Operation - Section 32 OM3226 Page 32-14 Operator Cab and Controls Digital Tachometer Digital tachometer (14, Figure 32-11) displays the engine crankshaft speed in revolutions per minute (rpm). The wheel brake lock is used at the shovel and the dump only to hold the truck in position. DO NOT use this switch to stop the truck, unless the foot-operated treadle valve does not work. Use of this switch applies the rear service brakes with unmodulated pressure! DO NOT use the brake lock for parking because when the engine is stopped, hydraulic pressure will dissipate, allowing the brakes to release! Governed rpm:
Low Idle - 750 rpm High Idle, No load - 1950 rpm maximum High Idle, Full Load - 1900 rpm Right Turn Signal Indicator Light Right turn signal indicator light (15, Figure 32-11) illuminates to indicate the right turn signals are operating. High Beam Headlight Indicator Light High beam headlight indicator light (16, Figure 32-11), when lit, indicates that the truck head- lights are on high beam. Parking Brake Switch Parking brake switch (13, Figure 32-11) is spring-applied and hydraulically released. It is designed to hold the truck stationary when the engine is shut off and the key switch is turned OFF.
The truck must be completely stopped before applying the parking brake, or damage may occur to the parking brake. To apply the parking brake, press the rocker switch toward the ON symbol. To release the parking brake, press the rocker switch toward the OFF symbol. When the key switch is ON and the parking brake switch is applied, parking brake indicator light (A3, overhead panel) will be illuminated. Left Turn Signal Indicator Light Left turn signal indicator light (17, Figure 32-11) illuminates to indi- cate the left turn signals are operating. Digital Speedometer/Payload Meter Display NOTE: DO NOT use the parking brake at the shovel or dump.
With the key switch ON and the engine on, sudden shock caused by loading or dumping could cause the system's motion sensor to release the park brake. Digital speedometer / payload meter display (18, Figure 32-11) 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.