Komatsu 830E-AC Shop Manual page 11

Truck And Engine
The 830E-AC Dump Truck is an off-highway, rear
dump truck with AC Electric Drive. The gross vehicle
weight is 385 852 kg (850,650 lbs.). The engine is a
Komatsu SDA16V160 rated @ 1865 kW (2500 HP).
Alternator (G.E. GTA-41)
The diesel engine drives an in-line alternator at
engine speed. The alternator produces AC current
which is rectified to DC within the main control cabi-
net. The rectified DC power is converted back to AC
by groups of devices called "inverters", also within
the main control cabinet. Each inverter consists of six
"phase modules" under the control of a "gate drive
unit" (GDU). The GDU controls the operation of each
phase module.
Cooling air for the control / power group and wheel
motors, as well as the alternator itself, is provided by
dual fans mounted on the alternator shaft.
AC Induction Traction Motorized Wheels
The alternator output supplies electrical energy to the
two wheel motors attached to the rear axle housing.
The motorized wheels use three-phase AC induction
motors with full-wave AC power.
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 the directional control
lever located on the center console.
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.
A02073 3/06
MAJOR COMPONENT DESCRIPTION
Major Component Description
Operator's Cab
The operator cab has been engineered for operator
comfort and to allow for efficient and safe operation
of the truck. The cab provides wide visibility, with an
integral 4-post ROPS/FOPS structure, and an
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/tele-
scope steering wheel, controls mounted within easy
reach of the operator, and an analog instrument
panel which provides the operator with all instru-
ments and gauges which are necessary to control
and/or monitor the truck's operating systems.
Power Steering
The truck is equipped with a full time power steering
system which provides positive steering control with
minimum operator effort. The system includes nitro-
gen-charged accumulators which automatically pro-
vide emergency 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 electric
system is controlled by the operator through the acti-
vation of the retarder pedal in the operators cab and
by setting the RSC (Retarder Speed Control).
Dynamic Retarding is automatically activated, if the
truck speed goes to a preset overspeed setting.
Brake System
The braking system consists of an all hydraulic actu-
ation system. Depressing the brake pedal actuates
wheel-speed single disc front brakes and armature-
speed dual disc rear brakes. The brakes can also be
activated by operating a switch on the instrument
panel. The brakes will be applied automatically if sys-
tem pressure decreases below a preset minimum.
The parking brake is integral with the service brake
caliper, and is spring-applied and hydraulically-
released. The park brake is applied by moving the
directional control lever to the PARK position.
A2-1