OM5033 03/13 Major Components & Specifciations - Section 50 Page 50-1 MAJOR COMPONENTS AND SPECIFICATIONS ENGINE POWER STEERING The Komatsu HD1500-5 dump truck is powered by a Komatsu SDA12V160 diesel engine. The HD1500-5 truck is equipped with a full time power steering system which provides positive steer- ing control with a minimum of effort by the operator. The system includes nitrogen-charged accumulators which automatically provide emergency power if the steering hydraulic pressure is reduced below an established minimum.
TRANSMISSION The Torqflow transmission consists of a 3-element, single-stage, two-phase torque converter and a plan- etary gear, multiple disc clutch transmission which is hydraulically actuated and force-lubricated for opti- mum heat dissipation. The Torqflow transmission is capable of seven forward speeds and one reverse gear. Automatic shifting is controlled by an electronic shift control system 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.
BRAKE SYSTEM Depressing the brake pedal, or operating the retarder lever on the RH side of the steering wheel, actuates the hydraulic front and rear service brakes. Both front and rear service brakes are oil-cooled, multiple-disc brakes. These brakes are automatically activated when the engine speed exceeds the rated revolu- tions of the shift position. The system includes two nitrogen-charged accumulators for quick response, and to provide secondary braking if a problem occurs in the primary braking circuit. FINAL DRIVE ASSEMBLY The final drive consists of a plug-in differential with planetary wheel drive.
RETARDER The operator can manually apply both the front and rear oil-cooled, multiple-disc brakes by moving the retarder control lever which is mounted on the steer- ing column, or by using the foot-operated brake pedal. OPERATOR'S CAB The HD1500-5 operator's cab has been engineered for operator comfort and to allow for efficient and safe operation of the truck. The cab provides for wide visibility, with an integral 4- post ROPS/FOPS structure, and an advanced ana- log operator environment.
It includes a tinted safety- glass windshield and power-operated side windows, a deluxe interior with a fully adjustable seat with lum- bar support, a fully adjustable/tilt steering wheel, con- trols 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 used at each wheel to reduce shock and provide riding com- fort for the operator and machine stability.