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Like the EH750, the EH1100 rigid dump truck (above) offers a low loading height and large target area to facilitate eas , quick loading by a variety of loading tools.

minimizing stress concentrations in any one area. Closely spaced floor stiffeners also help to reduce wear due to impact loading.

The EH750-3 body uses a 16-mm (0.63-in) floor plate and 8-mm (0.31-in) side plates made from 400 BHN high- tensile steel, which helps to provide high resistance to wear and impact. The EH1100 body uses the same 8-mm (0.31-in) side plates, but a slightly thick- er, 18-mm (0.71-in) floor plate. A low loading height and large target area facilitate easy, quick loading by a variety of loading tools.

Both trucks use Hitachi’s Accu-Trac suspension system with independent trailing arms for each front wheel. The design features pivot mounting, which allows only axial input to the strut and wheel movement to the vertical plane. The trailing arm layout also helps to reduce vehicle weight by eliminating the frame bulk that would be needed for mounting the king-pin.

Dynamic friction (sidewall force) within the strut is also reduced with the Accu-Trac design, which thus allows the use of a lighter strut engineered to a smaller diameter and longer stroke. Hitachi uses Neocon struts, which con- tain energy-absorbing helium and com- pressible silicone-based Neocon-E fluid to provide improved isolation, stability, and control, as well as longer equipment life, greater operator comfort, and more-predictable machine performance.

wider front track that Hitachi says pro- vides a better ride, improved stability, and a reduced turning circle. The struts are mounted with spherical bushings to eliminate extreme sidewall forces by ensuring a purely axial input to the ride strut. The rear struts are mounted more vertically, which allows a more pure axial loading, thus reducing the tractive and braking forces transmitted to the nose cone. The front struts can be re- moved and installed without removing the trailing arms, brakes, or tires.

The frame and Accu-Trac suspension system are designed to work in unison to provide maximum structural integrity and operator comfort. The fabricated rectan- gular frame rail construction provides resistance to bending and torsional loads while eliminating unnecessary weight.

Both trucks use hydraulic actuated front dry disc breaks and rear wet disc brakes. Located at the rear axle, the wet disc brakes provide service braking, secondary braking, and retarding. The wet disc brakes, which are oil-cooled, employ a multiplate design and are sealed for protection against environ- mental contamination. A unique vari- able front-to-rear brake proportioning maximizes stop performance under slip- pery road conditions.

An optional pump-fed auto-lubrica- tion system applies grease to all lube points, which automatically delivers metered quantities of lubricant accord- ing to a time-based schedule.

Struts are mounted between the

Darlene Fritz

king-pins and the frame, creating a


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