Section 12: BRAKE AND AIR SYSTEM
PA1564
10
2. Turn the adjustment screw clockwise to
increase the pressure slowly until the re-
quired pressure setting is reached. Tighten
the locking nut.
3. Remove pressure gauge and replace dust
cap on the air pressure check valve.
10. AIR COMPRESSOR (BA-921)
The air compressor is located on starter side of
the engine, on the rear of the engine gear case
(Fig. 8). Its function is to provide and maintain
air under pressure to operate devices in brake
and air systems.
This air compressor also drives the engine fuel
pump which is bolted to the rear end of the
compressor. The compressor crankshaft is
designed to accept a drive coupling which is
placed between the compressor and fuel pump.
The compressor is driven by the bull gear, and
is water cooled. Engine coolant is fed to the
compressor through a flexible hose tapped into
the block water jacket and connected to the rear
of the compressor. Coolant returns from the top
of the compressor (governor side) through a
flexible hose to the engine pump.
The air is taken from the air intake manifold and
entered in the top of the compressor. The
compressed air is pushed into the discharge line
located on side of the compressor, which sends
air to the air dryer. Lubricating oil is supplied to
the compressor by a line from the cylinder block
oil gallery connected to the air compressor.
Lubricating oil returns to the engine crankcase
through the air compressor drive assembly.
Maintenance and repair information on the
Bendix BA-921 air compressor is supplied in the
applicable booklet annexed to this section under
reference number SD-01-676.
FIGURE 8: AIR COMPRESSOR LOCATION
03061
10.1
COMPRESSOR REMOVAL AND
INSTALLATION
1. Exhaust compressed air from air system by
opening the drain valve of each air tank.
2. Drain the engine cooling system. See
Section 5: "
Cooling System
".
3. Identify and disconnect all air, coolant and
oil lines from the compressor assembly.
4. Access the compressor by the engine R.H.
side compartment. Remove the four
compressor mounting bolts and the two fuel
pump support bracket bolts.
5. Slide air compressor rearward to disengage
the hub from coupling. Remove the air
compressor.
Reverse removal procedure for installation.
11. EMERGENCY/PARKING BRAKE
CONTROL VALVE (PP-1)
A push-pull control valve mounted on the L.H.
lateral console is provided for parking brake
application or release. The spring brakes are
self-actuated whenever the control valve supply
pressure drops below 40 psi (275 kPa). In the
UP position, brakes are ON. In the DOWN
position, brakes are RELEASED. A protective
case around the knob prevents accidentally
releasing the brakes.
FIGURE 9: PP-1
12142
Maintenance and repair information on this valve
is supplied in the applicable booklet annexed to
this section under reference number
SD-03-3611.
Remove the valve the following way:
1. Drain the air system.
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...
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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...