(3) Remove rod bolt from bracket, pull rod
track rollers and drive sprocket. Leave enough track
bolt out of adjusting block, then remove and separate
protruding beyond drive sprocket in such a way that end
the two springs.
of track can be lifted up around sprocket.
Note. At installation, position adjusting nut
Note. Be sure roller flanges are directly
and spring control nut on rod bolt at their
above track.
(2) Lower jack and crawler frame until lower
approximate positions when rod bolt was removed
track rollers rest properly on track.
above.
(3) Pull ends of track up and around sprocket,
(4) Install in reverse order.
and over upper track roller until ends meet, install
b. Cleaning, Inspection, and Repair.
bushing in link, install spacers, then install master pin.
(1) Clean all parts in an approved cleaning
(4) Remove jack from crawler frame.
solvent and dry thoroughly.
(2) Visually inspect mounting hardware for
track.
burs, or stripped threads. Inspect springs for loss of
3-142. Upper Track Support Rollers
tension (no space between coils) or breaks.
a. Removal and Installation.
(3) Repair by replacing damaged mounting
(1) Provide slack for removal of upper
hardware, or a weak or broken spring.
support rollers by loosening the adjusting nuts (fig. 3-
3-144. Drive Chain
a. Removal and Installation.
(2) Remove two nuts, lockwashers, and bolts
(1) Remove lockpin (fig. 3-127) from pin in
from roller pin.
drive chain, and drive pin from chain link.
(3) Raise track assembly with a long pry bar,
(2) If necessary to give slack, remove two
insert blocking between track and crawler frame to
capscrews and lockwashers from lockplate on
provide clearance for removal of roller.
adjustment block, remove lockplate, then turn adjusting
(4) Drive out pin and remove roller.
bolt until chain has enough slack to allow pins easy
(5) Remove remaining rollers in a similar
removal.
manner.
(3) Loosen adjusting nuts on two eyebolts one
(6) Install in reverse order.
on inside the other on outside of frame.
(7) Adjust track (para 3-41).
(4) Remove drive chain.
b. Cleaning, Inspection, and Repair.
(5) Remove remaining drive chain in similar
(1) Clean all parts with an approved cleaning
manner.
solvent and dry thoroughly.
b. Cleaning, Inspection, and Repair.
(2) Visually inspect rollers and pins for wear
(1) Clean all parts in an approved cleaning
or breakage. Inspect mounting hardware for burs,
solvent and dry thoroughly.
stripped threads, or other damage.
Inspect roller
(2) Visually inspect each link of chain for bent
mounting brackets for cracks, or breaks.
link, worn link rollers, bent pin, or excessively worn
(3) Repair by replacing defective mounting
chain.
hardware, worn roller pins, or welding cracks or breaks
(3) Repair by replacing worn or bent links,
in mounting brackets.
Replace damaged rollers.
pins, or rollers. Replace the complete chain when wear
Damaged or defective rollers will be forwarded to direct
appears to be equal, but excessive throughout its entire
support maintenance for repair.
length.
3-143. Track Idler Adjusting Springs
c. Adjustment.
After installation, refer to
a. Removal and Installation.
(1) Remove cotterpin and nut (fig. 3-126)
3-145. Mud Guard
from end of rod bolt. Remove cotterpin from nut at end
a. Removal and Installation.
or spring, and move nut toward adjusting block until
(1) Remove track (para 3-141).
tension on springs is relieved.
(2) Remove 20 nuts (fig. 3-126) then remove
(2) Remove adjusting nut at end of rod bolt
mud guard.
and backoff the one on other side of adjusting block until
(3) Remove remaining mud guard in similar
rod bolt will come out of bracket at end of springs.
manner.
(4) Install in reverse order.
b. Cleaning, Inspection, and Repair.
(1) Clean all parts with an approved cleaning
solvent and dry thoroughly.
(2) Visually inspect mud guard for bents,
cracks, or other damage.
3-135
