PS Magazine - TB 43-PS-603

PS, The Preventative Maintenance Monthly

ISSUE 603

FEBRUARY 2003
PS Magazine - TB 43-PS-603 - Page 3 of 33
Run the wrench with no load for about 30 seconds
after hard use. That will help get rid of excess heat.
Always use the side handle to avoid covering the
air vents with a hand or glove.
Keep the wrench square with the fastener being
removed or installed.
Never let the wrench hang free from a fastener or
use a pry bar to get it loose.
PS 603
FEB 03
2
M1-Series Tanks…
Operation
The impact wrench is a powerful tool that gener-
ates a lot of heat, even during normal operations.
The manufacturer recommends a duty cycle of
three to five seconds on and five to 10 seconds off.
If the wrench won’t break the hardware loose within five seconds,
stop!
The
wrench will burn up if you force it to loosen nuts and bolts that are too tight. Use an
extension 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 job.
When installing hardware, always thread it with your fingers first, then tighten
with the impact wrench. Using the wrench to start nuts and bolts could cross-thread
them and jam the hardware.
If the TM requires a specific torque for the
hardware, use a torque wrench to finish tighten-
ing, not the impact wrench.
Check the vents on the wrench’s dust cover
before operation. Clean away dust or other
obstructions. Clogged vents will overheat the
motor and burn it out, so keep the wrench out of
dirt, sand and mud as much as possible.
Always wear safety glasses and use the blue
retainer rings when operating the impact wrench.
Repair
Call in your mechanic to repair an impact wrench that’s damaged or not func-
tioning properly. He’ll follow the procedures in Appendix F of the -20-1-5 TMs.
The most common problems are worn brushes or a bad switch. The brushes can
be fixed with the brush repair kit, NSN 5977-01-384-4862.
After installing a new brush kit, free run the wrench for 15 minutes in both direc-
tions. That seats the brushes and improves the electrical contact.
Replace a bad switch with NSN 5930-01-386-0531. Other repair parts are listed
in Group 3100 of the -24P-1 TMs.
Proper use and good
pm will ensure the
wrench is ready next
time you need it. Here
are a few things to
remember…
hey!
how ‘bout
a little pm!?
If you want
me to make an
impact,
you’d
better give
me
some pm first!
Give wrench a rest after
every 3-5 seconds of use
Check vents for clogging
my track’s
killing
me!
If your electric
impact wrench, nsn
in good shape, track
maintenance will
suffer, crewmen.
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