Specifications; Major Component Descriptions - Komatsu 730E Operation & Maintenance Manual

OM5029
The KOMATSU Model 730E Dump Truck is an electric drive, off-highway, rear dump truck whose gross vehicle
weight is 715,000 lbs. (324 324 kg) rated for a maximum payload of 210 tons (190 t).
ENGINE
The KOMATSU 730E Dump Truck is powered by a
Komatsu SSA16V159 engine rated at 2000HP (1492
kW).
ALTERNATOR (GE GTA-22)
The diesel engine drives an alternator mounted in-
line with the engine. The alternating current (AC) out-
put of the alternator is rectified to direct current (DC)
and sent to the DC drive wheel motors.
WHEEL MOTORS (GE 788)
The output of the alternator supplies electrical energy
to the two wheel motors attached to the rear axle
housing. The two wheel motors convert electrical
energy back to mechanical energy through built-in
gear trains within the wheel motor assembly. The
direction of the wheel motors is controlled by a for-
ward or reverse hand selector switch located on a
console to the right side of the operator.
BLOWER
The blower supplies cooling air for the rectifiers, AC
alternator, and to both wheel motors, where it is then
exhausted to atmosphere.
OPERATOR'S CAB
The Operator's Cab for the KOMATSU 730E Dump
Truck 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 analog instrument panel which provides the oper-
ator with all instruments and gauges which are nec-
essary to control and/or monitor the truck's operating
systems.
MAJOR COMPONENT DESCRIPTION
POWER STEERING
The KOMATSU 730E Dump Truck is equipped with a
full time power steering system which provides posi-
tive steering control with a minimum of effort by the
operator. The system includes nitrogen-charged
accumulators which automatically provide emer-
gency power if the steering hydraulic pressure is
reduced below an established minimum.
DYNAMIC RETARDING
The dynamic retarding is used to slow the truck dur-
ing normal operation or control speed coming down a
grade. The dynamic retarding ability of the DC elec-
tric system is controlled by the operator through the
activation of the retarder pedal in the operators cab
and by setting the RSC (Retarder Speed Control).
Dynamic Retarding is automatically activated if truck
goes to a preset overspeed setting.
BRAKE SYSTEM
The wheel service brakes are caliper/dry disc brakes
applied by an all hydraulic actuation system.
Depressing the brake pedal actuates wheel-speed
single disc front brakes and armature-speed dual
disc rear brakes. The rear brakes can also be acti-
vated by operating a switch on the instrument panel.
All wheel brakes will be applied automatically if sys-
tem pressure decreases below a preset minimum.
The parking brake is a caliper/disc type, mounted on
each rear wheel motor, and is spring-applied and
hydraulically-released with wheel speed application
protection (will not apply with truck moving).
SUSPENSION
HYDRAIR®II suspension cylinders located at each
wheel provide a smooth and comfortable ride for the
operator and dampens shock loads to the chassis
during loading and operation.
Specifications - Section 5
Page 5-1