Major Component Description - Komatsu 730E Operation & Maintenance Manual

OM5060
The Komatsu model 730E standard dump truck is an electric drive, off-highway, rear dump truck with a gross vehi-
cle weight of 324,319 kg (715,000 lbs) that is rated for a nominal payload of 185 t (203 tons). Some Trolley ver-
sions may have a higher GVW. Refer to the grade/speed chart in the operator's cab for the appropriate GVW.
ENGINE
The Komatsu 730E dump truck is powered by a
Komatsu SSA16V159 engine rated at 2000 HP
(1492 kW).
ALTERNATOR (GE GTA-22)
The diesel engine drives an alternator mounted in-
line with the engine. The Alternating Current (AC)
output 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 the 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
four-post Rollover Protective Structure/Falling Object
Protective Structure (ROPS/FOPS),
advanced analog operator environment. It includes a
tinted safety-glass windshield and power-operated
side windows, a deluxe interior with a fully adjustable
seat with lumbar support, a fully adjustable/tilt steer-
ing wheel, controls mounted within easy reach of the
operator, and an analog instrument panel which pro-
vides the operator with all instruments and gauges,
which are necessary to control and/or monitor the
truck's operating systems.

MAJOR COMPONENT DESCRIPTION

and an
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
Dynamic retarding is used to slow the truck during
normal operation or control the 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 operator's cab
and by setting the RSC (Retarder Speed Control).
Dynamic retarding is automatically activated if the
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 the
system pressure decreases below a preset mini-
mum.
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 the 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 50
Page 50-1