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The M809 Series of diesel 5 Ton trucks is available through the
Federal Excess Property Program
(FEPP). All M39 Series trucks have a 5-speed automatic transmission,
Cummins Diesel engine, and are capable of carrying
payloads ranging from 10,000 to 15,000 pounds.
Vehicle Models
Truck, 5 Ton M939 Series Diesel
M923 Cargo without winch*
M925 Cargo with winch*
M927 Cargo XLWB without winch*
M928 Cargo XLWB with winch*
--------------------------------Warning!!!------------------------------------
The Army has discovered there is a high accident and fatality rate with
these vehicles, especially the basic models with the military design
tires. The A1/A2 models do not have as bad a problem, but it still
exists. The Army is retrofitting an "anti-lock" brake system on
their fleet and replacing all the 11:00x20 military design tires with
11:00 R 20 radials of a different tread design. The USMC and Air Force
will be replacing the M939 series trucks with different vehicles. Here
are the following speed restrictions on all M939 series non-modified
vehicles.
Maximum Safe Operating Speeds
Highway: 40 mph
Cross Country: 35 mph
Mud, Snow: 25 mph
Icy conditions: 12 mph
Even though we are not bound by these restrictions, they should be taken
into consideration, especially in "less than ideal" driving conditions
such as wet roads.
--------------------------------Warning!!!------------------------------------
Engine and Transmission
Cummins Diesel
NHC 250, 240 HP @ 2100 RPM, basic and A1
CTA 8.3 210 HP @ 2100 RPM, A2
Governed RPM: 21
Idle RPM: 650 to 700
5 Speed Automatic O/D
Drive Axles: 3
Transfer: 2 Speed, manually shifted, air engaged front
drive (Sprag)
Dimensions
Length, Height of M923: 307.2", height of
118.3", A1/A2: 121"
Length, Height of M925: 310.5", height of
118.3", A1/A2: 121"
Length, Height of M927: 383.2", height of
118.1", A1/A2: 120.6"
Length, Height of M928: 404.7", height of
118.1", A1/A2: 120.6"
Width: 97½" all models
Ground Clearance: 10½", A1/A2: 13.1"
Weights With Cargo Bed**
M923: 21,600 pounds, A1: 22,174 pounds, A2: 20,930 pounds
M925: 22,360 pounds, A1: 23,275 pounds, A2: 22,030 pounds
M927: 27,749 pounds, A1: 25,035 pounds, A2: 23,790 pounds
M928: 27,811 pounds, A1: 26,135 pounds, A2: 24,890 pounds
Payloads
Cross Country Payload: 10,000 pounds
Highway Payload: 10,000 pounds
Towed Load: 15,000 on pintle
Fluids
Cooling System: 47 quarts
Crankcase: 27 quarts with filter change, 23 without, basic and A1
Crankcase: 27 quarts with filter change, 18 without, basic and A2
Differentials: 12 quarts each
Fuel Tank: All cargo 81 gallons
Transmission: 17 quarts
Transfer: 6½ quarts>
Tire Pressure
11:00x20, Highway: 80 PSI front, 50 PSI rear
11:00x20, Cross Country: 60 PSI front, 30 PSI rear
11:00x20, Mud, Sand, Snow: 25 PSI front, 25 PSI rear
14:00 R 20 Super Singles, Highway: 60 PSI***
14:00 R 20 Super Singles, Cross Country: 35 PSI***
14:00 R 20 Super Singles, Mud, Sand, Snow: 25 PSI***
Maximum Speeds At Governed RPM
Basic
| Gear |
Hi |
Low |
| 1st |
12 mph |
5 mph |
| 2nd |
25 mph |
10 mph |
| 3rd |
33 mph |
13 mph |
| 4th |
43 mph |
17 mph |
| 5th |
50 mph |
23 mph |
A1/A2
| Gear |
Hi |
Low |
| 1st |
15 mph |
6 mph |
| 2nd |
29 mph |
12 mph |
| 3rd |
38 mph |
16 mph |
| 4th |
47 mph |
20 mph |
| 5th |
50 mph |
26 mph |
* These are basic models. A1/A2 are upgrades.
** Super singles are on A1/A2 models. The A2 is
equipped with Central Tire Inflation System (CTIS), and the tire
pressure may be changed from the cab. Basic and A1 tire pressure
is changed manually at each tire
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