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 362 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:
b.
Inspect fan actuator and sensor for security of
mounting. Inspect air hoses and fittings for loose
connections, cracks, frays, wear, and damage that could
cause leaks. Tighten loose connections. Replace any air
line, hose, or fitting that is cracked, frayed, worn, or
damaged and could cause leaks.
c.
Inspect radiator core for clogged or bent fins,
leaks, and protruding debris. Clean clogged core and
remove debris (Volume 5, WP
0819).
d.
Inspect water pump vent/drain for obstructions.
e.
Inspect water pump pulley and fan for play.
f.
On M939A2 series vehicles, inspect power
steering cooler core for clogged or bent fins, leaks, and
protruding debris. Clean clogged core and remove
debris.
g.
Check drivebelt(s) for proper tension.
(1)
For M939A2 series vehicles, check belt
tensioner for security of mounting 30 lb-ft (41 N·m) and
condition of fan drivebelt (WP
0296).
(2)
For M939/A1 series vehicles, check fan
drivebelt tension and adjust as required (WP
0297).
(3)
For M939/A1 series vehicles, check power
steering pump drivebelt tension (Volume 3, WP
0504).
(4)
For M939/A1 series vehicles, check water pump
drivebelt tension and adjust as required (WP
0294).
(5)
For M939/A1 series vehicles, check alternator
drivebelt tension (WP
0302).
h.
Inspect fan blade for security, breaks, missing
or loose screws and rivets, and damage which could
cause an out-of-balance condition. For M939/A1 series
vehicles, refer to (WP
0298) and for M939A2 series
vehicles, refer to (WP
0283). Replace fan blade as
required.
i.
Inspect surge tank, water manifold, thermostat
housing, radiator, engine oil, transmission oil cooler,
transmission oil cooler, and hoses for leaks, conditions
and security of mounting(s).
j.
Inspect temperature sending unit for security of
mounting. Inspect sending unit wiring for frays, splits,
breaks, and worn or missing insulation.
k.
Check antifreeze protection temperature and
adjust if necessary to refer to (WP
0287).
TM 9-2320-272-23-2
0207
0207-27
Back to Top
