DeVilbiss MG4-OLENG-2B, User Manual

7

ON-RECEIPT INSPECTION

Each air compressor outfit is carefully tested and
checked before shipment. With improper handling,
damage may result in transit and cause problems in
compressor operation.

Immediately upon arrival, check equipment for both
concealed and visible damages to avoid expenses
being incurred to correct such problems. This should be
done regardless of any visible signs of damage to  the

the reserve air pressure in the tank. On outfits with no
pressure regulator, this is also the pressure available
at the air outlet.

Unloader Valve:

  All models are continuously running

outfits controlled by tank pressure. When the maxi-
mum tank pressure is obtained, the unloader valve will
exhaust the compressed air to the atmosphere (blow-
off). When the tank pressure drops to a pre-determined
point, the unloader valve closes and causes the tank
pressure to increase.

Check Valve: 

 When the air compressor is operating,

the check valve is "open", allowing compressed air to
enter the air tank.  When the air compressor reaches
"cut-out" pressure, the check valve "closes", allowing
air pressure to remain inside the air tank.

Safety Valve: 

 If the unloader valve does not release

pressure when tank reaches "blow-off"  pressure, the
safety valve will protect against high pressure by
"popping off" at its factory set pressure (slightly higher
than the pressure switch cut-out setting).

Shut-off Valve:

  Turn the knob counterclockwise to

open the valve and clockwise to close.

Air Compressor Pump: 

 To compress air, the piston

moves up and down in the cylinder.  On the down-
stroke, air is drawn in through the air intake valves.  The
exhaust valve remains closed.  On the upstroke of the
piston, air is compressed.  The intake valves close and
compressed air is forced out through the exhaust
valve, through the outlet tube, through the check valve
and into the air tank.  Working air is not available until
the compressor has raised the air tank pressure above
that required at the air outlet.

Throttle Control:

  A throttle control has been incorpo-

rated as an extra feature. When maximum tank pres-
sure is reached and the unloader valve unloads air, it
also activates a throttle control on the engine. This gas
saving feature holds the engine at a factory-set idling
speed until air pressure in the air tank drops to reset
pressure; it then reactivates the throttle control and
accelerates the engine to full throttle.

Air Intake Filter:

  This filter is designed to clean air

coming into the pump. This filter must always be clean
and ventilation openings free from obstructions. See
"Maintenance".

Tank Pressure Gauge:

  The pressure gauge indicates

DESCRIPTION OF OPERATION

shipping container.  If this product was shipped directly
to you, report any damages to carrier and arrange for
inspection of goods immediately.

For the location or a listing of the nearest DeVilbiss  Air
Power Authorized Warranty Service Center, call our toll
free number at 1-800-888-2468, Ext. 2, and talk with
one of our Service Representatives.