Operating Instructions - Section 32 10/04 OM3215 Page 32-8 Override Switch Push the Retard Speed Control Switch knob IN to turn OFF. This push-button IN switch (9, Figure 32-6) is spring-loaded to the OFF position. When pushed in OFF and held, this switch may be used for several functions: 1. The override switch permits the operator to move the truck forward when the Selector Switch is in Pull the Retard Speed Control Switch Forward, the dump body is raised, and the brakes knob OUT to turn the system ON. are released. OUT ! 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 ON propulsion while the brakes are applied. As soon as forward propulsion is felt, completely release the brakes and as truck begins to move forward, release the override switch. Retard Speed Control (RSC) Adjust Dial 3. The push button deactivates the retard pedal The RSC Adjust Dial (12, Figure 32-6) allows the oper- function when speed of truck is below 3 mph (4.8 ator to vary the downhill truck speed that the Retard kph). Speed Control system will maintain when descending a 4. The override switch is also used to reset an elec- grade.
tric system fault when indicated by the red warn- When the dial is rotated counterclockwise ing light (Refer to “Instrument Panel And Indicator toward this symbol, the truck will descend Lights”, Overhead Warning/Status panel). a grade at lower speeds. 10, Figure 32-6: BLANK When the dial is rotated clockwise toward This position is not currently used. this symbol, the truck speed will increase. Retard Speed Control (RSC) Off/on Switch The Retard Speed Control Switch (11, Figure 32-6) Throttle pedal position will override RSC setting. If the turns the system OFF or ON.
operator depresses the throttle pedal to increase truck speed, Dynamic Retarding will not come on unless truck overspeed setting is reached or foot operated re- tard pedal is used. When the 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.