left-front corner of the radiator; one is located on each side of the engine-compressor crankcase (fig. 8); two are
connected by piping to the air receiver and are accessible through the lower access door at the rear of the housing (fig. 7);
one is tapped into a tube elbow at the top of the slowdown assembly (6, fig. 46); one is located at the shutter air filter
(fig. 15); one is installed in the tubing which connects to the shutterstat (fig. 12); one is located in the compressor valve
closest to the radiator (fig. 8).
b. Purpose. Three of the drain cocks (in the radiator and crankcase) are used solely for draining coolant from the
cooling system. The remaining six drain cocks are used to remove condensation from the air system components.
Figure 15. Shutter air filter.
Section III. OPERATION UNDER USUAL CONDITIONS
29. General
a. The instructions in this section are published for the information and guidance of the personnel responsible for the
operation of this machine.
b. It is essential that the operator know how to perform every operation of which the air compressor is capable.
28