Sullair 750HH - TROUBLESHOOTING GUIDE

600H, 750, 750H, 750HH, 825, 900, 900H USER MANUAL SECTION 5
64
5.12 TROUBLESHOOTING GUIDE
The following Troubleshooting Chart is based on
both the data obtained from actual tests conducted at
our factory and real applied situations. It contains
symptoms and usual causes for the described
problems. However, DO NOT assume that these are
the only problems that may occur. All available data
concerning the trouble should be systematically
analyzed before undertaking any repairs or
component replacement procedures.
• Check for loose wiring.
• Check for damaged piping.
• Check for parts damaged by heat or an electrical
short circuit, usually apparent by discoloration or a
burnt odor.
Should your problem persist after making the
recommended check, consult your nearest Sullair
representative or the Sullair.
SYMPTOM PROBABLE CAUSE REMEDY
Compressor will not start No fuel Check fuel level and add fuel if necessary.
Plugged fuel filter Replace the fuel filter element.
Battery Check electrolyte level and add distilled water and
recharge if necessary.
Loose battery cables; tighten cables.
Dirty battery cables; clean thoroughly.
Plugged air filter Replace the air filter element.
Engine problems may have developed Refer to Engine Operator’s Manual
Instrument panel problems may have
developed
Refer to Controller Manual.
DEF bad or empty (engine derated) Fill/Replace DEF (Refer to Engine Operator’s
Manual
Compressor shuts down
with air demand present
No fuel Check fuel gauge and add fuel if necessary.
Compressor discharge temperature
switch is open
Cooling air flow is insufficient; clean cooler and
check for proper ventilation.
Low fluid sump level; add fluid.
Dirty compressor fluid filter; change element.
Thermostatic element is not functioning properly;
change the thermostatic element.
Defective discharge temperature switch; check for
a short or open circuit to the engine fuel solenoid.
Should this checkout normal, it could be possible
that the temperature switch itself is defective.
Instrument panel problems may have
developed
Refer to Controller Manual.
DEF bad or empty (engine derated) Fill/Replace DEF (Refer to Engine Operator’s
Manual
Compressor will not build
up full discharge pressure
Air demand is too great Check service lines for leaks of open valves.
Dirty air filter Check the filter gauges on instrument panel and
change element if required.
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 air inlet cylinder Replace cylinder