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Mack NO 7 1/2 Ton 6x6 Truck (G-532)

The combat "N Series" were the first military 6x6 trucks by Mack. The Mack NO was designed as a prime mover for heavy artillery, with a soft top cab for a five man crew. The models NO-1 through NO-7, starting in 1943 with total production about 2000.

A Gar Wood 5MB 40,000 lb. winch was mounted in front and a hoist was mounted at the rear of the bed as a power assist for joining the gun trails of the towed artillery. The cargo body was made of wood.

The huge Mack NO 7 1/2 Ton 6x6 Truck (G532) weighed almost 30,000 lbs empty, could load another 10 tons and pull 25 tons. It was powered by the Mack EY 6 cyl. 707 cid engine with 159hp@2100rpm and 534ft-lb of torque at 800rpm. It had a 5 speed transmission mated to a two speed transfer case.

Manuals for this series of trucks include:

  • Parts List: ORD 9 G532
  • Operators Manual and Maintenance: TM 10-1679

Find additional photos and hi-res versions of the Mack NO 7 1/2 Ton 6x6 Truck at the Olive-Drab Military Mashup:

Mack NJU-1 Ponton 5 to 6-ton 4x4 tractor with bridging equipment on trailer, for a bridge over the Pee Dee River during 1st Army maneuvers in the Carolinas, 15 November 1941. Chevrolet Truck, Carryall, 1/2 Ton, 4x2 at the roadside.
Mack NJU-1 Ponton 5 to 6-ton 4x4 tractors with bridging equipment on trailers, for a bridge over the Pee Dee River during 1st Army maneuvers in the Carolinas, 15 November 1941.
Mack NO 7 1/2 Ton 6x6 Truck, WW II prime mover.
A CAT 10K ATFL is used to load test packages of newly-developed water blivets onto an aircraft service truck prior to being airdropped from a C-17 Globemaster aircraft, Camp MacKall, NC, 10 Nov 2011.
US 1st Army Field Artillery Battalion convoy crosses the Casino Lake Bridge, Bagnoles de l'Orne, France, August 1944.  155mm guns are towed by the Mack NO prime mover 7 1/2-ton 6x6 accompanied by M16 Halftracks and jeeps.
16th FA Brigade Mack NO 7 1/2 Ton 6x6 towing 155mm Long Tom cannon, March 1943.

Thanks to Nico van Gaalen, Rijswijk, Holland, for help with this page.

Mack NO 7 1/2 Ton 6x6 Truck Photo Gallery

Mack NO 7 1/2 Ton 6x6 Truck (G532) with 155mm 'Long Tom' Towed Gun, 16th Field Artillery Brigade, March 1943
Mack NO 7 1/2 Ton 6x6 Truck (G532) with 155mm 'Long Tom' Towed Gun, 16th Field Artillery Brigade, March 1943.

Mack NO 7 1/2 Ton 6x6 Truck (G532) with M36 machine gun ring mount, Aberdeen Proving Grounds, MD, February 1944
Mack NO 7 1/2 Ton 6x6 Truck (G532) with M36 machine gun ring mount, Aberdeen Proving Grounds, MD, February 1944.

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