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 92 of 1015
TM 9-2320-272-24-1
2-12. SPECIFIC PMCS PROCEDURES (Contd)
(2) Interval.
Indicates when check or service is to be performed (para. 2-9).
(3) Item To Check/Service.
(a)
Lists the system, common name, or location of the item to be inspected.
(b)
The letters RPL in this column indicate replacement parts are required to complete the task
or procedure. Check mandatory replacement parts list immediately following table 2-1.
(4) Procedure.
Provides instructions for servicing, inspection, replacement, or adjustment and, in
some cases, having an item repaired at a higher level. If a defect is found, repair, fill, replace, or adjust as
needed.
(5) Not Fully Mission Capable If:.
Provides information for deadlining a vehicle when checks or
services reveal a defect or deficiency of a component(s) of the vehicle.
Table 2-1. Unit Preventive Maintenance Checks and Services.
ITEM TO
ITEM
INTERVAL
CHECK/
NO.
SERVICE
PROCEDURE
NOT FULLY
MISSION
CAPABLE IF:
SEMIANNUAL INSPECTION
PRIOR TO ROAD TEST
2.
Observe for hesitation or varying idle speed.
binding.
3.
Check for sticking or binding of pedal. If
accelerator pedal binds or sticks, troubleshoot (para. 2-21).
b. Be alert for excessive vibration, fuel odor, oil, coolant
b.
Engine knocks,
or exhaust dripping, and any indication of malfunction.
rattles, or smokes
excessively.
3
Semi-
Throttle
Check throttle control travel and freedom of movement.
Throttle control is
annual
Pull throttle control all the way out, rotate, and release.
sticking or binding.
Throttle control should return to original position. If
control sticks or binds, lubricate (LO 9-2320-272-12) or
replace (para. 3-45).
Perform all Before operation and Weekly checks
listed in TM 9-2320-272-10 PMCS in addition to
those that follow.
1
Semi-
Starter
Start engine (TM 9-2320-272-10). While starting engine,
Starter is inopera-
annual
listen for unusual noises and difficult cranking.
tive or makes
excessive grinding
noise.
2
Semi-
Accelerator
a.
Observe response to accelerator pedal.
a.
Accelerator
annual
pedal and
1.
Listen for unusual noises.
pedal is sticking or
engine
2-4
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