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The M1120 LHS variant was initially introduced as part of the HEMTT overhaul/rebuild programme, during which returned M977 Cargo variants have their cargo bodies and materials handling cranes removed, to be replaced by a Multilift Mark 5 (now designated MPH165-LHS) load handling system, as fitted to the Oshkosh PLS truck.
The Heavy Expanded Mobility Tactical Truck (HEMTT) is an eight-wheel drive, diesel-powered, 10-short-ton (9,100 kg) tactical truck. [2] The M977 HEMTT first entered service in 1982 with the United States Army as a replacement for the M520 Goer, and since that date has remained in production for the U.S. Army and other nations.
The following is a (partial) listing of vehicle model numbers or M-numbers assigned by the United States Army. Some of these designations are also used by other agencies, services, and nationalities, although these various end users usually assign their own nomenclature.
On a model-for-model basis the FMTV is around 3 ft. shorter than its bonneted predecessors, while retaining a C-130 Hercules transport capability. Subject to load dimensions, all original FMTV variants are C-130 transportable at GVWR , and all models capable of being transported underslung by helicopter are fitted with a sliding outrigger system.
The Palletized Load System (PLS) is a truck-based logistics system that entered service in the United States Army in 1993. It performs long and short distance freight transport, unit resupply, and other missions in the tactical environment to support modernized and highly mobile combat units.
All models of the M939 share a common basic chassis, cab, hood, and fenders. The basic truck is a 6×6 (three axles, six wheels, all of which are powered) heavy truck. Early M939s were rebuilds of M809 vehicle chassis with a new automatic transmission, transfer cases, cab, and hood. Suffix –A2 are new production with later model Cummins engine.
Diesel and multifuel trucks had a different model with a ”low” 1st, direct 4th, and overdrive 5th. A 2-speed transfer case engaged the front axle automatically if the rear axles slipped and moved faster than the front axle. Timken axles were used. Gas models had a 6.44:1 final drive gear ratio except for the M129 C/D, which had a 10.26:1 [6]
The M915 has a 855 cu in (14.0 L) Cummins NTC 400 developing 400 hp (300 kW) at 2100rpm and 1,150 lbf⋅ft (1,559 N⋅m) of torque at 1500rpm. The M915A2 had a 775 cu in (12.7 L) Detroit Diesel Series 60 DDEC II developing 400 hp (300 kW) at 2100rpm and 1,400 lbf⋅ft (1,898 N⋅m) of torque at 1200rpm.