PS Magazine - TB 43-PS-580

PS, The Preventative Maintenance Monthly

ISSUE 580

MARCH 2001
PS Magazine - TB 43-PS-580 - Page 7 of 32
PS 580
MAR 01
11
PS 580
MAR 01
10
M872-Series Semitrailers.
..
nly one of the M872 family of semitrailers can use radial tires and tubes—
the M872A2. It’s the only one that’s been tested and approved for radials.
The M872, M872A1 and M872A3 trailers use only
bias
tire, NSN 2610-00-
060-9960, and
bias
tube, NSN 2610-00 -051-9450. The tire is 10.00-20, load
range G.
In addition to that bias tire and tube, the M872A2 can also use
radial
tire,
radial
tube, NSN 2610-00-029-0563. The tire
is
echanics, sand, dirt and moisture col-
lect on top of the PLS’ transmission.
Unfortunately, that’s also where the
transmission breather, NSN 2520-00-
914-4680, is located.
When the breather clogs, the trans-
mission can’t vent. Instead, it overheats
Clogged
breather
blows
transmission
seals
M1074/M1075 PLS . . .
and the pressure blows the transmission
seals. That deadlines the vehicle.
Make sure you remove, clean, and
inspect the breather annually or every
6,000 miles, whichever comes first.
Here’s how:
1.
Unscrew the breather from the
reducer, then remove the reducer.
2.
Clean the breather and reducer with
dry cleaning solvent. Let the parts air-
dry thoroughly.
3.
Eyeball the breather and reducer
for cracks, dents and stripped threads.
Replace the parts if damaged. A new
reducer comes with NSN 4730-01-188-
3183.
11.00R-20, load range H.
Although this tire is not shown in the parts TM, it has been available for the
A2 model since 1995.
All models of M872 semitrailer use tire flap, NSN 2640-00-158-5617.
Never mix bias and radial tires on the same trailer axle. Doing that will cause
tire and component damage. It’s OK to mix radial and bias tires on different
axles of the same trailer.
4.
Apply sealing compound, NSN
8030-01-054-0740 or 8030-01-166-
0675, to the reducer’s threads and screw
it back into the transmission.
5.
Put some sealing compound on the
threads of the breather and reinstall it in
the reducer.
580. 10-11 (C)
1/29/01
10:21 PM
Page 1
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