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 93 of 1015
TM 9-2320-272-24-1
Table 2-1. Unit Preventive Maintenance Checks and Services (Contd).
ITEM
ITEM TO
NO.
INTERVAL
CHECK/
SERVICE
PROCEDURE
NOT FULLY
MISSION
CAPABLE IF:
3
Semi-
Throttle
ROAD TEST
annual (Contd)
Perform all During operation checks listed in
TM 9-2320-272-10 PMCS in addition to those that
follow. Drive vehicle at least 5 mi. (8 km) over varied
terrain, both on and off road. This will provide
ample time to check reported malfunctions and to
locate unreported malfunctions.
Lubrication intervals of every 1,000 mi. (1,600 km)
or monthly, and 3,000 mi. (4,800 km) or 3 months,
will be performed with maintenance or, when
practical, lubrication services will be made to
coincide with the semiannual preventive
maintenance services. For this purpose, a 10 percent
tolerance (variation) in specified lubrication point
mileage is permissible.
4
Semi-
Brakes
a.
Check brake pedal for free travel. Adjust brake pedal
annual
if required (para. 3-196).
b.
Reach a desired speed and lightly apply brake pedal
with steady force. Vehicle should slow down immediately
and stop smoothly, without side pull or chatter.
c.
After stopping vehicle, and with transmission select
lever in 1-5 (drive), release brake pedal. All wheel brakes
should release immediately and without difficulty.
5
Semi-
Engine
NOTE
annual
Ensure engine tachometer does not exceed
maximum governed speed of 2,400 rpm with no
load.
a.
Check engine throughout the range of operating
speeds. Refer to TM 9-2320-272-10.
b.
Check engine instruments. Refer to TM 9-2320-272-10
for proper readings.
6
Semi-
Transmis-
a.
Check transmission oil temperature gauge. Normal
a.
Oil temper-
annual
sion
range is 120
o
-220°F (49
o
-104°C).
ature exceeds
300°F (149°C).
b.
Check for response to shifting and smoothness of
operation in all speed ranges. Refer to TM 9-2320-272-10
for proper shifting speed ranges.
7
Semi-
Transfer
Shift transfer case lever between HI and LOW positions to
annual case
ensure proper operation. Observe for smoothness of
engagements. Refer to TM 9-2320-272-10 for proper
shifting speed ranges and operation.
8
Semi-
Suspen-
Observe how vehicle responds to road shock. Constant
annual
sion
bouncing or swaying from side-to-side is an indication of a
malfunction.
2-5
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