Stewart & Stevenson Services Inc., Houston, Texas, has been awarded the Medium Tactical Vehicles (FMTV)A1 Competitive Rebuy (A1CR) contract to produce trucks and trailers for the US. Army The contract was awarded by the U.S. Army's Tank-Automotive and Armament Command (TACOM) and is potentially worth as much as $2 billion. Stewart & Stevenson won the contract over Oshkosh Truck Corp.
The five-year contract calls for an estimated 11,000 multi-use medium tactical vehicles and trailers for the Army, with an option for 12,000 more. Production of the FMTV A1CR is expected to begin in the fourth quarter of 2004.
Stewart & Stevenson Tactical Vehicle Systems LP is the prime contractor for the U.S. Army's current family of Medium Tactical vehicles (FMTV), a contract hadn't been competitively rebid since it was awarded in 1991. The current FMTV trucks indude 2.5 ton and 5 ton trucks in more than 15 variants, and are manufactured by S&S in Sealy, Texas. Since winning the 1991 FMTV contract, the S&S has manufactured more than 20,000 trucks and trailers.
According to Stewart & Stevenson, its proposal featured enhancements to the FMTV A1 including an EPA 2004 compliant engine, soldier-suggested enhancements, greater reliability and additional reductions in life cycle costs and logistics burden.
While S&S has not announced sourcing details for the A1CR, the current generation FMTY trucks are powered by what was known as the Caterpillar model 3126 diesel and is now the C7. The 7.2 L six-cylinder, turbocharged and aftercooled diesel is rated 275 hp in the 2.5 ton truck and 330 hp in the 5 ton version, both at 2400 rpm. Torque at 1600 rpm is 817 lb.ft. in 2.5 ton truck and 851 lb.ft. in the 5 ton version. The engine is capable of running on diesel fuel, DF-2, JP-4, JP-8 or VV-F-800 fuels.
The diesel drives an Allison MD 3070 PT automatic/select seven-speed, electronically controlled transmission with fill-time all-wheel drive with integral transfer case. In normal operations, there is a 30 percent front, 70 percent rear torque split. In the off-road use, the torque is split equally equal front and rear.
The front, intermediate and rear axles on the current models are ArvinMeritor single-reduction, amboid-gearing carrier models with a bevel wheel end reduction ratio of 2:1 and an overall gear ratio of 7.8:1. The front axle steering angle is 350 The FMTV trucks were the first tactical vehicles to use an anti-lock braking system, S&S said, with the system on the current trucks being a dual-circuit, four-channel system with trailer ABS connectors for emergency towing.
Other componentry on the current FMTV trucks includes: power-assisted, recirculating ball steering; all-terrain 395/85R20XML tires; and a parabolic-tapered leaf spring with hydraulic shock absorbers on the front suspension. The rear suspensions include a parabolic-tapered leaf spring suspension with hydraulic shock absorbers and stabilizer bar on the 2.5 ton truck, while the 5 ton models have tandem axles with parabolic-tapered leaf spring with hydraulic shock absorbers and stabilizer bar.
The FMTV trucks also feature a central tire inflation system (CTIS) with cab-mounted electronic controls that are operable while driving. The CTIS system can operate in five modes; highway, cross-country air transport, sand/mud/snow and emergency.
S&S said the FMTV is the largest payload capacity army truck transportable via C-130 aircraft with full payload and can be helicopter lifted via integral "Heli-lift" arms that also aid in ship loading. The truck can be prepared for air transport in as little as seven minutes and certain truck variants are certified for Low Velocity Air Drop (LVAD).
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