not going to be replaced, avoid
removal during low mileage rebuild.
Brinelling caused by im proper assembly or removal -
usually ham m ering with off-center blows. Use drivers
under an arbor.
DISASSEMBLY INTO SUBASSEMBLIES
REMOVAL OF CONTROL TOWER
(Key N u m bers Refer to Figure 4)
N O T E : C ontrol to w e r is u sed only on c o n v e n ­
tion al c a b m odels.
1. Rem ove plunger retainer (15), plunger spring (14) and
plunger (13).
2. Rem ove cap screws (20) and washers (19) retaining
the control tower assembly to the shifter housing (12).
IM P O R T A N T : W h ile re m o v in g control to w e r in
the fo llo w in g step use care to pre ven t the
Shift Ro d
Poppe t S p rin g s
1 st a n d Reverse
f I lj| " Shift Fin ge r
1
L \
r
Retainer
Ti}
P lu n g e r
f ,
Pin Sp rin g
P lu ng er Pin
Tran sm ission
ifter H o u sir
A s s e m b ly
Shifter H o u sin g
F ig u re 2 — R e m o te C o n tro l A s s e m b ly
( U s e d o n Tilt C a b M o d e ls )
p lu n g e r (1 6 ) from fa llin g ou t o f the 1st a n d
reverse sh ift fin g e r (9) a n d into the b ottom of
th e tran sm ission .
3. C a re fu lly lift control to w e r (6 ) o ff th e sh ift­
er h o u sin g . R e m o ve a n d d isc ard g a s k e t (1 1 ).
REMOVAL OF REMOTE CONTROL
ASSEMBLY
(Refer to Figure 2)
Figure 3 — R em o v in g Reverse Idler G e a r S haft
CHEVROLET SERIES 70-80 H EAVY DUTY TRUCK S H O P M A N U A L