OM3017.3 Operation - Section 3 Instrument Panel and Indicator Lights Page 3-25 To adjust RSC control, pull switch (39) "On" and start with dial rotated toward fastest speed while driving truck at desired maximum speed. Relax throttle pedal to let truck coast and turn RSC Adjusting Dial (40) slowly counterclockwise until Dynamic Retarding (22) 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. (41, Figure 3-7) OVERRIDE SWITCH This push-button switch is spring- loaded to the "OFF" postion. When pushed in and held, this switch may be used for several functions.
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 Re- tarding will come on. As truck speed tries to increase, the amount of retarding effort will automatically adjust to keep the selected speed. When truck speed de- creases, the retarding effort is reduced to maintain the selected speed. If truck speed continues to decrease to approximately 3 mph (4.8 kph) below "set" speed, Dynamic Retarding will turn off automatically. If truck speed must be reduced further, the operator can turn Adjust Dial to a new setting or depress the foot oper- ated 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. 1. The override switch permits the operator to move the truck forward when the dump body is raised and the brakes are released. Use of the override switch for this purpose is intended for emergency situations only. 2. If the operator stops the truck on an uphill incline, the override switch can be used to set up forward propulsion while the brakes are applied. As soon as forward propulsion is felt, completely release the brakes and a few seconds later, release the override switch.
For normal truck operation, only dynamic retarding should be used to slow and control the speed of the truck. The Grade/Speed Chart (refer to decal in opera- tor’s cab) should be followed to determine MAXIMUM safe truck speeds for descending various grades with a loaded truck. Service brakes should be applied only when dynamic retarding requires additional force to slow the truck speed quickly and to bring the truck to a complete stop. 3. The push button deactivates the retard pedal func- tion when speed of truck is below 3 mph (4.8 kph). 4. The override switch is also used to reset the Electric System Fault (55) when indicated by the red warning light. NOTE:
STATEX III records the number of "faults/events". When a predetermined number of "faults/events" are recorded within a given time frame, the operator will not be able to reset the fault/event by us- ing the override switch. If this occurs, notify maintenance person- nel immediately .