PS Magazine - TB 43-PS-557
PS, The Preventative Maintenance Monthly
ISSUE 557
APRIL 1999
PS 557
5
APR 99
PS 557
4
APR 99
Let the oil
cool before you
loosen the line,
so you won’t get
a hot oil bath.
When recon-
necting the line,
be sure not to
cross thread the
fitting. If you strip
the threads, the truck goes to support
to get the hose replaced.
Refill the tank and check the line for
leaks. If it’s leaking, tighten the fitting
1
/
6
turn or one flat at a time until the
leak stops.
he way to keep your M929- and
M930-series dump trucks on the job
is to load up on PM. Here are a few
loads to start with:
Keep the Bed Dry
Standing water in the dump bed
means the drain holes are clogged.
Ignore the standing water long
enough and you’ll have a rusted bed.
Eyeball the bed corner drain holes
for debris or paint. Clean the debris
away and run the tip of a ballpoint
pen or small screwdriver through the
holes to open ’em up.
If your dump is going to sit awhile
(like weeks or months), keep the bed
elevated so moisture can’t pool up.
M939-Series Trucks . . .
Check tie-down ropes before you
move out. Re-tie them if necessary.
Need a rope? Get one with NSN 4020-
00-968-1356.
If a rope comes undone, though, you
get canvas on the pipe—and that means
a repair bill for burned canvas.
Test with Bed Flat
Make sure the dump bed is com-
pletely lowered before you check the
fluid level in the hydraulic reservoir.
When the bed’s up, the fluid is in the
lift cylinder. You won’t get a true read-
ing of the amount in the reservoir. Add-
ing fluid with the bed up can blow
seals when the bed comes down.
There’s No Plug
Make sure you drain the hydraulic oil
reservoir annually. Since there’s no drain
plug, disconnect the oil line at the bot-
tom of the tank.
Keep It Tied
The tarp on the dump bed sits very
close to the exhaust pipe, even when
it’s tied down right and tight.
Use the dump body support braces
(bedlocks) to hold the bed up and keep
pressure off the main hydraulic cylinder.
Drain oil from
bottom line
Use support braces
✦
✦
Get the Hook
Lube
both
fittings
Remember to
grease both fit-
tings on the safety
latch hook. With-
out the lube, the
hook can “freeze”
in place. Then
it—or the latch
mount—will
break when you
raise the bed.
Fill here and check line for leaks
Tie tarp away from exhaust pipe
Untied tarp contacts pipe and burns
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