TM 5-3805-258-24-1
A I R S Y S T E M A N D B R A K E S
S Y S T E M S O P E R A T I O N
AIR SUPPLY FOR THE AIR SYSTEM
A I R S U P P L Y
(Models 950BNS and 950BS)
A I R S U P P L Y
(Models 950BNSCE and 950BSCE)
1. Air compressor. 2. Governor. 3. Drain valve. 4. Line
to air aystam for brakes. 5. Reservoir. 6. Reliaf valva
(safety). 7. Chask valve. 8. Line from air compressor to
air dryar. 9. Lina from air dryer to air rasarvoir. 10. Air dryar.
11. Unloader line from air compressor to air dryer.
Components of the air supply, for Models 950
BNS and 950BS, are a compressor, governor, relief
valve, reservoir and check valve.
Components of the air supply, for Models 950
BNSCE and 950 BSCE, are a compressor, governor,
reservoir, and an air dryer.
Air compressor (1) provides air pressure for the
parking brake and wheel brake air circuits. Gover-
nor (2) controls the pressure for operation of the
air system.
Relief valve (6) controls the maximum pressure
in the air system. Reservoir (5) is used for storage
of air pressure and for collection of water in the
air system.
Check valve (7) prevents the leakage of air
pressure back to the air compressor.
The air dryer is used to remove moisture and
foreign material from the compressed air before it
gets to the air reservoir.
AIR COMPRESSOR AND GOVERNOR
L O C A T I O N O F T H E A I R C O M P R E S S OR
1. Air compressor. 2. Governor.
Air compressor (1), is driven by the accessory drive
gear of the engine. Clean air comes into the air com-
pressor from the intake manifold of the engine. The
compressor gets coolant and lubrication from the en-
gine cooling and lubrication systems.
As seen from the flywheel end of the engine, the air
compressor is fastened to the left side of the front
timing gear housing.
Air compressor governor (2) is fastened to a bracket
near the air compressor. The governor controls the
amount of pressure in the air system and keeps the
pressure constant. Cut-in and cutout pressures for the
governor are shown below.
GOVERNOR AIR PRESSURES
I
2P7609 Governor
I
Models 950BNS and 950BS
Cut-In Pressure
655 k 14 kPa
(95 ~ 2 psi)
Cutout Pressure
756 & 14 kPa
(l10*2mi)
I
4N9680 Governor
Medals 950BNSCE and 950BSCE
I
I
Cut-In Pressure
I
700 + O -35 kPa
(loo +o-5Dsi)
I
Cutout Pressure
825 A 35 kPa
(120 * 5 psi)
I
3-72
