
Operation 9
General Information
To use the compressor, start the vehicle engine and
engage the hydraulic system. The compressor can
now be activated using the compressor switch. This
energizes the hydraulic solenoid sending oil to the
hydraulic drive motor and starts the compressor.
Through the air pressure switch and pilot valve, the
system will now function automatically. Once
engaged, adjust the engine speed control to ensure
that the compressor speed does not exceed 1000
RPM under load. Adjustment instructions are
provided with the speed control unit.
Air Pilot Valve Operation
(Head Unloading System)
When the hydraulic system is engaged the
compressor will pump air into the receiver until the
pressure reaches 175 psi. At this time the air pilot
valve senses the pressure in the receiver and
engages an intake valve hold-open mechanism.
The compressor will run free until the pressure in
the receiver falls below 145 psi and the air pressure
valve disengages the intake valve hold-open
mechanism to allow the compressor to pump air.
See head unloading system for detailed views and
adjustment instructions on the next page.
Hydraulic otor Bypass Circuit
The hydraulic motor is equipped with a bypass circuit
which protects the compressor from over speed.
When the compressor is pumping, all hydraulic oil
flows through the hydraulic motor. When the
compressor is running free, some oil is bypassed
around the hydraulic motor preventing the
compressor from speeding up until the engine speed
control disengages. The bypass circuit, in conjunction
with the engine speed control will cause the
compressor to turn very slowly when not pumping.
This is normal operation. When air is again required,
the engine speed control engages, the bypass circuit
closes and the compressor will operate at speed. The
bypass circuit is set at the factory, no adjustment is
necessary.
Operating Notes:
This reciprocating compressor must not be used for
breathing air. To do so will cause serious injury
whether air is supplied direct from the compressor
source or to breathing tanks for later use. Any and
all liabilities for damage or loss due to injuries, death
and/or property damage, including consequential
damages stemming from the use of this compressor
to supply breathing air will be disclaimed by the
manufacturer.
The use of this compressor as a booster pump
and/or to compress a medium other than
atmospheric air is strictly non-approved and can
result in equipment damage and/or injury. on-
approved uses will also void the warranty.
ever use plastic pipe or improperly rated metal
pipe. Improper piping materials can burst and cause
injury or property damage.
Before Start-Up
Inspect unit for any visible signs of damage.
Check the oil level in the compressor with the dipstick on the unit. If oil is needed, use American Eagle
synthetic compressor oil (P/ C0087) or an equivalent synthetic oil. Note: There may be oil left in the
crankcase from the factory bench test. Overfilling may cause the compressor to back blow oil.
Always check the oil level and fill to the designated marking on the dipstick before putting the unit
into service.
Check hoses (air and hydraulic) for weak or worn condition and make sure that all connections are secure.
Check the air intake filters on each head to make certain that they are clean and unobstructed. Dirty air
filters are a possible cause of reduced air output.
Each compressor is bench tested under load at the factory to ensure proper break-in and operation. While it
is not necessary to follow any break-in procedure, the following checks should be made before putting the
unit into service and periodically during use.
Chapter 3: Operation