S I N G L E C Y L I N D E RA l R C O M P R E S S O RTM 5-3805-258-24-1S Y S T E M S O P E R A T I O NTYPICAL AIR COMPRESSORINSTALLATION2. Coolant line to engine. 3. Air line from air inlet manifoldof the engine. 4. Coolant line from the angine. 5. Air lineto air tank. 6. Air Iina to unloader valve in haadaaaam-bly. 7. Air governor. 9. Air line fromtank to air govar-nor. 10. Air compressor. 11. Oil line fromengine forlubrication.Components connected to the air line (13) fromthe air tank (1) use the air in the tank and thepressure of the air gets a decrease. When the pres-sure of the air (getting less and less) gets to the cutin pressure setting of the air governor, the plungerin the air governor closes. Now the air from theline (9) can not go through the line (6) to theunloader valve in the head assembly. The air goesout of the line (6) and the unloader valve movesaway from the inlet valve. The inlet valve can againopen and close with the movement of the piston.Air from the air compressor (10) now goes to theair tank (1).AIR GOVERNORNOTE: On models 950BSCE and 950BNSCE theair governor is located on top of the air compressorinstead of the back.A line from the air tank is connected to inlet (5)of the air governor. The pressure of the air in inlet(5) and in chamber (6) is the same as the pressureof the air in the tank. The air in inlet (5) also goesinto an air passage in plunger (8). Spring (10) holdsexhaust valve (11) against the opening in the endof the air passage and the air can not get out ofplunger (8).As the air compressor puts more air into thetank the pressure of the air in the tank and also inchamber (6) gets an increase. The pressure of theair in chamber (6) moves diaphragm (4) against theforce of spring (2). The diaphragm also movesplunger (8). Spring (10) keeps the exhaust valve(11) against the plunger as it moves. The cut outpressure setting of the air governor is when thepressure of the air in chamber (6) has moved dia-phragm (4) and plunger (8) until spring (10) movesexhaust valve (11) against the seat in body (3) andthe air passage in the end of the plunger is open.Now the air from the tank goes through inlet (5),through the air passage in plunger (8) and throughoutlet (7) to the unloader valve in the cylinderhead of the air compressor.AIRGOVERNOR1. Adjustment straw. 2. Spring. 3. Body. 4. Dia-phragm. 5. Inlat. 6. Air chamber. 7. Outlet. 8. Plung-er. 9. Exhaustoutlet. 10. Spring. 11. Exhaust valve.When the air in the tank is used, the pressure ofthe air in the tank gets a decrease. Now spring (2)moves diaphragm (4) and plunger (8). The cut inpressure is when the pressure of the air in the tankand in chamber (6) is less than the force of spring(2) and the spring moves plunger (8) far enough tomove exhaust valve (11) away from the seat inbody (3). Now the air from the unloader valve goesinto outlet (7) and through exhaust outlet (9) andthe unloader valve lets the inlet valve for the aircompressor operate.Adjustment screw (1) can be turned to eithermake an increase or a decrease in the cut out pres-sure setting of the air governor. The cut in pressureis always approximately 15 psi (1.05 kg/cm2) lessthan the cut out pressure setting.AIR COMPRESSOR LUBRICATIONAn oil line from the engine lubricating oil sys-tem is connected to opening (1) in the end cover ofthe air compressor.Pressure oil from opening (1) goes through anopening in the bearing and the main journal of thecrankshaft gets lubrication. The oil goes throughopening (5) in the main bearing journal, through apassage in the crankshaft and through opening (4)in the rod bearing journal. With the oil going outthrough opening (4) and running out between the3-127
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