Operation - Section 3 10/00 OM3023 Page 3-16 Operating Instructions (6) Headlights and Dimmer Switch The headlights and dim- mer switch (6, Figure 3- 1) is part of the turn sig- nal lever function. The headlights are turned "Off" and "On" by rotat- ing the switch on the end of the lever handle. The switch has three posi- tions: OFF; Running/ Clearance lights; and Headlights. (9) Throttle Pedal The Throttle Pedal (9) is a foot operated treadle pedal which allows the operator to control fuel to the engine to provide engine accelera- tion. The electronic treadle pedal sends signals to the electronic engine fuel control system.
The movement of the governor control arm corresponds directly to travel of the treadle pedal as applied by the operator. When the pedal is released, a spring returns the pedal and governor control arm to the low idle position. The dimmer switch is part of the turn signal lever function. Pulling the lever up will activate headlights to low beam [A]. Pushing the lever down activates head- lights to high beam [B]. (10) Center Console The Center Console (10, Figure 3-1) is located to the right of the Operator. (7) Retard Control Lever Transmission Range Selector (1, Figure 3-2) The retarder control lever (7) allows the oper- ator to apply only the REAR oil-cooled brakes.
During normal opera- tion, this lever should be used to control the speed of the truck and to stop the truck instead of using the foot-operated service brake pedal. Use of this lever extends front brake life while maintaining maximum control of the truck. The Transmission Range Selector has seven posi- tions (R, N, D, 5, 4, 3, and L). When operating the shift lever, be sure to set it in position securely (detent). If the lever is not in a detent position, the shift position display on the panel may go out and the transmission warning monitor lamp may light up. When shifting between FORWARD and REVERSE, stop the machine completely, and reduce engine speed to low idle when moving the lever.
(8) Brake Pedal The Brake Pedal (8) is a foot-operated pedal which activates air-over-hydraulic pressure converters which apply front caliper dry disc brakes and rear oil-cooled wet disc brakes. This pedal should be used when maneuvering in tight places, at the shovel and dump, and when quick stops or severe braking is required. If the parking brake is not released, and the shift lever is moved to a position other than N, the central warning lamp will flash and the alarm buzzer will sound. If the dump lever is not at the FLOAT position, and the shift lever is moved to a position other than N, the central warning lamp will light up and the alarm buzzer will sound.
Do not move the shift lever with the accelerator pedal depressed. This will cause "shift shock", and will reduce the life of drive train components.