Operator Cab And Controls - Section 32 8/11 OM3232 Page 32-14 Wheel brake lock switch (6, Figure 32-8) should be used with engine running for dumping and loading operations only. The brake lock switch actuates the hydraulic brake system which locks the rear wheel service brakes only . When pulling into shovel or dump area, stop the truck using the foot-operated service brake pedal. When truck is completely stopped and in loading position, move the directional control lever to NETURAL, then apply the brake lock by pressing the top of the rocker switch. To release the brake, press the bottom of the rocker switch.
Wheel Brake Lock Switch Hazard Warning Lights Hazard warning light switch (8, Figure 32-8) flashes all the turn signal lights. Pressing the bottom side of the rocker switch activates these lights. Pressing the top side of the rocker switch turns these lights off. Heater/Air Conditioner Vents Heater/air conditioner vents (9, Figure 32-8) are may be directed by the operator to provide the most comfortable cabin air flow. NOTE: The wheel brake lock will not function if the directional control lever is in the PARK position. Fuel Level Gauge Fuel level gauge (10, Figure 32-8) indicates how much diesel fuel is in the fuel tank.
When there is only 10% of total fuel tank capacity remaining, the amber low fuel level indicator on the gauge will illuminate. Do not use the wheel brake lock switch to stop the truck unless foot-operated treadle valve is inoperative. Use of this switch applies rear service brakes at a reduced, unmodulated pressure. Do not use brake lock for parking. With engine stopped, wheel brake will release. Hydraulic Oil Temperature Gauge Hydraulic oil temperature gauge (11, Figure 32-8) indicates the oil temperature in the hydraulic tank. There are two colored bands: green and red. Pantograph Switch Pantograph switch (7, Figure 32-8) controls the position of the pantograph.
The switch will only operate when the directional control lever is in the “T” (trolley) position. Pressing the top side of the rocker switch will raise the pantograph. Pressing the lower side of the switch will lower the pantograph. Ensure truck is in position under the wires before raising the pantograph. Green indicates normal operation. As the needle approaches the red zone, minimum engine idle speed will increase to help cool the oil. Red indicates high oil temperature in the hydraulic tank. Continued operation could damage components in the hydraulic system.
If this occurs, the operator should safely stop the truck, move directional control lever to PARK and operate the engine at 1200 - 1500 rpm to reduce system temperature. NOTE: If the temperature gauge does not move into the green range after a few minutes, shut down the truck and notify maintenance personnel immediately.