Troubleshooting
23
Problem
Compressor locks up at 110
psi and higher while under
load:
Note: When checking
hydraulic pump flow, make
sure the air tank is closed
and the compressor is
running.
Compressor will not
operate:
Possible Cause
Weak Hydraulic Motor.
Faulty Hydraulic Pump.
Oil Pressure is low.
Air receiver is full.
12 Volt power is not going to the line
side of the pressure switch.
Faulty Pressure Switch.
Hydraulic Lines not installed correctly.
Air Couplers or hoses are blocked.
Inline Check-Valve is leaking.
Faulty Solenoid Valve.
Compressor is locked up.
Hydraulic motor malfunctioning.
Hydraulic pump malfunctioning.
Solution
If the Hydraulic pump is supplying the
recommended amount of fluid to the hydraulic
motor, replace the hydraulic motor.
If the pump pressure is below the recommended
GPM, replace the Hydraulic pump if necessary.
If the oil pressure gauge is reading in the red
area, the oil pressure is low. See the Low Oil
Pressure entry in this troubleshooting section.
Drain and activate pressure switch.
If there is no power going to the line side of the
pressure switch, trace the wire back to the
power source.
If there is no power going to the solenoid valve,
replace the pressure switch.
Reinstall hydraulic lines.
Locate and remove restriction.
Disassemble, clean, and reinstall or replace.
If there is power going to the pressure switch,
press down on the solenoid valve bypass button.
If the compressor starts to operate, replace the
solenoid valve.
Remove the coupler and lovejoy between the
compressor pump and the hydraulic motor. Turn
the compressor over by hand. If the compressor
turns over freely, the pump is ok. This indicates
there is a possible hydraulic problem.
Inspect and repair.
Check flow and pressure settings.
SHD-43 Troubleshooting
If symptoms of poor performance develop, the following chart can be used as a guide to
investigate and correct the problem. When diagnosing faults in operations of the air
compressor, always check that the hydraulic power source is supplying the correct
hydraulic flow and pressure that is listed in the compressor specification section of this
manual.
Note: To Operate, the American Eagle SHD-43 Compressor needs 10 GPM and
1800 PSI System Pressure.
