Operation - Section 32 02/10 OM3237 Page 32-4 Operator Cab and Controls OVERHEAD PANEL CONTROLS AND COMPONENTS WARNING ALARM BUZZER Warning alarm buzzer (10, Figure 32-1) will sound when activated by any one of several truck functions. Refer to Instrument Panel in this module for a detailed description of the functions and indicators that will activate this alarm. GRADE/SPEED WARNING CHART Grade/Speed Warning chart (Figure 32-5) provides the recommended maximum truck speeds for descending various grades with a loaded truck. CAB RADIO This panel will normally contain AM/FM radio (11, Figure 32-1). Refer to Section 70 for a complete description of the radio and its functions.
Individual customers may use this area for other purposes, such as a two-way communications radio. WARNING LIGHTS DIMMER CONTROL Warning lights dimmer control (12, Figure 32-1) permits the operator to adjust the brightness of the warning indi- cator lights. This control may not be on all model trucks. WARNING/STATUS INDICATOR LIGHT PANEL Warning/status indicator light panel (13, Figure 32-1) contains various indicator lights to provide the opera- tor with important truck status messages concerning selected truck functions. Refer to Overhead Status/ Warning Indicator Light Panel in this module for a detailed description of these indicators. AIR CLEANER VACUUM GAUGES FIGURE 32-5.
GRADE/SPEED WARNING CHART Air cleaner vacuum gauges (14, Figure 32-1) provide a continuous reading of maximum air cleaner restriction reached during opera- tion. The air cleaner(s) must be serviced when the gauge(s) dis- play 6.2 kPa (25 in.) of H 2 O vac- uum. Refer to the grade/speed warning chart before descending any grade with a loaded truck. Proper use of dynamic retarding will maintain a safe speed. DO NOT exceed the recommended maximum speed when descending a grade with a loaded truck. The grade speed chart may change with optional truck equipment. Refer to the chart in the operator’s cab for the proper speed guidelines. NOTE:
After service, push the reset button on the face of the gauge to allow the gauge to return to zero. RADIO SPEAKERS WINDSHIELD WIPERS Radio speakers (9, Figure 32-1) for the AM/FM radio are located at the far left and right of the overhead panel. Windshield wipers (15, Figure 32-1) are powered by an electric motor. Refer to Multi-Function Turn Signal Switch in this module for a location and description of the windshield wiper and washer controls.