1-3
62--11052
1.4
DETAILED DESCRIPTION
1.4.1 Service Valves
The suction and discharge service valves used on the
compressor are equipped with mating flanges for
connection to flanges on the compressor. These valves
are provided with a double seat and a gauge connection,
which allows servicing of the compressor and
refrigerant lines (See Figure 1-1).
Turning the valve stem counterclockwise (all the way
out) will
backseat
the valve to open the suction or
discharge line to the compressor and close off the
gauge connection. In normal operation, the valve is
backseated to allow full flow through the valve. The
valve should always be backseated when connecting
the service manifold gauge lines to the gauge ports.
Turning the valve stem clockwise (all the way forward)
will
frontseat
the valve to close off the suction or
discharge line to isolate the compressor and open the
gauge connection.
To measure suction or discharge pressure, midseat the
valve by opening the valve clockwise about 2 turns. With
the valve stem midway between frontseated and
backseated positions, the suction or discharge line is
open to both the compressor and the gauge connection.
1.4.2 Suction And Discharge Valves
The compressor uses reed type suction and discharge
valves made of highest quality steel for long life. The
valves operate against hardened integral seats in the
valve plate.
The downstroke of the piston admits refrigerant gas
through the suction valve, and then compresses this
gas on the upstroke, thereby raising it’s temperature
and pressure. The compressed gas is prevented from
re-entering the cylinder on it’s next downstroke by the
compressor discharge valve. (See Figure 1-2)
1. Valve Spring
2. Suction Valve
3. Valve Plate
4. Discharge Valve
5. Discharge Valve
Backer
5
1
2
3
4
Figure 1-2. Suction & Discharge Valve
1.4.3 Lubrication System
Force-feed lubrication of the compressor is accomplished
by an oil pump (See Figure 1-3) driven directly from the
compressor crankshaft. Refrigeration oil is drawn from the
compressor crankcase through the oil filter screen and
pick up tube to the oil pump located in the bearing head
assembly. The crankshaft is drilled to enable the pump to
supply oil to the main bearings, connecting rod bearings,
and the shaft seal.
Figure 1-3. Oil Pump
The oil flows to the pump end main bearings, connecting
rod bearings and seal end main bearings, where the oil
path is divided into two directions. The largest quantity
flows to the oil relief valve, which regulates oil pressure
at 15 to 18 psi (1.02 to 1.22 bar) above suction pressure.
When the oil pressure reaches 15 to 18 psi (1.02 to 1.22
bar) above suction pressure, the relief valve spring is
moved forward allowing oil to return to the crankcase.
The remaining oil flows through an orifice and into the
shaft seal cavity to provide shaft seal lubrication and
cooling. This oil is then returned to the crankcase
through an overflow passage.
An additional oil pressure relief valve, built into the oil
pump. It opens at speeds above 400 rpm to relieve a
portion of the oil pressure to the crankcase in order to
maintain oil pressure below an acceptable maximum. At
low speeds, the valve is closed to ensure adequate oil
pressure at 400 rpm. At speeds above 1900 rpm, the oil
pressure will be 25 to 30 psi (1.70 to 2.04 bar) above
suction pressure.
The crankcase pressure equalization system consists of
two oil return check valves and a 1/8-inch pressure
equalization port between the suction manifold and
crankcase. Under normal conditions, check valves are
open and allow for oil return to the crankcase. Under
flooded start conditions, pressure rises in the crankcase
and closes the check valves, preventing excess oil loss.
The equalization port allows for release of excessive
pressure, that has built up in the crankcase, to the suction
manifold; this ensures that the oil loss is kept to a
minimum.
1.4.4 Shaft Seal Reservoir
1. Shaft Seal Reservoir
2. Access Valve (Coreless)
1
2
Figure 1-4. Shaft Seal Reservoir
The shaft seal oil reservoir has been fitted to the
crankcase. The coreless access valve taps into the
crankshaft seal cavity where any oil that escapes the
crankshaft seal will form. The coreless access valve
then drains that compressor oil that escapes the
crankshaft seal into the shaft seal reservoir.
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...