Operator Cab and Controls - Section 32 3/10 OM3216 Page 32-4 Service brake pedal (3, Figure 32-3) is a single func- tion, foot-operated pedal which controls and modu- lates service brake pressure directly through a hydraulic valve. SERVICE BRAKE PEDAL The foot-operated treadle pedal contains an elec- tronic sensor which sends signals to the Quantum™ fuel control system. The movement of the fuel gover- nor control arm corresponds directly to the travel of the treadle pedal as it is applied by the operator. When the pedal is released, springs return the con- trol arm and the pedal to their rest positions and the engine speed returns to low idle.
When the pedal is depressed, the service brakes are actuated through a hydraulic valve, which modulates pressure to the service brakes. Completely depress- ing the pedal causes full application of both the front and rear oil disc service brakes. Refer to retarding capacity chart (8, Figure 32-1) to determine maximum safe truck speeds for descend- ing various grades with a loaded truck. INSTRUMENT PANEL Instrument panel (5, Figure 32-1) includes a center electronic display panel, and LH & RH switch panels that contain a variety of switches.
ACCELERATOR PEDAL Refer to Instrument Panel And Indicators later in this section for a detailed description of the function and location of each of these components. Accelerator pedal (4, Figure 32-3) is a foot-operated pedal which allows the operator to control engine rpm, depending on pedal depression. FIGURE 32-3. PEDALS 3. Brake Pedal 4. Accelerator Pedal