TM 5-3820-239-15
Section XIV. TRACTION UNIT
(4) Remove track roller shaft supports
6-90. General
(20) and dust shield assemblies (21).
This section contains repair instructions for
(5) Remove oil seals (26) by cutting
the traction units. The pneumatic drill uses
them with a small sharp chisel and
two traction units, which are identical except
prying out.
for orientation, and quantitites specified
(6) Pry off snap rings (27). Remove lu-
throughout this section are for one unit. All
brication fittings (24) and reducing
illustrations used depict the left-hand traction
bushings (26).
unit.
(7) Support the assembly on flange and
hub assembly (31). Using a heavy
6-91. Removal
hammer and a piece of bronze to
Remove the traction units as described in
protect the shaft, drive out track roll-
er bushing retainers (28).
Note. Remove the retainer closest to
6-92. Disassembly
the lubrication fitting first.
a. General. Disassemble traction unit in the
(8) If necessary to remove track roller
numerical sequence as illustrated on figure
bushings (29), drive a small chisel
6-31. Note the following special procedures:
down along the split line, being care-
ful not to damage any parts.
b. Track Assembly.
(1) If necessary to remove track assembly
d. Track Idler Assembly.
(5, fig. 6-31), tow or propel the
(1) Remove the track assembly (para
pneumatic drill until the track hook-
up pin (7) is at the rear, approxi-
(2) Remove nuts (16) and slide the track
mately half-way up the sprocket
idler assembly and related parts (18)
wheel of the final drive assembly
off track frame channel assembly
(52).
(53).
(3) Remove self-locking nuts (54) and
(2) Pry out track hookup pin lock pins
track roller adjusting forks (55).
(6).
(4) Remove self-locking nuts (56), and
(3) Using a drift of a smaller diameter
slide out assembled buffer spring
than the track hookup pin (7) and
a backup plate to support the grouser,
parts (57 through 60).
drive out the track hookup pin with
(5) After removing support guide plates
a hammer.
(63) and track idler supports (67),
(4) Remove the track assembly either by
remove oil seals (76) by cutting them
hoisting the entire unit, or by pro-
with a small sharp chisel and prying
pelling it until the track is free.
out.
(6) Pry off snap rings (76).
c. Track Roller Assemblies.
(1) Remove the track assembly (para
Note. If necessary to remove track
idler flanges (74), be sure to first re
move lubrication fittings (68) and reduc-
(2) Jack up the frame to allow clearance
ing bushings (69).
for track roller removal.
(7) Support the assembly so that track
(3) Remove self-locking nuts (19) (4 per
idler shaft (79) can be driven out.
roller), and lower the entire track
Install a nut (65) on the shaft to act
roller assembly (23), with track roller
as a driving surface, and drive out
shaft supports (20) and dust shield
track idler bushing retainer (77) and
assemblies (21) attached, until free
bushing (78). Reverse the wheel and
from roller track frame studs (22).
