PS Magazine - TB 43-PS-585

PS, The Preventative Maintenance Monthly

ISSUE 585

AUGUST 2001
PS Magazine - TB 43-PS-585 - Page 7 of 32
PS 585
AUG 01
11
M373A2 Semitrailer.
..
ulling an M373A2 electronics semitrailer behind an M931-series tractor or an
M1088 FMTV tractor is no problem at all. But hooking up to one, or unhooking
from one, can be a big problem.
Both the M931 and the M1088 tractors are tall at the fifth wheel—tall enough that
the landing legs of the M373A2 don't touch the ground even when they're fully
extended.
Unless you block underneath the legs, that trailer is going to drop when you pull
out from under it. The drop can damage the legs, or maybe even cause them to col-
lapse. Even if neither of those things happen, you're still going to have it tough try-
ing to hook up to the trailer next time.
Block the landing legs solidly so there's no problem pulling out from under the
trailer or backing under the trailer.
PS 585
AUG 01
10
M747 Semitrailers. . .
Matching Hub Info
M
echanics, hubs for early model M747 semitrailers (serial numbers 1-200) are no
longer available.
If a hub goes bad, you have to order two complete new hub and wheel assemblies—
one for each side of the axle.
You can't run the old wheel and hub assembly on the same axle with the new one.
They are not the same size. But you can run both types on the same trailer.
The new hub is the B type used on M747s serial numbered 201 and higher.
M1000 Semitrailer Tire
T
he only tested, approved and authorized tire for the M1000 semitrailer is
Michelin LT215/75R17.50 P-metric radial, NSN 2610-01-323-4813, load range H.
This tire rated best for off-road
and
highway use in TACOM tests.
Tanker Axle Seal Changes
2
2
20
20
4
Hub
Brake drum
Wheel stud
Lug nut
Wheel Assembly
you mean because a
hub
on the
other
side
of this axle is bad,
I’ve got to go,
too?
Gotta block
those
short
legs
before
dropping
this trailer.
Yep.
N
ote these axle seal changes for M900-series tanker trailers in Fig 32 of TM 9-
2330-356-24P. Item 8, axle seal, can be ordered three different ways.
NSN 5330-01-101-4854—seal without wear ring (part number K24HH100)
NSN 5330-00-933-4198—seal with wear ring (PN 320-2173 for seal and PN
315-1503 for wear ring)
NSN 5330-01-417-5137—seal kit (PN 372-7091) that contains the seal along
with many others used on these tankers.
ITEM
QTY
per axle
NSN
other parts-
bearings,
seals and
brake parts-
are the same
for both
wheel drums.
585. 10-11 (C)
6/28/01
1:48 PM
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