page_title: Mack NJU 5-ton 4x4 truck
section_title: Design
hierarchical_section_title: Mack NJU 5-ton 4x4 truck / Design
caption_attribution_description: English: Mack NJU-1.5
context_page_description: The Mack NJU 5- to 6-ton 4x4 Ponton tractor was a semi-tractor designed to haul bridging equipment during World War II. Of the 700 built 119 were supplied to the British in Egypt, 8 were built with van bodies, and the rest were used as a substitute standard by the US Army.
context_section_description: The design was a militarized version of a civilian Cab Over Engine (COE) model, partly redesigned to make it 4WD. A Mack engine and transmission were matched with a Timken 2-speed transfer case and double-reduction axles. The EN532 engine was a 532 cu in (8.7 L)  L-head inline 6 cylinder gasoline engine developing 136 hp (101 kW) at 2500 rpm. The 5-speed transmission drove the separate transfer case.
  A ladder frame had two live beam axles on leaf springs with a 155 inches (3.94 m) wheelbase. There was a 15,000 pounds (6,800 kg) winch behind the front bumper and a pintle hitch at the rear. A civilian type closed cab was used, right behind the cab was an open cargo box used to carry engineer tools, outboard motors, and other equipment.
  Early semi-tractors and all vans used 9.75x20 tires, later semi-tractors had 12.00x20 tires. All trucks had dual rear tires. All trucks had full-air brakes.
caption: Mack NJU-1
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