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PAGE 12
Over-pressurization of the air tank
may cause tank rupture or explosion.
The air tank is protected from over-
pressurization by a safety valve. Do
not eliminate, make adjustments or
substitutions to this device. Occasion-
ally pull the ring on the safety valve
to make sure it operates freely. If it
doesn’t, the safety valve must be
replaced. Innercooler safety valves
used on two stage outfits must be
similarly checked.
The safety valve, Figure 7, is set at the factory to be
pressure approximately 15 pounds higher than the
rated pressure of the outfit. If the unloader valve mal-
functions and does not exhaust compressed air auto-
matically at maximum tank pressure the safety valve
will protect the air tank against excessive air pressure
by popping off at its preset pressure.
Two stage compressors with unloader controls will have
a safety valve on the intercooler, set 50 to 55 pounds.
The purpose of this safety valve is to prevent the full
tank pressure building up in the large, low pressure
cylinder or intercooler.
THROTTLE CONTROL
A gas saving throttle control has been incorporated
on some compressor outfits. During normal operation,
as maximum tank pressure is obtained, the unloader
exhausts compressed air and activates the throttle
control of the engine. The throttle control holds the
engine at a factory set idling speed until air pressure
in the tank drops to reset or minimum tank pressure.
Figure 7. Safety Valve
The unloader then reactivates the throttle control
and accelerates the engine to full throttle.
ADDITIONAL REGULATORS AND
CONTROLS
Since the air tank pressure is usually greater than
that which is needed, a separate regulator is usually
employed to control the air pressure ahead of any
individual air driven device.
The gasoline engine and air compressor
pumps on all compressor outfits are
shipped without oil. Do not attempt to
operate for any reason without first add-
ing oil to the engine and compressor
pump crankcase. Serious damage can
result from even very limited operation
unless filled with oil and broken in
correctly. Make sure to closely follow the
initial startup procedures.
NOTE
The compressor outfit should be placed
on a level surface in a dry, clean, well
ventilated, area. Do not place any mate-
rial on or against the belt guard. This
blocks ventilator openings necessary for
proper compressor cooling.
1. Remove the oil fill plugs on the gasoline engine
and air compressor pump and slowly add oil
until the units are full. Refer to the “Gasoline
Engine Owners Manual” for recommended oils
and fill capacities for the engine. The compres-
sor pump holds approximately 60 fluid oz..
TWO STAGE COMPRESSOR UNITS
2. The air compressor outfit is ready for use.
Room or Ambient
Temperature
Below 20ºF
Above 32ºF
Recommended Oil
(API SG/CD Heavy Duty)
SAE20
SAE30
Viscosity Chart
Crankcase capacity equals approximately 60 fluid
ounces.