TM-9-2320-272-24-1
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL; VOLUME 1 OF 4
JUNE 1998
TM-9-2320-272-24-1 - Page 124 of 1015
TM 9-2320-272-24-1
Table 2-1. Unit Preventive Maintenance Checks and Services (Contd).
PROCEDURE
NOT FULLY
MISSION
CAPABLE IF:
36
Semi-
Rear
NOTE
annual
wheels
and hubs,
• Similar left and right side, and forward-rear and
and
rear-rear components are inspected in the same
suspension
manner and will be accomplished simultaneously,
(Contd)
although procedures are written for left side only.
• When documenting discrepancies for similar left
and right side, and forward-rear and rear-rear
components, indicate which area is affected.
• 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, break tire down, and inspect for damage to rim or
tire. Replace any damaged wheel components (para. 3-221).
b.
On M939A1/A2 series vehicles, inspect wheels for any
loose or missing rim nut. Tighten rim nuts 210-240 lb-ft
(285-325 N•m). Replace any rim stud that is broken or has
stripped threads (para. 3-222).
[RPL]
c.
Clean, inspect, and lubricate inner and outer rear
wheel bearings (3-225).
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
(para. 3-174).
e.
Check brakeshoe-to-drum clearance and condition of
brakeshoes (para. 3-179). If clearance is more than 0.06 in.
(1.5 mm), manually adjust brakes or notify your supervisor
of inoperative adjusters. Replace brakeshoes if worn
beyond chamfer on linings (para. 3-180).
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 (para. 3-181).
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 (para. 3-182).
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 (para. 3-188).
Tighten loose air lines and fittings.
2-36
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