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 338 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:
4
Semiannual
Brakes
NOTE
•
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%
tolerance (variation) in specified
lubrication point mileage is
permissible.
a.
Check brake pedal for free travel. Adjust brake
pedal if required (Volume 3, WP
0433).
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.
Any wheel does not
immediately release.
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
Semiannual
Engine
NOTE
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.
Any engine instrument not
properly reading.
b.
Check engine instruments. Refer to
TM
9-2320-272-10 for proper readings.
6
Semiannual
Transmission
a.
Check transmission oil temperature gauge.
Normal range is 120°F to 220°F (49°C to 104°C)
Oil temperature exceeds
300°F (149°C).
b.
Check for response to shifting and smoothness
of operation is all speed ranges. Refer to
TM
9-2320-272-10 for proper shifting speed ranges.
Transmission does not
shift at correct speeds.
TM 9-2320-272-23-2
0207
0207-3
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