Service Manual
Section
V
8-SPEED TRANSMISSION
DESCRIPTION
The 8-speed transmission
is
an all-gear transmis-
sion utilizing sliding gears and splined shafts for easy
shifting. All shafts operate on needle or ball bearings
supported by the transmission case, which consists of
R.H.
and L.H. cast iron case halves, dowelled for
alignment and bolted securely together.
The
transmission features high and low range se-
lection. Low range provides an additional
4
to
1
re-
duction in each of the
3
speeds
forward and also re-
verse.
Remove the pilot studs one at a time, replacing
them with cap screws. Tighten all six cap screws
se-
curely. ,Connect brake linkage. Install dust cover, in-
struction plate, fender and seat assembly, drive belt,
belt
guard, foot rest, etc.
Fill
the transmission to proper level with S.A.E. 140
A.P.I. Service GL-5 gear oil. Remove support from
beneath tractor frame. Test tractor operution.
RATIOS
8-SPEED TRANSMISSION
Gear
High
Range
low
Range
1st gear 66.8 to
1
267.2 to
1
Disassembly:
2nd gear 42.4 to 1
169.6 to
1
3rd
gear 24.6 to 1
98.4 to
1
1.
Remove axle hubs and input pulley.
Reverse
51.5
to 1
206.0
to
1
2.
Place the transmission assembly in a vise or
REMOVAL AND
REPLACEMENT
suitable holding fixture, as shown in Figure
1
(shown with levers, brake band, brake drum,
Removal:
hubs, and input pulley removed).
These basic instructions apply to all tractors equip-
ped with 8-speed transmissions. Deviate from them
as necessary for any particular tractor.
Remove mid-mounted or trailing attachments, or
hitches which might interfere with transmission re-
moval. Support the tractor frame ahead of the trans-
mission just enough that the rear wheels no longer
carry any weight.
Remove the
R.H.
foot rest, belt guard and
belt.
Disconnect the brake rod or remove the brake band
from the anchor bracket. Remove the fender and seat
assembly, the dust cover and instruction plate located
just ahead of the shift levers.
Remove the cap screws that fasten through the
bottom of the tool box into the top of the transmis-
sion. Remove four cap screws that go through the
frame butt plate into the front of the transmission.
Lower the front of the transmission, guide the shift
levers down between the frame rails, and roll the
transmission and wheel assembly free of the tractor.
Drain lubricant, remove wheels, and clean the trans-
mission as necessary before disassembling.
Installation:
NOTE:
It
is
recommended that two pilot studs be
used to facilitate transmission installation. To make
the studs, cut the heads
off
of two
3/8"-16
x
2"
hex
head or carriage bolts. Grind a taper on the un-
threaded end of each bolt. Screw the studs into diag-
onally opposite upper and lower tapped holes in the
front of the transmission case.
Install input pulley, axle hubs and wheels. Move
the transmission assembly into place and guide the
pilot studs with the corresponding holes in the frame
shift levers up between the frame rails. Align the
butt plate and push the transmission firmly against
the
plate. Install cap screws in the top of the trans-
mission and the open holes at the front and tighten
them until snug.
-
45
-
FIGURE
1
3.
Place the shift lever in neutral and pull the shift
lever rubber boot from the transmission boss.
Loosen the shift lever retaining lock nut and set
screw and remove the shift lever.
range lever.
4.
Remove the roll pin and remove the high-low
5.
Remove the two
(2)
brake band retaining bolts
and remove the brake band.