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 26 of 481
TM 9-2320-272-10
1-9
1-11. EQUIPMENT CHARACTERISTICS, CAPABILITIES,
AND FEATURES
a.
The 5-ton, 6x6, M939, M939A1, and M939A2 series vehicles are designed for
use on all types of roads, highways, and cross-country terrain. These vehicles also
operate in extreme temperatures such as arctic weather conditions.
b.
The M939 series vehicles are an improved version of the M809 series. The
improvements make M939 series vehicles more reliable and easier to operate. The
major improvements are:
WARNING
This vehicle has been designed to operate safely and efficiently
within the limits specified in this TM. Operation beyond these
limits is prohibited IAW AR 70-1 without written approval from
the Commander, U.S. Army Tank-automotive and Armaments
Command, ATTN: AMCPEO-CM-S, Warren, MI 48397-5000.
(1)
Automatic Transmission
(2)
Improved Power Steering System
(3)
Complete Airbrake System
(4)
Improved Cooling System
(5)
Improved Electrical System
(6)
Three-Crew Member Cab
(7)
Tilt Hood
(8)
Hydraulically Powered Front Winch
c.
The M939 series vehicles use 11:00 x R20 tires and have rear tandem duals,
while the M939A1 and M939A2 series vehicles use 14:00 x R20 super sized tires
and rear tandem singles. The mounted tires and spare on each vehicle are non-
directional in design and use.
d.
The M939 and M939A1 series vehicles employ the Cummings (NHC 250) 250
horsepowered engine, while the M939A2 series vehicles use a smaller, turbocharged
Cummings (6CTA8.3) 240 horsepowered engine. The M939A2 series vehicles
additionally have the Central Tires Inflation System (CTIS) which allows for
greater tactical mobility.
e.
All M939/A1/A2 series vehicles utilize the same automatic transmission, are
equipped with a spare tire mount at the rear of the cab, have removable canvas cab
tops, and are supplied with pintle hooks and air connections used for towing.
f.
The 5-ton load limit rating of M939/A1/A2 series vehicles does not mean
these vehicles are limited to 5-ton payloads. A vehicle rating only indicates the
maximum amount of cargo weight the vehicle axles and frame can withstand when
operating under the worst cross-country conditions.
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