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M939A1 5-ton truck

The M939 series 5-ton 6x6 truck is a family of United States military logistical transportation trucks which was designed in the late 1980s and has been in service ever since. About 32,000 M939 series trucks are in service. The M939 series is an improved version of the older M809 Truck series of trucks.

Contents

Specifications

U.S. Marine Corps M923A1

All models of the M939 share a common basic chassis, motors, etc. The basic truck is a 6x6 (three axles, six sets of tires, all six powered) medium truck. The vehicles have a wide variety of configurations and weights. [1]

Note that the motor and tire specifications, along with other improvements, apply to the A2 versions (and A1 versions) of each base model listed below. There is an M928, an M928A1, and M928A2.

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Engine

The M939 and M939A1 models use a Cummins NHC 250 diesel engine, producing 250 hp.(685 ft·lbf@1500 rpm). The M939A2 models use a smaller Cummins 6CTA8.3 engine producing 240 hp.(745 ft·lbf@1500 rpm). All models have the same automatic transmission.

Tires

The M939 uses 11:00 R20 tires with two tires per side per axle in the rear (rear tandem duals). The M939A1 and M939A2 series use oversized 14:00 R20 tires and rear tandem singles. M939A2 series vehicles use a centralized tire inflation system.

Models

The M939 series includes the following base models:

Model Description Chassis
M923 Basic cargo/transport truck with a soft-top cab 179 in. (454 cm) wheelbase
M925 Same as the M923, but with a 15,000 lb winch on the front 179 in. (454 cm) wheelbase
M927 Extended-body version of the M-923 215 in (546 cm) Extra Long Wheelbase (XLWB)
M928 Same as the M927, but with a 15,000 lb winch on the front 215 in (546 cm) Extra Long Wheelbase (XLWB)
M929 Dump truck 167 in. (424 cm) wheelbase
M930 Same as the M929, but with a 15,000 lb winch on the front 167 in. (424 cm) wheelbase
M931 Tractor-trailer truck 167 in. (424 cm) wheelbase
M932 Same as the M931, but with a 15,000 lb winch on the front 167 in. (424 cm) wheelbase
M934 Enclosed van body, often used as a mobile command post 215 in (546 cm) Extra Long Wheelbase (XLWB)
M936 Wrecker 179 in. (454 cm) wheelbase

Safety

The safety of the M939 series of trucks has been criticised, especially braking performance and stability when loaded. In 1999 the US Army began refitting anti-lock brake systems to the M939 trucks. Until the trucks are modified, they are limited to a 40 mph (65 km/h) top speed by an Army-wide safety order.

Prior to that improvement, 26% of all Army vehicle accidents and 53% of all Army vehicle accident fatalities were in M939 series trucks. From 1987 to 1998 the series made up 9% of the total US Army vehicle inventory, but accounted for 34% of all fatal accidents. [2]

See also

References

  1. ^ TECHNICAL MANUAL OPERATOR’S MANUAL FOR TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL), US Army TM 9-2320-272-10, Accessed 2006-05-04
  2. ^ M939 series information page at globalsecurity.org, Accessed 2006-05-04

External links


The M939 series 5-ton 6x6 truck is a family of United States military logistical transportation trucks which was designed in the late 1980s and has been in service ever since. About 32,000 M939 series trucks are in service. The M939 series is an improved version of the older M809 Truck series of trucks.

Contents

Specifications

All models of the M939 share a common basic chassis, motors, etc. The basic truck is a 6x6 (three axles, six sets of tires, all six powered) medium truck. The vehicles have a wide variety of configurations and weights. [1]

Note that the motor and tire specifications, along with other improvements, apply to the A2 versions (and A1 versions) of each base model listed below. There is an M928, an M928A1, and M928A2.

Engine

The M939 and M939A1 models use a Cummins NHC 250 diesel engine, producing 250 hp.(685 ft·lbf@1500 rpm). The M939A2 models use a smaller Cummins 6CTA8.3 engine producing 240 hp.(745 ft·lbf@1500 rpm). All models have the same automatic transmission.

Tires

The M939 uses 11:00 R20 tires with two tires per side per axle in the rear (rear tandem duals). The M939A1 and M939A2 series use oversized 14:00 R20 tires and rear tandem singles. M939A2 series vehicles use a centralized tire inflation system.

Models

The M939 series includes the following base models:

Model Description Chassis
M923 Basic cargo/transport truck with a soft-top cab 179 in. (454 cm) wheelbase
M925 Same as the M923, but with a 15,000 lb winch on the front 179 in. (454 cm) wheelbase
M927 Extended-body version of the M-923 215 in (546 cm) Extra Long Wheelbase (XLWB)
M928 Same as the M927, but with a 15,000 lb winch on the front 215 in (546 cm) Extra Long Wheelbase (XLWB)
M929 Dump truck 167 in. (424 cm) wheelbase
M930 Same as the M929, but with a 15,000 lb winch on the front 167 in. (424 cm) wheelbase
M931 Tractor-trailer truck 167 in. (424 cm) wheelbase
M932 Same as the M931, but with a 15,000 lb winch on the front 167 in. (424 cm) wheelbase
M934 Enclosed van body, often used as a mobile command post 215 in (546 cm) Extra Long Wheelbase (XLWB)
M936 Wrecker 179 in. (454 cm) wheelbase

Operators

Safety

The safety of the M939 series of trucks has been criticised, especially braking performance and stability when loaded. In 1999 the US Army began refitting anti-lock brake systems to the M939 trucks. Until the trucks are modified, they are limited to a 40 mph (65 km/h) top speed by an Army-wide safety order.

Prior to that improvement, 26% of all Army vehicle accidents and 53% of all Army vehicle accident fatalities were in M939 series trucks. From 1987 to 1998 the series made up 9% of the total US Army vehicle inventory, but accounted for 34% of all fatal accidents. [2]

See also

References

  1. ^ TECHNICAL MANUAL OPERATOR’S MANUAL FOR TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL), US Army TM 9-2320-272-10, Accessed 2006-05-04
  2. ^ M939 series information page at globalsecurity.org, Accessed 2006-05-04

External links


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