Sullair 300HH - Page 46

40
375 Caterpillar Standard and Aftercooled/Filtered Operator’s Manual and Parts List
SECTION 5
COMPRESSOR SHUTS DOWN
SYMPTOM PROBABLE CAUSE REMEDY
COMPRESSOR DOES NOT ACHIEVE
FULL DISCHARGE PRESSURE
Run/start switch not in run position For compressors with idle warm-up
controls, switch toggle to RUN for full
operation
Air demand is excessive Check service lines for leaks or open
valves
Dirty air lter Check the lter and change the element if
required
Defective pressure regulator Check the diaphragm and replace with Kit
if necessary
Defective idle warm-up control Replace control
IMPROPER UNLOADING WITH AN
EXCESSIVE PRESSURE BUILD-UP
CAUSING THE PRESSURE RELIEF
VALVE TO OPEN
Pressure regulating valve is set too high Readjust
Control system leak causing loss of
pressure signal
Check control lines
Defective pressure regulating valve.
Repair valve (kit available)
Inlet valve jammed Free or replace valve
Restriction in the control system Check all control lines and components—
ice and/or other contaminants could be
the cause
Defective pressure relief valve opens
when pressure is too low
Replace the pressure relief valve
Defective pressure regulator Check the diaphragm and replace with Kit
if necessary
INSUFFICIENT AIR DELIVERY Run/start switch not in run position For compressors with idle warm-up
controls, switch toggle to RUN for full
operation
Plugged air lter Replace
Defective idle warm-up control Replace control
Plugged air/uid separator Replace separator element and also
change compressor uid and uid lter
Defective pressure regulator Adjust or repair
Engine speed too low Readjust engine speed
EXCESSIVE COMPRESSOR FLUID
CONSUMPTION
Clogged return line Clear orice and return line strainer
Lubrication system leak Check all pipes, connections and
components
Separator element damaged or
malfunctioning
Change separator element