PS Magazine - TB 43-PS-684

PS, The Preventative Maintenance Monthly

ISSUE 684

NOVEMBER 2009
PS Magazine - TB 43-PS-684 - Page 10 of 33
16
PS 684
NOV 09
17
PS 684
NOV 09
15.12 in. m
ax.
When you replace the brake shoes on your FMTV, mechanics, pay attention to the
brake drums, too. Brake drums are consumable items and SMR-coded PAOZZ.
The
IETM
and
TMs
tell you how to measure
the brake drums as part of
the inspection in the brake
shoe
replacement
task.
Before turning the drums,
make
sure
the
inside
diameter
measures
less
than the maximum allowed
diameter of 15.12 inches.
This diameter is stamped
on the outside of each
drum. Discard the drum
if the inside diameter is
greater than 15.12 inches.
You also need to make sure the brake drums are free of scoring and cracks, and
that the drum mounting holes are not egg-shaped or cracked around the edges. And
be careful while turning the brake drums on your FMTV. Make sure the drums are
properly installed on the lathe, are not overheated during turning, and stay within the
maximum allowed inside diameter of 15.12 inches.
Machining brake drums can extend the life of the brake shoes, too, but the right
equipment has to be used. A support-level machine shop with a brake turning lathe,
NSN 4910-01-252-2959 or NSN 4910-00-516-6192, or a commercial company can
help you with this.
That’s right—keep ‘em as snug as possible. Loose chains damage tires and axle
components, and they get caught in debris. They will eventually fall off if left
unattended. No chains—no traction. It’s that simple!
Now, here are some things to keep in mind about the ASV’s tire chains.
Do not
use
the info in TM 9-2320-307-10 to install the diamond-shaped tire chains, NSN 2540-
01-432-2989, on the ASV. These instructions don’t keep the chains tight enough
around the tires. Instead, use the instructions that come with the chains.
The same goes for standard tire chains that come with NSN 2540-00-933-9033.
That is, follow the instructions that come with the chains.
By the way, it’s easier to
put these tire chain sets on if
you set the vehicle’s CTIS to
“emergency” before installation.
Remember to take your time,
work on hard, level ground, and
periodically check the chains to
make sure there’s no slack.
Turning
Brake Drum
Can Extend
Brake
Shoe’s Run
Tire Chain
Slack
FMTV±…
Turning
Brake Drum
Can Extend
Brake
Shoe’s Run
M²²²7³
ASV…
Tire Chain
Slack
drivers,
remove
any slack
from tire
chains when
you install
them on the
armored
security
vehicle
(asv).
diamond-shaped tire chains for ASV
DIsc´rd³
druµ³If³
µ´XIµuµ³
INsIde³
dI´µeter³
Is³gre´ter³
th´N³
²¶±²·”
Br´kINg³
surf´ce
MouNtINg³
surf´ce
MouNtINg³
holes
want to extend
the life of your
fmtv’s brake shoes
and maintain a true
braking surface?
turning or
machining
the brake
drums can
help!
684.16-17.indd
1-2
9/16/09
9:12:19 PM
Click here for a copy of this article to save or email.
Click here for a copy of this article to save or email.
Back to Top
Back to Top