PS Magazine - TB 43-PS-588
PS, The Preventative Maintenance Monthly
ISSUE 588
NOVEMBER 2001
PS 588
NOV 01
22
M917A1 Dump Truck…
A
fter draining the air tanks on your M917A1 dump truck’s air brake system,
you’re ready to call it a day.
But wait a sec.
What about the air tank for the truck’s tailgate and material control system
(MCS)? It’s seldom drained because it’s in the back of the vehicle under the tail-
gate’s cover. But when the temperature drops, condensation gets into the airlines
and solenoid-controlled air cylinders.
During operation, that condensation causes the tailgate to become sluggish or lock
up. Dumping operations come to a halt because the tailgate won’t open or close.
So before you call it a day, pull the air tank pull cable to let any water out. Release
the pull cable when all the water and air have drained out. This procedure is Step 16
of the operator’s PMCS in TM 5-3805-264-14&P.
621B Scraper…
D
on’t forget your scraper’s batteries during your weekly PMCS, operators.
During operation, the battery box collects sand and dirt that turns to mud in wet
weather. Mud holds moisture that can close the circuit between the positive and neg-
ative terminals. That causes batteries to discharge.
With the battery box open, remove any dirt and sand you find. Then make sure
the foam pads on the box’s access doors are in place. The pads keep the battery
clamps, battery posts and the box’s support rails from touching the access door.
Without the pads in place, the batteries can short out.
If a pad is torn or missing, your
mechanic can replace it. NSN 9320-00-
060-9363 brings a 24 x 24-in rubber
sheet. Keep the pads in place with
cyanoacrylic adhesive, NSN 8040-00-
142-9193. This NSN will bring you ten
1-oz bottles.
Any time batteries are removed, eye-
ball the condition of the battery box.
Remove any moisture you find in the
bottom of the box. It could cause the box
to rust and deteriorate.
Your mechanic can use a wire brush to scrape off rust and old paint. After clean-
ing, protect the bare metal inside the box with bituminous coating compound, NSN
c’mon
charlie,
let’s call
it a day!
One
pull…
…lets all the
water out
Battery box
pads in place?
clean out
dirt and sand
before
it gets
packed in!
Charlie
doesn't realize…
his job's
not
done… he's still
got… [sob]
ONE
PULL
TO GO!
588. 22-23 (C)
10/2/01
1:56 PM
Page 1
Back to TopBack to Top
