OM3226 Operation - Section 32 Operator Cab and Controls Page 32-13 Engine Shutdown Switch With Timer Delay Engine shutdown switch with timer delay (2, Figure 32-11) is a three-position, rocker-type switch (OFF, ON, MOMENTARY). Refer to Timer Delayed Engine Shutdown Switch procedure, Section 30, for a com- plete detailed operation of this switch. Engine Cold Weather Starting Aid Switch Optional engine cold weather starting aid switch (8, Figure 32-11) is spring-loaded to the OFF position. Use only when the ambient temperature is below 10°C (50°F). When the switch is held in the ON position, ether is injected into the engine intake manifold to aid the engine starting in cold weather.
For additional information, refer to Section 30, Engine Start-Up. Fog Light Switch Fog light switch (3, Figure 32-11) is used by pressing the top of the rocker switch to turn the lights on. Pressing the bottom of the switch turns the lights off. The fog lights are optional. Rotating Beacon Light Switch Press rotating beacon light switch (9, Figure 32-11) to the ON position to activate the rotat- ing beacon. This is an optional feature. Ladder Light Switch Ladder light switch (4, Figure 32- 11) turns the ladder lights on and off. Pressing the top of the rocker switch turns the lights on. Press- ing the bottom of the switch turns the lights off.
Another switch is mounted at the front left of the truck near the base of the ladder. Heated Mirror Switch Press heated mirror switch (10, Figure 32-11) to activate the heat- ing element in the mirrors. This is an optional feature. Backup Light Switch Backup light switch (5, Figure 32-11) allows the backup lights to be turned ON providing added visibility and safety when the selector switch (see operator controls) is not in the REV posi- tion. When the switch is pressed toward the ON posi- tion, manual backup light indicator (B4, overhead panel) will be illuminated. Wheel Brake Lock Switch Wheel brake lock switch (12, Figure 32- 11) must only be used when the engine is on.
Use this function during dumping and loading. The brake lock switch actu- ates the hydraulic brake system, which locks the rear wheel service brakes only. When approaching the shovel or dump area, stop the truck using the service brake pedal. When the truck is completely stopped and in the loading position, apply the brake lock by pressing the rocker switch toward the ON symbol. To release, press the rocker switch toward the OFF symbol. Panel Illumination Lights Panel illumination lights (6, Figure 32-11) provide illu- mination for the instrument panel. Brightness is con- trolled by panel illumination lights dimmer rheostat (28).
Cab Air Conditioner/Heater Vents Cab air conditioner/heater vents (7, Figure 32-11) are spherically mounted and may be directed by the oper- ator to provide the most comfortable cabin air flow.