PS Magazine - TB 43-PS-583
PS, The Preventative Maintenance Monthly
ISSUE 583
JUNE 2001
Dear Sergeant L.G.,
No, there is no length standard for either spring. For the driving rod spring (also
called helical compression spring), use the criteria in Item 6 in the TM’s PMCS on
Page 2-4.1: “Check spring for
broken strands. Spring should
not have more than one broken
strand on the same coil, or
more than two broken strands,
regardless of location, on
entire spring.”
For the firing pin spring, see the criteria in Item 7 of the PMCS: “Check firing
pin spring for kinks, breaks and retention capability (tight enough to stay on pin).”
M58 Smoke Generator…
V
ibration can bounce open an unlocked hatch on the M58 smoke generator IR
hopper. Then, when you’re driving down the road, graphite starts blowing out of
the hopper.
The solution is simple. During your
before-operation PMCS, make sure the
hopper hatch’s locking pin in the crew com-
partment is in the upper hole. The pin often
is left in the lower hole after the hopper is
filled, but that lets the hatch come open.
As long as the locking pin is in the upper
hole, the hatch can’t open.
PS 583
JUN 01
50
M249 Machine Gun…
m249 Spring Length OK?
As long
as the springs
meet these
standards,
continue to
use them.
Check driving rod spring
for broken strands
Check firing pin spring for
kinks, breaks, and tightness
Reprinted from PS 359 (1982)…
This spring
is
too long,
but what’s
the right
length?
I’ll e-mail
half-mast.
If anybody
knows,
he does!
Make sure locking
pin is in upper hole
Erase Graphite Loss
583. 50-51 (C)
4/28/01
8:03 PM
Page 1
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