Komatsu 830E Shop Manual page 39

7. Do not stop or park on a haul road unless
unavoidable. If you must stop, move truck to a
safe place, apply parking brake, and shut down
engine before leaving cab. Block wheels
securely and notify maintenance personnel for
assistance.
8. Before starting up or down a grade, maintain a
speed that will insure safe driving and provide
effective retarding under all conditions (refer to
"DYNAMIC RETARDING OPERATION"). The
Grade/Speed Chart in the operator's cab should
always be referenced to determine MAXIMUM
safe truck speeds for descending various
grades with a loaded truck.
9. When operating truck in darkness, or when visi-
bility is poor, do not move truck unless all head-
lights, clearance lights, and tail lights are on. Do
not back truck if back-up horn or lights are inop-
erative. Always dim headlights when meeting
oncoming vehicles.
10. If the "Emergency Steering" light and/or "Low
Brake Pressure Warning" light (if equipped) illu-
minate during operation, steer the truck imme-
diately to a safe stopping area, away from
other traffic if possible. Refer to item 7 above.
11. The Statex III system monitors wheel motor,
ambient, and static exciter temperatures. If
wheel motor or static exciter temperature is out-
side the limits established, the Statex III con-
trols will cause the engine to increase to 1650
RPM. (Normal engine RPM for haul road/retard-
ing operation is 1250 RPM).
12. When maximum truck speed is reached, the
truck will experience a DECREASE in engine
RPM.
13. Check tires for proper inflation periodically dur-
ing shift. If truck has been run on a "flat", or
under-inflated tire, it must not be parked in a
building until the tire cools.
DYNAMIC RETARDING OPERATION
Dynamic Retarding is a braking torque (not a brake)
produced through electrical generation by the wheel-
motors when the truck motion (momentum) is the
propelling force. For normal truck operation, Dynamic
Retarding should be used to slow and control the
speed of the truck.
A03020
Dynamic Retarding is available in "Forward/Reverse"
at all truck speeds above 0 mph/kph; however, as the
truck speed slows below 3 mph (4.8 kph), the avail-
able retarding force may not be effective. Use the
service brakes to bring the truck to a COMPLETE
stop.
Dynamic Retarding will NOT hold a stationary truck
on an incline; use the Parking Brake or Wheel Lock
brake for this purpose.
Dynamic Retarding is available in "Neutral" only
when truck speed is above 3 mph (4.8 kph).
When dynamic retarding is in operation, the engine
RPM will automatically go to an advance RPM retard
speed setting (usually 1250 RPM*).
NOTE: The exact engine speed in retarding may vary
due to the temperature of certain components; this is
controlled by the Statex III control system.
Dynamic retarding will be applied automatically, if
the speed of the truck reaches the predetermined
overspeed retard setting. Any application of the
Dynamic retarding system (automatic or foot pedal)
will cause an indicator light to illuminate in the over-
head display panel.
OPTIONAL - DUAL FUNCTION / SINGLE PEDAL
The Dynamic Retarder/Service Brake Pedal is a sin-
gle, foot-operated pedal which controls both retard-
ing and service brake functions. Thus, the operator
must first apply, and maintain, full dynamic retarding
in order to apply the service brakes. Releasing the
pedal returns the brake and retarder to the "Off" posi-
tion.
When the pedal is partially depressed, the dynamic
retarding is actuated. As the pedal is further
depressed to where dynamic retarding is fully
applied; the service brakes (while maintaining full
retarding) are then actuated through a hydraulic
valve, which modulates pressure to the service
brakes. Completely depressing the pedal causes
full application of both dynamic retarding AND
the service brakes. An indicator light in the over-
head panel will illuminate, and an increase in pedal
resistance, will be felt when the Service Brakes are
applied.
For normal truck operation, Dynamic Retarding
should be used to slow and control the speed of the
truck.
General Safety and Operating Instructions A3-25