Operator Cab and Controls - Section 32 08/11 OM3212 Page 32-4 ACCELERATOR (THROTTLE) PEDAL Accelerator (throttle) pedal (4, Figure 32-1) is a foot- operated pedal which allows the operator to control engine rpm, depending on pedal depression. HEATER / AIR CONDITIONER COMPARTMENT AND CONTROLS The heater/air conditioner compartment contains heater/air conditioner controls (6, Figure 32-1) and some of the heater/air conditioner components, such as the blower motor assembly and the heater coils. Optimum cab air climate can be selected by using the following controls in various combinations.
Defroster Vent Control Switch Defroster control switch (1, Fig- ure 32-3) directs heated air for windshield defrosting. The down- ward position of the rocker switch is OFF. The upward position of the rocker switch is ON. The foot-operated treadle pedal contains an elec- tronic sensor which sends signals to the Quantum™ fuel control system. The movement of the fuel gover- nor control arm corresponds directly to the travel of the treadle pedal as it is applied by the operator. When the pedal is released, springs return the con- trol arm and the pedal to their "rest" positions and the engine speed returns to low idle.
Heat Vent Control Switch Heater control 2, Figure 32-3) directs heated air to the cab floor for heating of the cab. The down- ward position of the rocker switch is OFF. The upward position of the rocker switch is ON. INSTRUMENT PANEL Fan Control Knob Instrument panel (5, Figure 32-1) includes a center electronic display panel, and L.H & RH panels/pods which contain a variety of switches and indicators. Fan control knob (3, Figure 32-3) is provided to control the cab air fan motor. The fan motor is a 3- speed motor (low, medium and high). Speeds are selected by rotating the control knob clock- wise to the desired position. OFF is in the full counter-clockwise position.
(The fan control must be switched ON for the air conditioner to function.) Refer to Instrument Panel and Indicator Lights later in this section for a detailed description of the func- tion and location of each of these components. Temperature Control Knob Temperature control knob (4, Figure 32-3) allows the operator to select a comfortable temperature. Rotating the knob counter-clockwise (blue arrow) will select cooler temperatures. Full counter-clockwise position is the coldest air setting. Rotating the knob clockwise (red arrow) will select warmer temperatures. The full clockwise position is the warmest heater setting.