SINGLE CYLINDER
AIR COMPRESSOR
TM 5-3805-258-24-1
SYSTEMS OPERATION
AIR COMPRESSOR OPERATION
TYPICAL Al R COMPRESSOR SYSTEM (950BNS and 950BS)
1. Ak tank. 2. Coolant line to engine. 3. Air line from the air inlet manifold for the engine. 4. Coolant line from engine. 5. Air line
to air tank. 6. Air line to unloader valva in heed assembly. 7. Air governor. 6. Prassura gauga. 9. Air Iina to air govarnor. 10. Air
compressor, 11. Oil line from engine for lubrication. 12. Oil outiat to angine.
13. Air Iina to components that naad air for operation.
MODELS 950BNS AND 950BS
The air compressor (10) is a pump that fills tank
(1) with air. The crankshaft in the air compressor is
driven by the engine and the air compressor oper-
ates when the engine is running. The head assembly
gets the coolant from the engine. The coolant goes
through a line (4) connected to the coolant man-
ifold from the water pump of the engine. The cool-
ant goes through the head of the air compressor
and through a line (2) to the coolant manifold to
the radiator of the engine.
When the crankshaft is turning, it moves a con-
necting rod and piston up and down in the cylinder
of the air compressor. When the crankshaft moves
the rod and piston down, the inlet valve in the
head assembly opens and air from the inlet man-
ifold of the engine goes through a line (3), through
the open inlet valve and into the liner of the air
compressor. As the crankshaft turns farther it
moves the rod and piston up and the inlet valve
closes and the exhaust valve opens. The piston
pushes the sir from the cylinder through the open
exhaust valve and through a line (5) to the air tank
(1). The movement of the crankshaft, rods and
piston puts more and more air into the tank and
the pressure of the air gets an increase. The air in
the tank is also in the line (9) to the air governor
(7) and in the line to the pressure gauge (8).
The air compressor puts air into the tank (1) and
in line (9) until the increase in the pressure of the
air gets to the cut out pressure setting of the air
governor (7). The pressure of the air now moves a
plunger in the air governor and the air from the
tank through air line (9) goes through the open
valve in the air governor, through a line (6) and
into the unloader valve in the head which moves
the inlet valve open. As the air compressor piston
moves down, air from line (3) goes through the
open inlet valve into the cylinder. When the piston
moves up, the air in the cylinder moves out
through the open inlet valve but does not go to the
air tank.
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