MAINTENANCE OF M939 SERIES VEHICLES - OD1661 - LESSON 1/TASK 1
Description and Data
These trucks are designated 5 ton, 6x6, M939 series vehicles. The "5
ton" refers to the vehicles' load limit rating. The "6x6" means that
each vehicle has six wheel ends and all six are capable of driving.
The "M939" is simply a code number given to this series of trucks to
distinguish it from others.
The 5 ton load limit rating of M939 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. Under good conditions such as an improved highway, these
trucks can safely carry payloads up to two times the rated payload.
M923 WO/W and M925 W/W (figure 1
on the following page).
(1) Differences. The only difference between the M923 cargo truck
and M925 cargo truck is that the M923 does not have a front winch and
the M925 does.
This difference affects the following:
length, vehicle weight, shipping dimensions, turning radius; approach
angle, and special winch-assisted operations.
The difference does
not affect the basic purpose or performance of the vehicles.
The M923 and M925 dropside cargo
trucks are used to transport payloads of up to 20,000 pounds on the
highway and 10,000 pounds cross-country. Fully loaded, each will tow
an additional trailer load of up to 30,000 pounds on the highway and
15,000 pounds cross-country.
Both truck bodies provide 550 cubic
feet of cargo space. The hinged steel sides fold down and away for
loading and unloading operations. Troop seats may be positioned for
troop transport operations. The M925 is equipped with a front winch.
This feature makes it more versatile for operations under difficult