Troubleshooting guide

GENERAL INFORMATION
You have pumhaeed a complete compressoroutfit con-
sistingofan air compressor, ASME approved airtank,
gasolineengine, and associated controlsand instru-
ments. The compressor outfit you have selected is a
two stage stationaryoutfit.
Your new compressor can be used for operatingpaint
sprayers,air tools,grease guns, airbrushes, caulking
guns, and sand blasters, sprayingweed killer and
insecticides, etc. An air pressure regulatormay be
necessary for some ofthese
applications. Refer to Figure1 for a photographof
the compressorand to identifythe majorcomponents
ofthecompressor.
A regularlyscheduled program ofpreventive mainte-
nanceis necessarytoinsurethe longlifethat hasbeen
designed intoyour DeVilbisscompressor outfit.This
instruction manual, along with regular maintenance
willmaintainyourcompressor outfit ingood working
order.Beforeoperatingor performingany maintenance
onyour outfit,referto these publications.
DESCRIPTION OF OPERATION
The gasoline engine uses a pulley and drive belt to
drive the compressor flywheel. The flywheel turns the
compressor crankshaft causing the up and down move-
ment of the pistons in the cylinder; this up and down
movement draws and compresses the air.
On the down strokeofthe piston,airisdrawn inthrough
the air intake. The exhaust valvesremain closed. On
the upstroke of the piston, both the valvesareclosed
and air is compressed in the cylinder. As pressure
buildsinthe cylinderthe exhaust valveopens and the
compressed air is forced out of the cylinder through
the check valve and into the air tank. This process
continuesuntiltheair pressurereachesmaximum tank
pressure.
Working airpressure becomes availablewhenthe com-
pressor has raised the tank pressure above that re-
quired at the air dischargevalve.The air intake must
be keptclear of allobstructions which could interfere
with air delivery to the compressor.
All gasoline compressor outfits are continuouslyrun-
ning outfits controlled bytank pressure. At maximum
tank pressure the unloader valve exhausts air to at-
mosphere (blowoff); tank pressure closes the check
valveretainingairpressureinsidethe tank. Whentank
pressure drops to a pre-determined pressu,=, ;3,=
unloader valve closes, and air pressure opens the
checkvalveallowingcompressed air into the tank.As
maximum tank pressure is reached, if the unloader
valve malfunctions and compressed air is not ex-
haustedat ornear itsblowoff setting,the airtank safety
valve wilt protect the airtank against high pressure by
popping at its factory set pressure. The safety valve
popping pressure is slightly higher than the unloader
valve blowoff pressure.
This compressor outfitis equipped with a gas saving
throttlecontroldevice. When maximumtank pressure
is reached and the unloader valve opens the throttle
controlis also activated, The throttlecontrolholdsthe
engine at a factory set idlingspeed untilair pressure
in the tank drops to reset or minimum tank pressure.
At resetpressure when the unloader valve closesthe
throttle control isreactivated and the engine acceler-
ates to full throttle.
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