PS Magazine - TB 43-PS-618

PS, The Preventative Maintenance Monthly

ISSUE 618

MAY 2004
PS Magazine - TB 43-PS-618 - Page 6 of 33
PS 618
MAY 04
9
M
istakes you make when installing the gunner’s primary sight GPS body will
come back to haunt you as leaks, mechanics.
Two mistakes you can avoid are sloppy cleanup before installing the GPS body
and using the wrong sealant.
You must clean the turret access lip
completely before you install the GPS
body. That means using putty knives,
dry cleaning solvent and lots of rags.
Any residue you leave behind will keep
the new compound from sealing proper-
ly. That means leaks.
Once the GPS body’s in place, fill the
area between the lip of the body and the
turret roof with sealing compound, NSN
8030-00-753-5005. This sealing com-
pound comes in a special 6-oz cartridge
that must be applied with sealant gun,
The sealant gun will be added to
Appendix E, Tools List, in a future
update of the 20-2-4 TMs.
Do not use any other sealer for this job. Silicone sealer, adhesive, gasket cement
or gasket sealer
will not
work. Take no shortcuts and there’ll be no leaks.
PS 618
M113-series FOV:
1.
With the transmission controller in SL (steering lock), let the vehicle roll to a
complete stop on firm, level ground. Stop the engine.
2.
Insert the drive pin punch, NSN 5120-01-006-8847, from your vehicle’s BII
between the top of the No. 2 roadwheel and the bottom of the track. If the punch can
be inserted freely, and the track touches the top of the No. 3 roadwheel, track ten-
sion is correct.
If the punch can be inserted freely, but the track does not touch the top of the No.
3 roadwheel, track tension is too tight. Go to step 3.
If the punch cannot be inserted freely, the track is too loose. Go to step 4.
3.
To loosen track tension, slowly open the bleed valve on the track adjuster to let
grease out. Retighten the bleed valve, wipe away excess grease and go back to step
1. If the track adjuster is in as far as it will go and the track is still too tight, add a
track shoe and readjust the tension.
4.
To tighten track tension, pump in grease through the fitting on the track adjuster.
Do not extend the track adjuster more than 17 inches (measured between the cen-
ter of the track adjuster mounting screws) or it may buckle during operation. If the
track is still too loose, remove a track shoe and readjust the tension.
Track tension can also be checked using the track and sprocket gauge.
Instructions start on Page 3-21 of TM 9-2350-261-10 and Page 0091 00-1 of TM 9-
2350-277-10.
Driving
Be wary of a lack of steering response. That indicates sand is building up between
the treads and sprockets or idler wheels. If you allow the buildup to continue, the
sand will throw the track.
Try “shaking” the vehicle with the steering or
backing up to remove sand buildup. Remove
accumulated sand by hand at your next stop.
Make wide, smooth turns instead of sharp,
hard turns. That’ll eliminate some of the sand
accumulation and put less stress on track pads.
Put sealing compound between
lip of body and turret roof
Use sealant gun to prevent leaks
what
are
you going
to do with
that!?
do you think
gps
stands
for
g
eneral
p
urpose
s
ealant!?
these
pm tips
will keep
you
on
track
in
the
desert.
With punch between bottom of
track and top of No. 2 roadwheel…
…track should touch top of No. 3 roadwheel
M1-Series Tanks…
Give
GPS
a Tight Seal
618. 08-09 (C)
3/27/04
11:52 AM
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