TM-9-2320-272-23-2
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; FIELD MAINTENANCE MANUAL; VOLUME 2 OF 5
SEPTEMBER 2012
TM-9-2320-272-23-2 - Page 372 of 1417
Table
1.
Field Preventive Maintenance Checks and Services - Continued.
ITEM
NO.
INTERVAL
ITEM TO BE
CHECKED OR
SERVICED
PROCEDURE
EQUIPMENT
NOT READY/
AVAILABLE IF:
•
Lugnuts on left side have left-hand
threads and can be identified by an
L, while lugnuts on right side have
right-hand threads, and can be
identified by an R.
a.
On M939 series vehicles, inspect split locking
ring for dents or breaks that could cause them to pop off.
If ring is loose, inspect for damage to rim or tire. Replace
any damaged wheel (Volume 3, WP
0485).
b.
On M939A1/A2 series vehicles, inspect wheels
for any loose or missing rim nut. Tighten rim nuts
210
to
240
lb-ft
(285 to 325 N·m). Replace any rim stud
that is broken or has stripped threads. has stripped
threads (Volume 3, WP
0485).
c.
Clean, inspect, and lubricate inner and outer rear
wheel bearings.
d.
Inspect service and service/spring brake air lines
and fittings for loose connections, cracks, splits, or
damage that could cause air leaks. Tighten loose air
lines and fittings and replace any air line or fitting that
has cracks, splits, or damage that could cause air leaks.
e.
Check brake shoe-to-drum clearance and
condition of brake shoes (Volume 3, WP
0432). If
clearance is more than 0.06 in. (1.5 mm), manually
adjust brakes or notify your supervisor of inoperative
adjusters. Replace brake shoes if worn beyond chamfer
on linings (Volume 3, WP
0426).
f.
Inspect service brake chambers for condition and
security of mounting. Replace service brake chambers
and/or component parts if condition could impair
operation of brakes (Volume 3, WP
0434).
g.
Inspect service/spring brake chambers for
condition and security of mounting. Replace service/
spring brake chambers and/or component parts if
condition could impair operation of brakes (Volume 3,
WP
0435).
h.
Inspect rear relay valve for condition and security
of mounting and air lines and fittings for loose
connections. Replace rear relay valve and/or component
parts if condition could impair operation of brakes.
Tighten loose air lines and fittings.
i.
Inspect air manifold tee for condition and security
of mounting and air lines and fittings for loose
connections. Replace air manifold tee and/or component
TM 9-2320-272-23-2
0207
0207-37
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