MAINTENANCE
®SULLAIR®
3700 Operator’s Manual and Parts List
39
COMPRESSOR WILL NOT BUILD FULL
DISCHARGE PRESSURE
Air Demand is Too Great Check service lines for leaks or open
valves up.
Dirty Air Filter Check the filter indicator and inspect
and/or change element if required.
Inlet Valve Bleed Orifice Plugged Insure control line bleed orifice located in
assembly on top of air end is not plugged.
Pressure Regulator Out of Adjustment Adjust regulator according to control
adjustment instructions in the
Maintenance section.
Defective Pressure Regulator Check diaphragm and replace if
necessary (kit available).
Defective Unload Solenoid Valve Check that the valve closes when
energized. Replace the coil or the
complete valve if defective.
LINE PRESSURE RISES ABOVE
UNLOAD PRESSURE SET-POINT
Leak in Control System Causing Loss of
Pressure Signals
Check for leaks.
Inlet Valve Stuck Open Remove the intake hose and check for
inlet valve operation.
Defective Unload Solenoid Valve Check that the valve is open when
de-energized. Replace if necessary.
Plugged Control Line Strainer Clean strainer (screen and o-ring
replacement kit available).
Defective Blowdown Valve Check that sump pressure is exhausted to
the atmosphere when the solenoid valve
opens. Repair or replace if necessary (kit
available).
EXCESSIVE COMPRESSOR FLUID
CONSUMPTION
Clogged Return Line or Orifice Clean strainer (screen and o-ring
replacement kit available).
Clean orifice.
Separator Element Damaged or Not
Functioning Properly
Change separator.
Leak in the Lubrication System Check all pipes, connections and
components.
Excess Fluid Foaming Drain and change.
Fluid Level Too High Drain and change.
PRESSURE RELIEF VALVE OPENS
REPEATEDLY
Defective Pressure Relief Valve Replace.
Plugged Separator Check separator differential.
SYMPTOM PROBABLE CAUSE REMEDY
(Continued)
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