Instruments and Controls Identification Ammeter, Optional Forward and Rear Differential Oil Temperature Gauges, Optional An ammeter measures current flowing to and from the battery. When the batteries are charging, the meter needle moves to the plus side of the gauge; when the batteries are being discharged, the needle moves to the minus side. During normal operation, forward and rear differential oil temperature gauges ( Fig. 2.28 ) should read be- tween: Engine Oil Temperature Gauge, Optional 160 to 220°F (71 to 104°C) for Meritor drive axles; 180 to 200°F (82 to 93°C) for Eaton drive axles. During normal operation, the engine oil temperature gauge ( Fig. 2.28 ) should read:
Under heavy loads, such as when climbing steep grades, temperatures up to a maximum of 250°F (121°C) are not unusual. 180 to 225°F (82 to 107°C) for Cummins en- gines; 190 to 235°F (88 to 113°C) for Caterpillar en- gines; CAUTION 200 to 230°F (93 to 110°C) for Detroit Diesel engines. A sudden increase in differential oil temperature that is not caused by a load increase may indi- cate mechanical failure. Bring the vehicle to a safe stop, and investigate the cause to prevent further damage. Do not operate the vehicle until the cause has been determined and corrected.
Under heavy loads, such as when climbing steep grades, temperatures which exceed the normal oil temperature range for a short period are not unusual. CAUTION Turbocharger Boost Pressure Gauge, Optional A sudden increase in engine oil temperature that is not caused by a load increase may indicate mechanical failure. Bring the vehicle to a safe stop, and investigate the cause to prevent further damage. Do not operate the engine until the cause has been determined and corrected. A turbocharger boost gauge ( Fig. 2.28 ) measures the pressure in the intake manifold, in excess of atmos- pheric pressure, being created by the turbocharger.
Pana-Pacific Digital Clock, Optional Transmission Oil Temperature Gauge, Optional A Pana-Pacific clock ( Fig. 2.28 ) has black characters on a constantly backlighted green display, with a brightness that automatically adjusts for day or night. The clock has a 24-hour alarm, with a 3-minute snooze feature. During normal operation, the transmission oil tem- perature gauge ( Fig. 2.28 ) reading should not ex- ceed 250°F (121°C) for Eaton-Fuller transmissions. 1. To set the time of day: 1.1 Push the Run/Set (lower) switch to the right (TIME-SET position). CAUTION A sudden increase in transmission oil tempera- ture that is not caused by a load increase may indicate mechanical failure.
Bring the vehicle to a safe stop, and investigate the cause to prevent further damage. Do not operate the vehicle until the cause has been determined and corrected. NOTE: When the hour setting is for a time between noon and midnight, the small letters "PM" will appear in the lower left corner of the display; no "PM" indicates an A.M. set- ting. 1.2 Advance the hour setting to the correct number by pushing and releasing the hour button as many times as needed. Or, if 2.29