OM3017.2 Operation - Section 3 Operator Cab and Controls Page 3-11 OPERATOR CAB AND CONTROLS FIGURE 3-1. OPERATOR CONTROLS 1. Throttle Pedal 5. Hoist Control Valve 9. 12VDC Power Supply 2. Retard Pedal 6. Selector Switch 10. Computer Diagnostic Port 3. Dimmer Switch 7. Engine Shutdown Switch 11. Data Store Switch 4. Brake Pedal 8. Engine Idle Switch (1) THROTTLE PEDAL (3) DIMMER SWITCH The Throttle Pedal is a foot operated pedal which allows the operator to control engine RPM. The dimmer switch is a foot actuated electric switch. If headlights are on low beam, depression of the switch will change headlights to high beam and high beam indicator on instrument panel will light.
Depressing switch again, changes headlights back to low beam. (2) DYNAMIC RETARDING PEDAL The Dynamic Retarding Pedal is a foot operated pedal which allows the operator to slow the truck without the use of the service brakes to maintain a safe productive speed. The Dynamic Retarding should be used to slow and control the speed of the truck. Service brakes should be used to bring the truck to a complete stop. (4) BRAKE PEDAL The Brake Pedal is a foot operated pedal controlling a hydraulic valve, which modulates pressure to the serv- ice brakes. When Dynamic Retarding is in operation, the engine RPM will automatically go to retard RPM setting.
The Dynamic Retarding system will be applied auto- matically if operator allows speed of truck to reach the predetermined overspeed retard setting.