Operator Cab and Controls - Section 32 3/10 OM3216 Page 32-6 RETARDING CAPACITY CHART Retarding capacity chart (8, Figure 32-1 & shown below) provides the recommended maximum truck speeds for descending various grades with a fully loaded truck. RADIO SPEAKERS Radio speakers (9, Figure 32-1) for the AM/FM ste- reo radio are located at the far left and right of the overhead panel. AIR CLEANER VACUUM GAUGES Air cleaner vacuum gauges (10, Figure 32-1) provide a continuous reading of maximum air cleaner restric- tion reached during operation. The air cleaner(s) should be serviced when the gauge(s) reaches 25 inches of H 2 O vacuum. NOTE:
After service, push the reset pin on the face of the gauge to allow the gauge to return to zero. WARNING ALARM BUZZER Warning alarm buzzer (11, Figure 32-1) will sound when activated by any one of several truck functions. Refer to Instrument Panel And Indicators for a detailed description of functions and indicators that will activate this alarm. Reference the retarding capacity chart before descending any grade with a loaded truck. Proper selection of road grade, truck speed, transmission gear range, and use of the retarder lever and/or brake pedal are required to maintain a safe speed.
AM/FM RADIO / CD PLAYER Radio (12, Figure 32-1) is an AM/FM radio with com- pact disc and MP3 capabilities. Refer to Section 70, Cab Radio, for a more complete description of the radio and its functions. Individual customers may use this area for other purposes, such as a two-way communications radio. Customer specified options may cause this decal to change. Refer to the retarding capacity chart in the operator's cab, and follow the recommendations there for safe truck operation. DO NOT exceed these recommended maximum speeds when descending grades with a loaded truck. Refer to Operating Instructions, Retarder Operation, for more information on using the retarder function.
An automatic retard function is available on this truck. For more information refer to Automatic Retard Speed Control later in this chapter.