PS Magazine - TB 43-PS-559
PS, The Preventative Maintenance Monthly
ISSUE 559
JUNE 1999
PS 559
12
JUN 99
Length of torque wrench
M2/M3-Series Bradley, MLRS . . .
Corrected
reading
Required
torque value
Torque wrench length + Adapter length
Torque wrench length
=
–
:
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 cen-
ter of the wrench.
After you’ve torqued the screws
properly, paint or scribe a mark on and
beside the head of each screw. That
makes it easier for crewmembers to
see if the screws have moved
when they do their
weekly PMCS.
Length of adapter
Marked screws are easier to check
mechanics,
a
loose prop shaft
in your bradley or mlrs
is a
dangerous
proposition
.
look out
below!
i've
lost
a
prop shaft
!
The conversion formulas are the same for both the Bradley and the MLRS:
JUN 99
f the shaft pops loose, it flails around, tearing up the transmission, brake
linkage, and even the driver if it breaks through the firewall.
That’s why you should always check for loose prop shaft screws during
semiannual services. Never reuse a loose screw. It won’t stay tight. Replace the
screw and torque it to 86–94 lb-ft. Tighten once, loosen and then tighten again.
Make sure the torque wrench doesn’t touch the bearing cap or other parts
while torquing, too. If it does, you’ll get an incorrect reading and the screws may
not stay in place.
Make sure you torque it correctly, too. Some of the screws 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 for in the -20-1-3 TMs. If you use the adapter,
remember that it adds to the length of the torque wrench. That means the actual
torque applied will be less than what the torque wrench dial or scale shows.
To use the adapter correctly, you must convert the torque value before you
start. The conversion keeps you from under- or over-torquing the screws.
PS 559
12
JUN 99
Back to Top Back to Top
