Mack Other models
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Mack NO (7½-ton 6x6 truck): heavy prime mover with Mack EY engine, 159 hp (118.6 kW) and a five-speed gearbox with transfer case, built as a WWII artillery tractor
Mack Trucks is an American commercial vehicle manufacturer based in Pennsylvania, known for heavy lorries and prime movers. The Mack NO was built as a 7½-ton 6x6 all-wheel-drive truck and served in the Second World War as a heavy prime mover for towing field artillery.
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The NO is powered by a Mack EY engine rated at 159 hp (118.6 kW). Power runs through a five-speed gearbox with an engageable transfer case and low-range gearing, needed for hauling heavy trailed loads over rough ground.
As a prime mover for heavy field guns, the NO had to offer cross-country ability above all else: six-wheel drive and the two-stage transfer case allowed operation off sealed roads, while the closed cab protected the crew. Vehicles of this type formed the backbone of motorised artillery logistics of their time.
On a surviving NO, check the transfer case and axles for wear after decades of use, the brakes for even operation across all axles, and the chassis frame for cracking around the towing hitch. Parts for the Mack EY engine and gearbox are best found through restorers specialising in historic military vehicles. Heavy tractor-and-gun combinations of this kind remained in military service with a number of armed forces long after the war ended, which explains why running examples still turn up with collectors today.
Sources: SpecCodex-Register: Kennwerte des Modells Mack NO 7½-ton 6x6 truck, Mack Trucks
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