2
OPERATION
The compressor is driven by the vehicle engine and func-
tions continuously while the engine is in operation. Actual
compression of air is controlled by the compressor unload-
ing mechanism operating in conjunction with a governor.
of the unloader piston and, along with the unloader piston
spring, holds the unloader piston against its seat on the
valve plate. See figures 5 & 7.
NON-COMPRESSION OF AIR (UNLOADED)
When air pressure in the supply reservoir reaches the cut-
out setting of the governor, the governor delivers system
air to the compressor unloader port. Air entering the un-
loader port acts on the unloader piston causing it to move
away from its seat on the valve plate assembly. When the
FIGURE 2 - BA-921 CRANKCASE COVER
AIR INTAKE (LOADED)
During the piston down stroke, a vacuum is created in the
cylinder bore above the piston. The vacuum causes the
inlet reed valve to flex open. Atmospheric air flows through
the open inlet valve and fills the cylinder bore above the
piston. See figures 4 & 7.
AIR COMPRESSION (LOADED)
When the piston reaches approximately bottom dead cen-
ter (BDC), the inlet reed valve closes. Air above the piston
is trapped by the closed inlet reed valve and is compressed
as the piston begins to move toward top dead center (TDC).
When air in the cylinder bore reaches a pressure greater
than that of the system pressure the discharge reed valves
open and air flows into the discharge line and air brake sys-
tem.
Air, during the compression stroke, flows into the hollow
center of the unloader piston through an opening in the end
of the piston. Compressed air acts on the interior surfaces
FIGURE 3 - BA-921 COMPRESSOR UNLOADER SYSTEM
COMPRESSOR
GOVERNOR
SUPPLY RESERVOIR
RESERVOIR
PORT
GOVERNOR
UNLOADER
PORT
FIGURE 4 - OPERATIONAL-LOADED (INTAKE)
PISTON MOVING DOWN
AIR INLET
PORT
INLET
VALVE
OPEN
AIR
DISCHARGE
PORT
DISCHARGE
VALVE
CLOSED
UNLOADER
PISTON
DOWN &
SEATED
VALVE
PLATE
UNLOADER
PORT
FIGURE 5 - OPERATIONAL-LOADED (COMPRESSION)
PISTON MOVING UP
AIR INLET
PORT
INLET
VALVE
CLOSED
AIR
DISCHARGE
PORT
DISCHARGE
VALVE
OPEN
UNLOADER
PISTON
DOWN &
SEATED
VALVE
PLATE
UNLOADER
PORT
Summary of Contents for LE MIRAGE XLII BUS SHELLS
Page 1: ...COACH MANUFACTURER MAINTENANCE MANUAL LE MIRAGE XLII BUS SHELLS PA1564 1ST EDITION...
Page 12: ...Section 00 GENERAL INFORMATION 10 PA1564 FIGURE 13 METRIC US STANDARD CONVERSION TABLE 00005...
Page 13: ...Section 00 GENERAL INFORMATION PA1564 11 FIGURE 14 CONVERSION CHART 00006...
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Page 63: ...SECTION 01 ENGINE PA1564 33 FIGURE 13 POWER PLANT CRADLE INSTALLATION 01140...
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Page 229: ...FAULT CODE MANUAL Created on 00 04 25 15 30 1 FAULT CODE MANUAL B7L B7TL B12...
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Page 379: ...Section 12 BRAKE AND AIR SYSTEM PA1564 21 FIGURE 38 AIR OPERATED BRAKING SYSTEM WE...
Page 380: ...Section 12 BRAKE AND AIR SYSTEM PA1564 22 FIGURE 39 AIR OPERATED BRAKING SYSTEM W5...
Page 387: ...Section 12 BRAKE AND AIR SYSTEM PA1564 29 FIGURE 46 ABS 6S 5M CONFIGURATION...
Page 418: ...16 BW2158 Honeywell Commercial Vehicle Systems Company 4 2001 Printed in USA...
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Page 926: ...PROCEDURE NO SAV00044 REVISION 00 Page 2 of 2 Slide out...
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Page 1086: ...Section 22 HEATING AND AIR CONDITIONING PA1564 18 FIGURE 17 DOUBLE SWEEP EVACUATION SET UP...
Page 1118: ...Section 22 HEATING AND AIR CONDITIONING PA1564 50 FIGURE 54 HEATER LINE SHUTOFF VALVES WE...
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Page 1125: ...Compressor 62 11052 Rev A WORKSHOP MANUAL for MODEL 05G TWIN PORT COMPRESSOR R...
Page 1126: ...WORKSHOP MANUAL COMPRESSOR MODEL 05G TWIN PORT...
Page 1149: ...Compressor 62 11053 Rev B SERVICE PARTS LIST for MODEL 05G TWIN PORT COMPRESSOR 1 2 3 4 5 6 R...
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Page 1223: ...Section 26 XLII SLIDE OUT PA1564 11...
Page 1224: ...Section 26 XLII SLIDE OUT PA1564 12 FIGURE 16 KEYLESS BUSHING INSTALLATION INSTRUCTION...