PS Magazine - TB 43-PS-665

PS, The Preventative Maintenance Monthly

ISSUE 665

APRIL 2008
PS Magazine - TB 43-PS-665 - Page 5 of 33
6
PS 665
APR 08
CORRECTED
READING
REQUIRED
TORQUE
VALUE
TORQUE WRENCH LENGTH
+ ADAPTER LENGTH
TORQUE WRENCH LENGTH
So take control of the situation. Check for loose prop shaft bolts during semiannual
services. Never reuse loose bolts ‘cause they won’t stay tight. Replace them with
new bolts, NSN 5306-01-132-3369, and torque them to 85-95 lb-ft. Use the torque
wrench to tighten once, loosen and then tighten again.
Some of the bolts can’t be reached with the end of the torque wrench, so you’ll
need the 4-in torque wrench adapter, NSN 5120-01-315-5708, called out in the
Special Tools appendix in your -20-1-5 TMs.
The adapter keeps the torque wrench from touching the bearing cap and other
parts. If it touches, you’ll get an incorrect reading and the bolts may not stay in
place.
When using the adapter, remember that it adds to the length of the torque
wrench. So the actual applied torque will be more than what the torque wrench dial
or scale shows.
To use the adapter correctly, you must convert the torque value before you start.
It’ll keep you from under-torquing or over-torquing the bolts.
Remember, the length of the torque wrench is measured from the
center of the handle to the center of the drive. The length of
the adapter is measured from the center of the
drive to the center of
the wrench.
M2/M3-Series Bradleys, MLRS Carrier…
Keep Tight
Control
you may
also notice
that the
prop shaft
bolts no
longer
come with
pre-drilled
holes for
safety wire.
Torque wrench length
No safety wire needed on prop shaft bolts
Adapter length
mechanics, a loose
prop shaft in your
bradley or mlrs is a
dangerous proposition.
if the shaft pops loose, it
flails around, tearing up the
transmission, brake linkage,
and even the driver if it
breaks through the firewall.
…all that
damage…
just from
some loose
prop shaft
bolts!
yeah!
it’s
a miracle
the driver
wasn’t
hurt!
the bolts
are self-
locking and
no longer
require
safety wire.
The conversion
formula is the
same for both
the Bradley
and the MLRS:
it’s a
shame…
665.06-07.indd
1-2
3/4/08
4:24:20 PM
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