OM3241 Operation - Section 32 Operator Cab and Controls Page 32-15 Digital Tachometer Digital tachometer (14, Figure 32-10) displays the engine crankshaft speed in revolutions per minute (rpm). Voltmeter Gauge Voltmeter gauge (19, Figure 32- 10) indicates the voltage of the 24V battery system. Normal indi- cated voltage at high rpm is 27 to 28 volts with the batteries in the fully charged condition. When key switch (1) is in the RUN posi- tion and the engine is stopped, the voltmeter gauge indicates the battery charge condition. Governed rpm:
Low Idle - 750 rpm High Idle, No load - 1950 rpm maximum High Idle, Full Load - 1900 rpm Right Turn Signal Indicator Light Engine Oil Pressure Gauge Right turn signal indicator light (15, Figure 32-10) illuminates to indicate the right turn signals are operating. Engine oil pressure gauge (20, Figure 32-10) indicates the pres- sure in the engine lubrication system in pounds per square inch (psi). Normal operating pressure after engine warm up is 138 - 250 kPa (20 to 35 psi) at idle speed. If oil pres- sure is below this range, a problem may exist. Shut the engine off and notify maintenance personnel.
High Beam Headlight Indicator Light High beam headlight indicator light (16, Figure 32-10), when lit, indicates that the truck head- lights are on high beam. Engine Water Temperature Gauge Engine water temperature gauge (21, Figure 32-10) indi- cates the temperature of the coolant in the engine cooling system. The temperature range after engine warm-up in normal conditions is 74° - 91°C (165° - 195°F). Temperatures outside of this range may indicate a problem. Left Turn Signal Indicator Light Left turn signal indicator light (17, Figure 32-10) illuminates to indi- cate the left turn signals are operating.
Digital Speedometer/Payload Meter Display Digital speedometer / payload meter display (18, Figure 32-10) indicates the truck speed in miles per hour (mph). With an optional speedometer, it may indicate the truck speed in kilometers per hour (kph). The display also shows the payload meter information. For more infor- mation, see Payload Meter, Section 60.