PS Magazine - TB 43-PS-554
PS, The Preventative Maintenance Monthly
ISSUE 554
JANUARY 1999
PS 554
13
JAN 99
PS 554
12
JAN 99
Check vents for clogging
rewmen, tank track maintenance is
a lot easier with an electric impact
wrench, NSN 5130-01-363-0964, that±s
in tip-top shape²
Proper use and good PM will ensure
the wrench is ready the next time
you need it² Here are a few things to
remember:
Operation
¤
The impact wrench is a powerful tool
that generates a lot of heat, even during
normal operations² The manufacturer rec-
ommends a duty cycle of three to five
seconds on and five to 10 seconds off²
M1-Series T
anks ± ± ±
¤
Always wear safety glasses and use
the blue retainer rings when operating
the impact wrench²
Repair
Call in your mechanic to repair
an impact wrench that±s damaged or
not functioning properly² He±ll follow
the procedures in Appendix F of the
-20-1-5 TMs²
The most common problems are
worn brushes and a bad switch² The
brushes can be fixed with the brush
repair kit, NSN 5977-01-384-4862²
After installing a new brush kit, free
run the wrench for
15 minutes
in both
directions² That seats the brushes and
improves the electrical contact²
Replace a bad switch with NSN
5930-01-386-0531² Other repair parts
are listed in Group 3100 of the -24P-1
TMs²
Free run the wrench
for about 30 seconds af-
ter hard use² That will
help get rid of excess
heat²
¤
Always use the side
handle to avoid cover-
ing the air vents with a
hand or glove²
¤
Keep the wrench
square with the fastener
being removed or in-
stalled²
¤
Never let the wrench
hang free from a fas-
tener or use a pry bar to
get it loose²
¤
If the wrench won±t
break the hardware
loose within five sec-
onds,
stop
! The wrench
will burn up if you force
it to loosen nuts and
bolts that are too tight² Use an exten-
sion handle, socket, and socket wrench
from the tank±s basic issue items (BII)
to break the hardware loose, then use
the impact wrench to finish the job²
¤
When installing hardware, always
thread it with your fingers first,
then tighten with the impact wrench²
Using the wrench to start nuts and bolts
could cross-thread them and jam the
hardware²
If the TM requires a specific torque
for the hardware, use a torque wrench
to finish tightening, not the impact
wrench²
Give wrench a rest after
every 3±5 seconds of use
¤
Check the vents on the wrench±s
dust cover before operation² Clean
away dust or other obstructions²
Clogged vents will overheat the motor
and burn it out, so keep the wrench
out of dirt, sand and mud as much as
possible²
that
new brush
kit has you
ready to
go!
yep!
i’m ready
to make an
impact!
PS 554
13
JAN 99
PS 554
12
JAN 99
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