an electrical circuit from the batteries to the magnetic switch which is mounted on the compressor side of the battery box.
The magnetic switch is energized to complete the circuit between the batteries and the starting motor. The starting motor
pinion then engages the flywheel ring gear to start the engine.
20. Choke
The choke control knob is located on the instrument panel and is connected with a flexible cable to the choke plate in
the carburetor air intake. When the choke control knob is pulled out, the choke plate closes, providing a richer fuel-air
mixture to help start the engine.
Figure 13. Instrument panel.
21. Air Pressure Gage
a. Location. The air pressure gage is located in the center of the instrument panel.
b. Purpose. The air pressure gage indicates the pressure of the air within the air receiver and should read 100 psi
maximum after the unit has been thoroughly warmed up to operating temperatures. The air pressure readings are
approximately'90 psi at the start of the "loading cycle" and 100 psi at the beginning of the "unloading cycle."
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