(2) Remove adjusting nut at end of rod bolt
c. Installation.
and back off the one on other side of adjusting block
(1) Pull the assembled track under lower track
until rod bolt will come out of bracket at end of springs.
rollers and drive sprocket.
Leave enough track
(3) Remove rod bolt from bracket, pull rod
protruding beyond drive sprocket in such a way that end
bolt out of adjusting block, then remove and separate
of track can be lifted up around sprocket.
the two springs.
Note.
Be sure roller flanges are directly above track.
Note.
At installation, position adjusting nut
(2) Lower jack and crawler frame until lower
and spring control nut on rod bolt at
track rollers rest properly on track.
their approximate positions when
(3) Pull ends of track up and around sprocket,
rod bolt was removed above.
and over upper track roller until ends meet, install
bushing in link, install spacers, then install master pin.
(4) Install in reverse order.
(4) Remove jack from crawler frame.
b. Cleaning, Inspection and Repair.
d. Adjustment. Refer to paragraph 3-37 and adjust
(1) Clean all parts in an approved cleaning
track.
solvent and dry thoroughly.
(2) Visually inspect mounting hardware for
3-135. Upper Track Support Rollers
burs, or stripped threads. Inspect springs for loss of
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. 13) on rod bolt.
3-137. Drive Chain
(2) Remove two nuts, lockwashers, and bolts
from roller pin.
a. Removal and Installation.
(3) Raise track assembly with a long pry bar,
insert blocking between track and crawler frame to
(1) Remove lockpin (fig. 3-114) from pin in
provide clearance for removal of roller.
drive chain, and drive pin from chain link.
(4) Drive out pin and remove roller.
(2) If necessary to give slack, remove two
(5) Remove remaining rollers in a similar
capscrews and lockwashers from lockplate on
manner.
adjustment block, remove lockplate, then turn adjusting
(6) Install in reverse order.
bolt until chain has enough slack to allow pins easy
(7) Adjust track (para 3-37).
removal.
(3) Loosen adjusting nuts on two eyebolts one
b. Cleaning, Inspection and Repair.
on inside the other on outside of frame.
(4) Remove drive chain.
(1) Clean all parts with an approved cleaning
(5) Remove remaining drive chain in similar
solvent and dry thoroughly.
manner.
(2) Visually inspect rollers and pins for wear
(6) Install in reverse order.
or breakage. Inspect mounting hardware for burs,
stripped threads, or other damage.
Inspect roller
b. Cleaning, Inspection and Repair.
mounting brackets for cracks, or breaks.
(1) Clean all parts in an approved cleaning
(3) Repair by replacing defective mounting
solvent and dry thoroughly.
hardware, worn roller pins, or welding cracks or breaks
(2) Visually inspect each link of chain for bent
in mounting brackets.
Replace damaged rollers.
link, worn link rollers, bent pin, or excessive]y worn
Damaged or defective rollers will be forward(-d to direct
chain.
support maintenance for repair.
(3) Repair by replacing worn or bent links,
pins, or rollers. Replace the complete chain when wear
3-136. Track Idler Adjusting Springs
appears to be equal, but excessive throughout its entire
a. Removal and Installation.
length.
(1) Remove cotterpin and nut (fig. 3-113)
c. Adjustment.
After installation, refer to
from end of rod bolt. Remove cotterpin from nut at end
of spring, and move nut toward adjusting block until
tension on springs is relieved.
3-117
