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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:

A Mack NO 7 1/2-ton 6x6 prime mover truck towing a 155mm Long Tom gun into position, Sicily, July 1943.  The Long Tom was the largest artillery piece used by the Allies in Sicily.
Cab interior, Mack NO 7-1/2 ton Truck with Gar Wood 5 MB 40,000-pound capacity winch. This vehicle was Lot 1041 of The Jacques M. Littlefield Collection, Military Vehicle Technology Foundation, Portola Valley, CA, auctioned 11-12 July 2014 by Auctions America. Courtesy:   Auctions America by RM.
Mack NO 7 1/2 Ton 6x6 Truck. Prime Mover, Holabird Quartermaster Depot, circa 1941.
PFC Drain Mackley and SGT Dom Hanover of the 9th Infantry Division operate a Fast Attack Vehicle (FAV), Ft. Lewis, WA, 15 October 1983
155mm Long Tom gun, named Cadet, with Mack NO 7 1/2-ton prime mover and full crew of the 16th FA Brigade is shown ready to go into action on leaving for maneuvers, Camp Gruber, OK, 3 May 1943.
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.

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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