OM3232 8/11 Operator Cab And Controls - Section 32 Page 32-13 Key Switch Key switch (1, Figure 32-8) is a four-position (ACC, OFF, RUN, START) switch. The ACC position is not currently used. Retarding Grid Drier Switch Retarding grid drier switch (4, Figure 32-8) is a rocker switch. When in the ON position, this feature is used to dry the retarding grids when starting the truck after it has been washed or parked in rainy conditions. This will minimize the possibility of activating a ground fault due to water in the grids. It can also be used to keep the engine warm in cold conditions because it puts a small amount of load against the engine.
When the switch is rotated one position clockwise, it is in the RUN position and all electrical circuits (except START are activated). 1. With the directional control lever in PARK, turn the key switch fully clockwise to START and hold this position until the engine starts. The START position is spring-loaded to return to the RUN position when the key is released. AC Drive System Rest Switch 2. After the engine has started, place rest switch (5, Figure 32-8) in the OFF position. For more information, refer to “Rest Switch” on the next page. Rest switch (5, Figure 32-8) is a rocker switch with a locking device.
A safety tab on the switch must be pushed to unlock the switch before the top of the switch can be depressed to activate the rest mode. When activated, an internal amber lamp will illuminate. The switch should be activated to de- energize the AC drive system whenever the engine is to be shutdown or parked for a length of time with the engine running. The directional control lever must be in PARK or NEUTRAL and the vehicle not moving to enable this function. This will allow the engine to continue running while the AC drive system is de-energized. Activation of the rest switch alone DOES NOT completely ensure that the drive system is safe to work on.
Refer to Section 20, Safety, for more information on servicing an AC drive truck. Check all "link-on" or "link energized" indicator lights to verify the AC drive system is de- engergized before performing any maintenance on the drive system. DO NOT activate the rest switch while the truck is moving! The truck may unintentionally enter the “rest” mode after stopping. Speed Control Switch Speed control switch (2, Figure 32-8) is a rocker switch. When in the ON position, the speed control lever on the steering column can be used as a “cruise control” function. Traction Control Switch Traction control switch (3, Figure 32- 8) is a rocker switch.
When in the OFF position, the traction control feature is turned off. This can be used in dry operating conditions when the chance of slipping or sliding is minimal so that the drive system will always put maximum power to the ground.