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of Active Stability (SAS), which addresses specific safety issues that are unique to lift truck operation, such as the tendency for the vehicle to tip when maneuvering around a sharp bend. To counteract this problem, the SAS includes an active control rear stabilizer, which is based on a swing lock cylinder that fixes the machine body to the rear axle, helping to maintain vehicle sta- bility and keep all wheels on the ground when making a sharp turn. The system also includes an active mast function control- ler that automatically calculates the critical front and rear tilt angles based on the load and the mast height, and restricts the mast-tilting angle to help reduce the risk of spilling of loads or tipping over forward or backward.

The SAS also incorporates an active steering synchronizer that returns the lift truck’s steering wheel to its original posi- tion after completing a turn, which helps the turning point of the wheel remain constant. Automatic fork leveling helps the operator set the empty forks to the level position with the press of a button.

Toyota offers a travel speed/acceleration control system op- tion on the lift trucks to help secure load handling, as well as an integral sideshifter that improves load capacity retention and forward visibility. Optional ease-of-service features include a built-in analyzer that allows the lift truck to perform self-di- agnostics, and a programmable planned maintenance monitor that alerts the operator to the need for routine service and maintenance. Routine maintenance areas incorporate acces- sibility features such as a one-touch fuel tank bracket, a no- tool floorboard, and the location of the hydraulic filter outside of the hydraulic tank for easier service and replacement.

Toyota’s 8-Series lift trucks will feature Toyota’s new Intelli-Shift option, which helps to protect critical drivetrain components from abusive full-speed directional shift changes.

All 8-Series lift trucks sold in North America are produced at Toyota Industrial Equipment Manufacturing, Toyota Material Handling USA’s Columbus, IN, manufacturing facility.

Darlene Fritz

Hitachi revamps two in rigid dump truck line

Hitachi Construction Machinery recently updated its rigid dump truck lineup with the introduction of the newly re- vamped EH750-3 and EH1100-3 models.

An inline six-cylinder Detroit Diesel series 60 diesel engine powers the EH750-3, while the EH1100-3 is equipped with an MTU Detroit Diesel 12 V series 2000 diesel engine. The engine in the EH750-3 is certified to U.S. EPA Tier 3 and EU Stage III regulations, while the EH1100-3’s engine is certified to EPA Tier 2 and EU Stage II. The fully automatic, planetary-type Allison H5610A (EH750) and H6610A (EH1100) transmissions provide 6F/2R speeds.

Fully fabricated box sections feature frame rails that are ta- pered from front to rear for more even load distribution. Castings have been replaced by cold rolled steel, which is more homogeneous and easier to repair. One-piece top and bottom flanges eliminate crossmember tie-in joints and provide a large exposed center area for access to major components. Large radii at the frame junctions are blended and ground to mini- mize stress concentrations. The frame uses 345-MPa (50.4-ksi) yield high-strength low-alloy steel that is robotically welded to ensure consistent, high-quality welds. For increased strength and longer life, weld joints are oriented longitudinally to the principal flow of stress, and the frame is ultrasonically tested to ensure greater durability and reliability.

The EH750-3 (above) is powered by an inline six-cylinder Detroit Diesel series 60 diesel engine, while the EH1100-3 uses an MTU Detroit Diesel 12 V series 2000 diesel engine.

A single sloped floor in the trucks’ bed promotes even distri- bution of material shedding during dumping. The body is con- tinuously exhaust-heated to reduce carry-back of material and muffle the exhaust. Horizontal floor and side-rail stiffeners help to distribute load shocks evenly over the entire body length,

22 SAE OHE March 2007

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