OM3017.3 Operation - Section 3 Instrument Panel and Indicator Lights Page 3-21 (11, Figure 3-7) WATER TEMPERATURE GAUGE (16, Figure 3-7) HIGH BEAM INDICATOR The water temperature gauge indi- cates the temperature of the cool- ant in the engine cooling system. The temperature range after engine warm-up and truck operating under normal conditions should be: The high beam indicator when lit, indicates that the truck headlights are on "High" beam. To switch head- lights to "High" or "Low" beam, de- press dimmer switch located on the floor between service brake and re- tard pedals.
165 o -195 o F (74 o -91 o C) (17, Figure 3-7) RIGHT TURN SIGNAL INDICATOR (12, Figure 3-7) ENGINE OIL PRESSURE GAUGE This indicator illuminates to indicate the right turn signals are operating when the turn signal lever on the steering column is moved upward. Moving the lever to its center posi- tion will turn indicator "Off". The engine oil pressure gauge indi- cates pressure in the engine lubri- cation system in pounds per square inch (psi). Normal operating pressure after en- gine warm up should be:
(18, Figure 3-7) VOLTMETER Idle - 20 psi (138 kPa) Rated Speed - 45 to 70 psi (310 to 483 kPa) (13, Figure 3-7) AIR PRESSURE GAUGE The voltmeter indicates the voltage of the 24V battery system. Normal indicated voltage with engine oper- ating at high RPM, is 27 to 28 volts with batteries in fully charged condi- tion. The air pressure gauge indicates the pressure in the air tank. A normal pressure reading of 115- 135 psi (790-930 kPa) should be indicated. Air pressure should be a minimum of 90 psi (621 kPa), on the gauge before operating the truck. This pressure is required to operate the electrical con- tactors.
When keyswitch (1) is "On" and engine is NOT operat- ing, the voltmeter indicates battery charge condition. (19, Figure 3-7) WARNING DECAL A warning decal is mounted on top of the instrument panel above the voltmeter. This decal warns operator that operating truck (engine operating) with less than 26 volts may result in a loss of dynamic retarding. (14, Figure 3-7) SPEEDOMETER The speedometer indicates the truck speed in miles per hour (MPH). A speedometer that displays kilometers per hour (KM/H) is available.
(15, Figure 3-7) LEFT TURN SIGNAL INDICATOR This indicator illuminates to indicate the left turn signals are operating when the turn signal lever on the steering column is moved down- ward. Moving the lever to its center position will turn indicator "Off". (20, Figure 3-7) BLANK This space not used currently. Reserved for future use.