Mack NM Truck, 6-Ton, 6x6, Cargo


Model NM (G-535)

Mack NM-3
Type 6 ton (5,443kg) 6x6 Prime mover
Production history
Manufacturer Mack
Produced 1940-1944
Number built 8,400+ (all models)
Specifications (NM3[1])
Weight 22,659 lb (10,278 kg)
Length 23 feet 4 inches (7.11 m)
Width 8 feet (2.44 m)
Height 9 feet 11 inches (3.02 m)
Engine Mack EY
Transmission 5 speed x 2 range trf. case
Suspension Live beam axles on leaf springs
Operational
range
 280 mi (450.6 km)
Speed 34 mph (55 km/h)

The Mack NM (G535) was Mack's first military 6x6. It debuted in 1940. The NM's were used for towing AA guns, carrying their crews, and their ammunition. The enclosed cab came from the commercial L-model. Many NM's were used by the British as recovery vehicles.

Technical data

Wheelbase: 14 feet 9 inches (4.50 m)
Overall Dimensions: 23 feet 4 inches (7.11 m) x 8 feet (2.44 m) x 9 feet 11 inches (3.02 m)
Weight: 21,750 lb
Engine: Mack EY 6 cyl. 707-cid (5x6 in.) ohv petrol engine, 170 bhp at 2100 rpm.
Gearbox: Mack TR36 5-speed direct-top
Transfer Case: Timken-Detroit 2-speed T77 with 2.55 low
Tires 9.75-22

Models

NM-1 and NM-2: Amidships, a winch with a capstan head was mounted. It had a short steel cargo body of 11 feet (3.35 m) x 7 feet 4 inches (2.24 m). The cargo body had troop seats, a canvas cover, and a spare tire on the front right side.

NM-2 had smaller head lamps and parking lamps on top.

The NM-3 was the last to have an enclosed cap. It was similar to the NM-1 and NM-2 except for: front pintle for positioning artillery pieces, arched bumper (front pintle under the arche), smaller brush guard, side lights on mudguards, towing hooks on bumper deleted, radiator shell with Mack nameplate.

NM-1, -2 and -3 all had commercial type tires, make Lee, with highway tread.

There has been no NM-4. The prototype NN-2 destined to be this NM has not gone into production.

The NM-5 and -6 had a soft top cab with folding windscreen. It had a wooden cargo body with two spare tires at the front right and left. They had some technical detail changes. Only differences between the NM-5 and -6 were rifle brackets in the cab and jerrycan holders left of the winch for the NM-6.

NM-7 and NM-8 were like the NM-5 and -6. There were only minor detail modifications. Some were equipped with the gun-carriage brake cylinder: this was an air-cylinder from Hanna for the simultaneous actuation (cable operated) of the air brakes of the truck and the mechanical brakes of the gun.

See also

References

  1. ↑ "TM-9-2800-1 Military Vehicles". US Dept. of the Army. Feb 1953. p. 271. Retrieved 30 Dec 2014.


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