PS Magazine - TB 43-PS-694
PS, The Preventative Maintenance Monthly
ISSUE 694
SEPTEMBER 2010
7
PS 694
SEP 10
1.
Load the bridge on your AVLB. If you
adjust track tension without it, the track
will be too loose when the bridge is in
place. That could result in a thrown track.
2.
Move the AVLB backward at least
two vehicle lengths. Then move forward
and let the vehicle coast (no brakes!) to a
complete stop on Frm, level ground.
3.
Clean off any dirt or mud from the
outboard end connectors between the Frst
and second support rollers.
I
f you’ve been using the 5-kW auxiliary power unit (APU) generator in your M577A2 command
post carrier, there’s more
involved than shutting down
the generator at the end of
the day.
You also need to shut off
the APU switch on the remote
control panel. If the switch
is left on, the panel keeps
drawing power. That drains
the vehicle’s batteries.
So remember to flip that
switch
off
to
keep
your
batteries fresh.
4.
Get a strong, 10-ft string and tie a weight, such as an extra centerguide or end
connector, to each end. Place one end of the string over the Frst end connector in
front of the No. 1 support roller. Extend the string past the No. 2 support roller and
over the next end connector. The weights should hang freely.
5.
±ind the center of the string and mark the nearest end connector with a piece of
chalk.
6.
Measure the distance between the string and the top of the marked end connector.
If the measurement is between 3/8 and 9/16 inch, track tension is good.
A measurement below 3/8 inch means the track is too tight. Above 9/16 inch
means the track is too loose.
Adjust the track following the instructions in TM 5-5420-202-10 (Aug 85 w/Ch
9, Dec 06). ±or AVLBs that have mechanical track adjusting links, the instructions
start on Page 3-53. ±ollow the instructions starting on Page 3-56 for vehicles with
grease-actuated links.
AVLB…
Checking Track Can Be Tense
M577A2
Command
Post Carrier…
Save the Batteries!
Measure between string and top of end
connector closest to center of string
Flip APU switch down at end of day
keep track
tension just
right by
checking it
after every
operation.
here’s
how…
an avlb with bad
track tension is
a maintenance
nightmare.
track
that’s
too
tight
cups
sprocket
teeth and
strains shoe
pins and end
connectors.
loose
track
gets thrown
and that
damages
roadwheels
and support
rollers.
guess I’d
better check
your track
tension!
not
without
my bridge,
you don’t!
694.06-07.indd
1-2
8/4/10
11:27:07 AM
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