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The Compressor & Governor<br />
The compressor has two adjacent pistons attached to it’s crankshaft which is in<br />
is in constant drive with the engine. When the compressor is “loaded” or<br />
pumping, air is forced through the main discharge line to the reservoirs. As<br />
pressure builds to one of two main standard operating pressures (85 - 105 or 115<br />
115 - 135) the unloading device in the top of the compressor, holds the inlet<br />
valves open and air is pumped between the pistons, allowing the compressor to<br />
compressor to cool. This is the “unloaded” stage. The compressor is controlled<br />
controlled by the governor which is usually mounted to the side of the<br />
compressor. A typical “two-flow” compressor is pictured here.<br />
We need to know...<br />
• The compressor output can be effected by a dirty air filter, loose belts, or worn rings.<br />
• It is usually lubricated by the engine lubrication system. (some have their own)<br />
•During the pre-trip inspection, the compressor is checked visually before engine start-up,<br />
start-up, for belt condition and tension, mounting security, and evidence of oil leaks.<br />
•During the pre-trip inspection, the compressor output is checked. It must be able to pump<br />
pump from 50 to 90 psi. in 3 minutes or less.<br />
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