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 363 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:
25
Semiannual
Compressor
a.
Check compressor for security of mounting and
leaks.
(1)
If M939/A1 series engine-mounted compressor
is loose, notify your supervisor.
(2)
If M939A2 series engine-mounted compressor
is loose, replace locknut and tighten to 55 lb-ft (77 N·m).
b.
Check condition and security of cooling lines to
air compressor. Tighten cooling lines, if loose. Replace
cooling lines if split, cracked, or damaged in such a
manner as to cause leaks (WP
0284).
c.
On M939A2 series engines, check condition of
compressor oil line and fittings. Tighten fittings and oil
line if loose. Replace oil line if split, cracked, worn, or
damaged in such a manner as to cause leaks (Volume
3, WP
0470).
d.
Check condition and security of input tube and
hoses, output air line, and governor control air line.
Tighten output and governor control air lines, if loose.
Replace input tube or hoses if split, cracked, collapsed,
distorted, or damaged in such a manner as to prevent a
tight seal or restrict incoming air (WP
0284).
26
Semiannual
Engine
Lubrication
System and Oil
Lines
a.
Inspect all engine oil lines, hoses, and fittings
for loose connections, cracks, frays, wear, and damage
that could cause leaks. Tighten loose connections, and
replace any oil lines, hoses, and fittings, that are
cracked, frayed, worn, or damaged and could cause
leaks.
NOTE
•
Oil filter is located on lower front left
side of engine on M939/A1 series
vehicles and lower front right side of
engine on M939A2 series vehicles.
•
M939/A1 series vehicles utilize an
element-type engine oil filter, while
M939A2 series vehicles use one of
two styles of cartridge-type engine oil
filters.
b.
Inspect M939/A1 series vehicles for security of
oil filter housing. Ensure filter center bolt is tight. If center
bolt is loose, tighten 25 to 35 lb-ft (34 to 48 N·m).
c.
Inspect M939A2 series vehicles for security of
oil filter head. Ensure spin-on oil filter is tight. If spin-on
oil filter is loose, hand-tighten, then tighten an additional
3/4 turn with a wrench.
TM 9-2320-272-23-2
0207
0207-28
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