Operation - Section 32 OM3241 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 chapter 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 in this manual for a complete description of the radio and its functions.
WARNING LIGHTS DIMMER CONTROL Warning lights dimmer control (12, Figure 32-1) per- mits the operator to adjust the brightness of the warning indicator lights. WARNING/STATUS INDI- CATOR 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. Refer to Overhead Status/Warning Indicator Light Panel in this chapter for a detailed description of these indica- tors. FIGURE 32-5. GRADE/SPEED WARNING CHART Refer to the grade/speed warning chart before descending a 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. AIR CLEANER VACUUM GAUGES Air cleaner vacuum gauges (14, Figure 32-1) continuously gauge the air cleaner restriction during operation. The air cleaner(s) must be serviced when the gauge(s) display 6.2 kPa (25 in. H 2 0) . 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 gauge to allow the gauge to return to zero. RADIO SPEAKERS 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 Windshield wipers (15, Figure 32-1) are powered by an electric motor. Refer to Multi-Function Turn Signal Switch in this chapter for a location and description of the windshield wiper and washer controls.