TM-9-2320-272-10
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; OPERATOR'S MANUAL
SEPTEMBER 2004
CHANGE 2
TM-9-2320-272-10 - Page 372 of 481
TM 9-2320-272-10
3-23
Section III. MAINTENANCE PROCEDURES
3-6. GENERAL
The operator/crew is responsible for daily, weekly, and monthly checks listed in
the Preventive Maintenance Checks and Services, table 2-3. Certain other mainte-
nance services, also the responsibility of the operator/crew, are listed in this section.
a. General.
To perform engine service, the hood must be unlatched and
secured in the opened position. After completing engine service, release hood, lower
it to fixed position, and latch it (para. 2-19).
3-7. BREAK-IN OPERATION
a. Road Test.
CAUTION
Do not go faster than the maximum allowable speeds shown on
the maximum road speed data plate. Do not drive continuously at
maximum allowable speeds. Be alert for signs of equipment
failure. Failure to do this may result in equipment damage.
All vehicles received by the using organization must be road-tested to check
operation and condition of all reconditioned vehicles, except those previously driven
50 mi (80 km). The operator will check the instrument panel and gauges as often as
possible for signs of unsatisfactory performance. Stops will be made at least every
10 mi (16 km) to give the operator a chance to check the vehicle for possible coolant,
oil, fuel, or exhaust leakage and any signs that may show the engine, transmission,
wheel hubs, brake drums, axles, differentials, or transfer case assemblies are
overheated. The vehicle must be checked thoroughly for any control that is hard to
operate and any instrument not operating properly. Unusual noises and vibration
will be noted. All unusual conditions will be reported to unit level maintenance.
b. After Road Test.
After the road test, correct any faulty condition that can
be done at operator’s maintenance level. Notify unit maintenance about any other
faulty condition.
3-8. ENGINE SERVICE
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