Service Manual
Section
II
5053
-
5058
3-SPEED UNlDRlVE
DESCRIPTION
The 3-speed unidrive transmission
is
an all-gear Model 5053 covers all standard models
(5007,
transmission utilizing sliding gears and splined shafts
5025, 5046, 5048, 5049,
and
5053)
equipped with
for easy shifting.
All
shafts operate on needle or ball the spur gear differential.
bearings supported by the transmission case. The
transmission case consists of R.H. and L.H. cast iron Model
5058
covers all heavy duty models
(5045,
case halves which are dowelled for alignment and
5047, 5051, 5059,
and
5058)
incorporating the bevel
bolted securely together. gear differential.
The model numbers 5053 and
5058
used in
this
section stand for the full line
of
unidrive transmis-
sions produced since
1961.
1st
gear
...............
66.8
to
1
2nd gear
..............
42.4
to
1
3rd
gear
...............
24.6
to
1
Reverse
................
51.5
to
1
REMOVAL AND REPLACEMENT
Removal:
These basic instructions apply to all tractors
necessary to gain clearance, remove
the
dust cover
equipped with Unidrive transmissions. Deviate from
and instruction plate located just ahead of the shift
them as necessary for any particular tractor.
lever.
Remove mid-mounted or trailing attachments, or
Remove two cap screws that fasten through the
hitches
which might interfere with transmission re-
bottom of the tool box into the top of the transmis-
moval. Support the tractor frame ahead of the trans-
sion. Remove four cap screws that go through the
mission just enough that the rear wheels no longer
frame butt plate into the front of the transmission.
carry any weight.
Lower the front of the transmission, guide the shift
lever down between the frame rails, and roll the
remove the R.H. foot
rest,
if
so
equipped,
belt
transmission and wheel assembly
free
of the tractor.
guard, and belt. Disconnect the brake rod or remove
the brake band from the anchor bracket. On most Drain lubricant, remove wheels, and clean trans-
models, remove the fender and seat assembly.
If
mission as necessary before disassembling.
Installation:
NOTE:
It
is
recommended that two Pilot studs
be
case. Put the other one in
the
diagonally opposite
used to facilitate transmission installation. To make lower
hole.
the studs, cut the heads off of two
3/8"-16
x
2"
hex
head or carriage bolts. Grind a taper on the un- Install input pulley, axle hubs and wheels. Move
threaded end of each bolt. Screw one stud into one
the transmission assembly into place and guide the
of the upper holes in the front of the transmission
shift lever up between the frame rails. Align the pilot