PS Magazine - TB 43-PS-563

PS, The Preventative Maintenance Monthly

ISSUE 563

OCTOBER 1999
PS Magazine - TB 43-PS-563 - Page 4 of 34
PS 563
5
OCT 99
echanics, leave well enough alone when it comes to the rubber boots on a
vehicle’s brake master cylinder or wheel cylinder.
When you check the vehicle’s brake system, look for leaks from the seals on
those cylinders, but
never
pull the boots back to find a leaky seal. If the seal is
bad, brake fluid will be dripping from the boot.
Trucks and Trailers . . .
Pulling back the boot can
cause
a leak. And, grit gets in if you don’t re-seat the
boot just right.
The best way to find a leak is to check the fluid level in the reservoir. If it’s
low, fill it. Check the level daily for at least a week. If it drops during that period,
you’ve got a leak. So, go over the system until you find it and get it fixed.
Under the Floor
Wrench, NSN 5120-00-203-4766, is
needed to tighten lug nuts. It has open-
ings of
13
/
16
, 1
3
/
16
, 1
1
/
4
and 1
1
/
2
inches.
Hub grease seals can be a problem,
since you can get three different seals
To get the right one, order on a DD
Form 1348-6 using the NSN, part num-
ber B370036BGO and CAGE 01212
from RIC S9I. Write “2B” in card col-
umns 65 and 66 so no substitution will
be made.
Check slack adjusters before you
move out. Make sure the adjusters and
camshafts get lubed. There are six fit-
tings on each axle. Without lube, brake
freeze-up is a real possibility—and real
trouble on the road.
Not the Only One
Get right with the Usable On Code
(UOC) in the -14&P so you get the
right parts for
your
trailer. M872-
series semitrailers were built by more
than one manufacturer, so the UOCs
not only identify models, but makers,
too.
Find the manufacturer on the trailer
data plate.
Don’t be put off if a repair part you
get from supply looks different from
the original. More than one manufac-
turer is involved, so if it fits and works,
use it. If it doesn’t fit, turn it in so your
supply can return it.
Spare’s pressure OK? Cracked
or broken carrier welds?
no joking matter to find the spare flat.
Also check the spare carrier for bro-
ken or missing welds. You don’t need
to drop a tire while you’re moving.
Slack adjuster lubed?
Check the spare tire for air so you
don’t end up all flat in the boonies. It’s
someone
left
the
rubber
boot open
!
check
it out
,
grimy!
excellent!
let’s begin our
dirty work
!
good
trailer pm
will keep
your cargo
moving!
Look for drips here .
..
...and here
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