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Sec, 17
Page 190
GM COACH MAINTENANCE MANUAL
TRANSMISSION
tilted for installation.
It is also a good plan to
temporarily wire the two large gears together to
hold them in place while installing shaft.
12.
Press bearing (83) into retainer (90), then
install the assembly on main drive gear (85).
13. Install lock washer (88)
and nut (87).
Tighten nut securely and bend tangs of lock wash-
er over flats of nut.
OIL PUMP (Fig. 1)
Oil pump may be readily assembled in follow-
ing manner:
1. Insert hexagonal drive shaft (51) in end of
countershaft (56).
2. Install gasket ana oil pump housing (52)
over studs and drive shaft.
3. Install driye gear (50)
in housing, with
drive bushing end of gear over drive shaft.
4.
Press driven gear shaft (46) into cover
(44) if
it
nas been removed.
5. Assemble driven gear (48) over shaft (46).
6.
Fill cover and housing with lubricant and
assemble cover with gasket to housing.
7. Install nuts with lock washers and tighten
securely.
8. Fill pressure relief valve hole with lubri-
cant and rotate drive shaft (51) in proper direc-
tion while filling until all passages are filled with
lubricant, and air is displaced. Unless oil pump
is filled with lubricant, it may not pick up when
first started, thereby chances of damage to trans-
mission through lack of lubricant are increased.
9. Install pressure relief valve ball (39) spring
(40) and plug (41).
10.
Lock plug with lockwire.
ANGLE DRIVE GEAR AND SHAFT (Fig.1)
1. Install drive gear straight roller bearing
(26) on shaft. Be sure bearing seats firmly against
gear.
2. Install spacer (24), speedometer drive gear
(21), inner tapered roller bearing cone (201, spacer
(15) and original shim pack (12).
3. Install bearing cups (18 and 20) in retainer
( 19).
Be sure cups are
firmly seated against
shoulder of retainer.
4.
Place retainer with bearing cups over in-
ner tapered bearing cone (20) and install outer
tapered bearing cone ( 18).
5. Install propeller shaft flange (11) and nut.
Tighten nut securely.
6. Correct bearing adjustment will allow re-
tainer (19) to turn freely but not spin.
Increase
or decrease shim pack (12), between
bearing
cones, as necessary to provide correct bearing
adjustment.
7.
Remove nut (10), propeller shaft flange (11)
and retainer (19) with outer bearing (18). Protect
shim pack (12) so
it
will not be disturbed until
assembled in case.
8. Install straight roller bearing outer race
(26) and snap ring (25) in angle drive case if they
have been removed.
9.
Place bevel gear and shaft (28) in position
in angle drive case (23) and install retainer (19)
with original shim pack (17) and outer bearing
(18).
Do not install bearing cap
(2).
10. Install
propeller shaft flange {11)
and
tighten nut (10) securely.
TRANSMISSION MAIN CASE COVER
(Refer to Fig. 7)
1. Install first, second and reverse shaft (17)
and lever ( 15) into cover (13), assembling shift
finger key, shift finger (19), finger clamp screw,
washer (29),
reverse
lock-out spring (28) and
washer (27) as shaft is moved into position. Re-
fer to figure 7 for position and relation of parts.
2. Install solenoid shift lever collar (25), and
pin (24) in end of shaft.
3. Install third and fourth speed shift shaft
(10) and lever (12) into cover and assemble finger
key, shift finger (9) and clamp screw.
4. Insert third and fourth speed rod poppet
spring, plunger and poppet in cover (13).
Third
and fourth rod is upper rod in figure 7, or right-
hand rod when transmission is installed in vehicle
and may be identified by three poppet notches
closely
spaced with recesses for fork
clamp
screws nearer poppet notches.
5. Insert 3rd and 4th speed rod (7) into cover
(13) assembling spacer (14) and fork (8) as shown
in figure 7, as rod is moved into position.
6. Install fork clamp screws and tighten se-
curely.
7. Shift 3rd and 4th speed rod into neutral,
install interlock pin (5) moving it down to rod ( 7).
8. Insert 1st and 2nd speed rod poppet spring,
plunger and poppet in cover (13).
First and 2nd
rod is center rod and may be identified by three
poppet notches closely spaced with recesses for
fork clamp screws farther away from
poppet
notches.
9. Insert 1st and 2nd rod (4) into cover as-
sembling fork (18) and spacer {31) as shown in
figure 7 as rod is moved into position.
10. Install fork clamp screw and tighten se-
curely.
11. Shift 1st and 2nd speed rod into neutral,
install interlock pin (3) and move
it
down to rod
(4).
12. Insert reverse rod poppet spring, plunger
and poppet into cover.
Reverse rod is bottom or
left-hand rod and may be identified by having only
two poppet notches.
13. Insert reverse rod {2) into cover assem-
bling fork (20) and spacer (30), as shown in fig-
ure 7, as rod is moved into position.
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