OM5045 03/13 Major Components & Specifications - Section 50 Page 50-1 MAJOR COMPONENTS AND SPECIFICATIONS Engine Power Steering The Komatsu HD1500-7 dump truck is powered by a Komatsu SDA12V160 diesel engine. This engine is Tier 1 compliant. The HD1500-7 truck is equipped with a full time power steering system. The system provides positive steering control with minimum effort by the operator. Nitrogen-charged accumulators automatically pro- vide emergency power if steering pressure is reduced below an established minimum. Transmission The torqflow transmission is a planetary gear, multi- ple disc clutch transmission.
The transmission is hydraulically actuated and force-lubricated for opti- mum heat dissipation. A three-element, single-stage, two-phase torque converter is mounted to the front of the transmission. Brake System Depressing the brake pedal, or operating the retarder, actuates the hydraulic front and rear service brakes. Both front and rear service brakes are oil- cooled, multiple-disc brakes. The brakes are auto- matically applied when engine speed exceeds the rated revolutions for the shift range. The system includes two nitrogen-charged accumulators for quick response. The accumulators provide second- ary braking if a problem occurs in the primary braking circuit.
The torqflow transmission is capable of seven for- ward speeds and one reverse speed. Automatic shifting is controlled by an electronic shift control sys- tem with automatic clutch modulation in all gears. A lockup system consisting of a wet, double-disc clutch, is activated in F1-F7 gears for increased fuel savings. Final Drive Retarder The final drive consists of a plug-in differential with planetary wheel drive. The operator can manually apply both the front and rear oil-cooled, multiple-disc brakes by actuating the retarding system. The retarder control lever is mounted on the steering column. The retarding system is also equipped with an Auto- matic Retard Speed Control (ARSC) system.
The system automatically applies the retarder to maintain the set speed as initiated by the operator. Refer to Section 32, Operator Cab and Controls, for more information on the ARSC system. Operator’s Cab The HD1500-7 operator's cab has been engineered for maximum operator comfort and to allow for effi- cient and safe operation of the truck. The cab provides for wide visibility, with an integral four-post ROPS/FOPS. It includes the following:
tinted safety-glass windshield, power-operated side windows, deluxe interior with a fully adjustable seat with lumbar support, fully adjustable tilt steering wheel, controls mounted within easy reach of the operator, and an electronic display/monitoring panel to keep the operator informed of the truck's operating circuits. Audible alarms and indicator lights warn the operator of system malfunctions. Suspension Hydro-pneumatic suspension cylinders are mounted at each wheel to reduce shock. The suspensions provide riding comfort for the operator and machine stability for safe travel.