Instruments and Controls Identification blinked out either if no faults are found or when all fault codes have been blinked out. 2. Position the DDU range knob to the left to blink active fault codes and to the right to blink inac- tive codes. 1 2 3. To review, test, and clear all fault codes from system memory, use a hand-held diagnostic tool or ServiceRanger. Instruments Tachometer 3 A tachometer ( Fig. 2.19 ) indicates engine speed in revolutions per minute (rpm), and serves as a guide for shifting the transmission and keeping the engine in the appropriate rpm range. For low idle and rated rpm, see the engine identification plate. 01/18/95 f600510a 1. Water Temperature Gauge 2.
Oil Pressure Gauge 3. Pyrometer An optional tachometer is equipped with an engine hour meter to record continuous operating hours of the engine. In cases where actual mileage doesn’t indicate overall usage, maintenance and lubrication intervals for the engine and engine-operated equip- ment can be determined by operating hours. Fig. 2.26, Water Temperature and Oil Pressure Gauges and Pyrometer Speedometer Maximum Water Temperature Engine Model °F (°C) Caterpillar C-10, C-12 216 (102) Caterpillar C-15 225 (107) Cummins L10 212 (100) Cummins NTC 212 (100) Cummins NTC-444 220 (104) Cummins C Series 212 (100) Detroit Diesel 210 (99) A speedometer ( Fig.
2.19 ) registers speed in both miles per hour (mph) and kilometers per hour (km/h). Standard speedometer gauges are equipped with a seven-digit odometer that records total distance trav- eled. An optional speedometer is equipped with a seven- digit odometer, and a four-digit odometer that records trip distance. The trip odometer can be reset to zero by pressing a button near the lower edge of the gauge face. Table 2.2, Maximum Water Temperature Water Temperature Gauge Engine Oil Pressure Gauge The oil pressure gauge ( Fig. 2.26 ) should read as shown in Table 2.3 . During normal engine operation, the water tempera- ture gauge ( Fig. 2.26 ) should read 175 to 195°F (79 to 91°C).
If the temperature remains below 160°F (71°C) or exceeds the maximum temperature shown in Table 2.2 , inspect the cooling system to determine the cause. See the Heavy-Duty Trucks Service Manual for troubleshooting and repair procedures. Engine Model Idle Speed: psi (kPa) Rated Speed: psi (kPa) Oil Pressure * Caterpillar C-10, C-12 10 (69) 43 to 53 (296 to 365) Caterpillar C-15 23 (158) min. 61 to 71 (420 to 490) min. 2.25