Operator's Cab - Komatsu 830E-AC Shop Manual

Retard Speed Control (RSC) Adjust Dial
Dial (8, Figure 5-4) allows the operator to vary the
downhill truck speed that the retard speed control
system will maintain when descending a grade. This
function can be overridden by either the accelerator,
retard lever, or retard pedal.
When the dial is rotated counterclockwise
toward this symbol, the truck will descend
a grade at lower speeds.
When the dial is rotated clockwise toward
this symbol, the truck speed will increase.
Always refer to the Grade/Speed Retard Chart in the
operator's cab and follow the recommendations for
truck operation. DO NOT exceed these recom-
mended MAXIMUM speeds
grades with a loaded truck.
Throttle pedal position will override RSC setting. If
operator depresses throttle pedal to increase truck
speed, dynamic retarding will not come on unless
truck overspeed setting is reached or foot operated
retard pedal is used. When throttle pedal is released
and RSC switch is on, dynamic retarding will come
on at, or above, the RSC dialed speed and will adjust
truck speed to, and maintain, the dialed speed.
To adjust RSC control, pull switch (9) ON and start
with dial (8) rotated toward fastest speed while driv-
ing truck at desired maximum speed. Relax throttle
pedal to let truck coast and turn RSC adjusting dial
slowly counterclockwise until dynamic retarding is
activated. Dynamic retarding will now be activated
automatically anytime the "set" speed is reached, the
RSC switch is on, and throttle pedal is released.
N5-12
when descending
Operator Controls
With RSC switch on and dial adjusted, the system
will function as follows: As truck speed increases to
the "set" speed and throttle pedal released, dynamic
retarding will apply. As truck speed tries to increase,
the amount of retarding effort will automatically
adjust to keep the selected speed. When truck speed
decreases, the retarding effort is reduced to maintain
the selected speed. If truck speed continues to
decrease to approximately 4.8 kph (3 mph) below
"set" speed, dynamic retarding will turn off automati-
cally. If truck speed must be reduced further, the
operator can turn the adjust dial to a new setting or
depress the foot operated retard pedal.
If the operator depresses the foot operated retard
pedal and the retard effort called for is greater than
that from the automatic system, the foot pedal retard
will override RSC.
Retard Speed Control (RSC) Switch
Switch (9, Figure 5-4) turns the system on and off.
Push the knob in for OFF and pull the knob out to
turn the system ON.
10/06 N05070