Chevrolet 70 1969 Series, Shop Manual

Page: 796 / 913

lug ( II) , and from 1st and reverse shift lug (3).
12. Remove 1st and reverse shift rod (6), rocker lug (11),
and shift lug (3).
13. Remove cotter pin from the end of 1st and reverse
latch plunger (fig. 11 or 12).
14. Remove nut from end of latch plunger; then remove
latch plunger and spring from well in 1st and reverse
shift lug (fig. 11 or 12).
15. Remove nut and lock washer from 1st and reverse
rocker arm pin (at top side of cover), then remove
pivot pin (12) and rocker arm (15) from bottom side
of housing.
M A IN S H A F T D IS A S S E M B L Y
Key numbers in text refer to Figure 13 unless otherwise
specified.
1. Remove the 4th and 5th speed synchronizer assembly
(8) from the mainshaft (43).
2. Remove 1st and reverse sliding gear (42) from m ain­
shaft; then place balance of the assembly in a vise
with copper or brass jaws so splines will not be dam ­
aged. The assembly should be positioned in vise with
the front end up.
3. U sin g snap ring picks (J-8461-1), remove snap ring
(9) holding the 4th speed gear (13) to mainshaft (43).
4 Turn 4th speed gear retaining washer (10) to align in­
ternal splines of mainshaft (43) and remove the wash­
er (10).
5. Remove the 4th speed gear (11) from mainshaft (43).
6. Remove mainshaft assembly from vise and with the
front end pointed down, lightly pound the assembly
against a block of wood. This will cause weight of 3rd
.‘peed gear (14) to force 4th speed gear bushing sleeve
(12) off mainshaft (43). After bushing sleeve has loos­
ened, remove it with 4th speed gear locating washer
(13) from shaft. W hen bushing is removed the locat­
ing pin will come off shaft. C are should be used not
to lose the pin (7).
7. Remove 3rd speed gear (14), thrusi washer (15), an’d
2nd and 3rd synchronizer assembly (16).
8. Remove 2nd speed gear retaining ring (17), washer
(18), and 2nd speed constant mesh gear (51) from
mainshaft (43).
9. Remove 2nd speed gear bushing sleeve (49), and lo­
cating washer (48) from mainshaft (43).
C O U N T E R SH A F T D IS A S S E M B L Y
Key numbers in text refer to Figure 13 unless other
wise specified.
1. Remove snap ring (5) from front end of the counter­
shaft (52).
2. Position countershaft assembly in an arbor press and
press countershaft drive gear (4) from shaft. Remove
W oodruff key (89) from slot in countershaft (52).
3. Remove drive gear spacer (84). Rem ove 4th speed
gear (85), and 3rd speed gear (86) in same manner
used to remove the drive gear (4).
4. Rem ove two remaining W ood ru ff keys (89) from
countershaft (52).
TRANSMISSION AND CLUTCH 7-50
M A IN D R IV E G E A R A N D B E A R IN G
D IS A S S E M B L Y
1. Place drive gear assembly in a vise having copper or
lead jaws so gear teeth will not be damaged.
2. Rem ove jam nut or snap ring (78) retaining bearing
assembly (77) on drive gear (76).
3. U sin g bearing remover plates (J-8176) and an arbor
press, remove drive gear bearing (77) from drive gear
(76).
CLEANING, INSPECTION, AND REPAIR
(Refer to Figures 2, 3, 8, and 13)
C L E A N IN G
D u rin g overhaul procedures all components of the
transm ission (except bearing assemblies) should be tho­
roughly cleaned with cleaning solvent and dried with air
pressure prior to inspection and reassembly of the trans­
mission.
1. Clean the bearing assemblies as follows:
a. Careful and proper cleaning of bearings is of ut­
most importance. Bearings should always be
cleaned separately from other parts.
b. S o a k all bearing assemblies in C L E A N cleaning
solvent. Gasoline is not recommended. Bearings
should never be cleaned in a hot solution tank.
c. Slush bearings in solvent until all old lubricant
is loosened. H o ld bearing races so bearings will
not rotate; then brush bearings with a soft bristled
brush until A L L D I R T has been removed. R e ­
move loose particles of dirt by striking bearing
flat against a block of wood.
d. Rinse bearings in clean solvent; then blow bear­
ings dry with air pressure. D O N O T S P I N
B E A R I N G S W H I L E D R Y I N G .
e. Rotate each bearing slowly while exam ining balls
or rollers for roughness, damage, or excessive
wear. Replace all bearings that are not in first
class condition.
N O T E : A fte r c le a n in g a n d in sp e c tin g b e a rin g s
a s directed, lubricate b e a r in g s g e n e ro u sly w ith
lu b rican t re c o m m e n d e d in L U B R IC A T IO N (SE C .
10) of this m a n u a l; the n w r a p e ach b e a r in g in
clean p a p e r until re a d y to reinstall in tra n sm is­
sion.
2. Rem ove all portions of old gaskets from parts,
using a stiff brush or scraper.
IN S P E C T IO N
1. Inspect rods and shafts for evidence of fatigue. Check
bearing surfaces for scoring or wear.
2. Inspect all parts for discoloration or warpage due to
heat.
CHEVROLET SERIES 70-80 HEAVY DUTY TRUCK S H O P M A N U A L