Troubleshooting Guide - Sullair 900XH Operators Manual And Parts Lists

Section 5
MAINTENANCE

5.11 TROUBLESHOOTING GUIDE

SYMPTOM
COMPRESSOR WILL NOT
START
COMPRESSOR SHUTS
DOWNWITH AIR DEMAND
PRESENT
COMPRESSOR WILL NOT
BUILD UP FULL DIS-
CHARGE PRESSURE
IMPROPER UNLOADING
WITH AN EXCESSIVE
PRESSURE BUILD-UP
CAUSING PRESSURE
RELIEF VALVE TO OPEN
38
PROBABLE CAUSE
No Fuel
Plugged Fuel Filter
Low Battery Voltage
Plugged Air Filter
Engine Problems May Have
Developed
Tripped Circuit Breaker on
Instrument Panel
No Fuel
Compressor Discharge
Temperature Switch is Open
Tripped Circuit Breaker on
Instrument Panel
Air Demand is Too Great
Dirty Air Filter
Pressure Regulator Out of
Adjustment
Defective Pressure Regulator
Defective Air Inlet Cylinder
Fluid Charge Lost from Spring
Chamber on Inlet Valve
Pressure Regulating Valve is Set
Too High
REMEDY
Check fuel level and add fuel if necessary.
Replace the element.
Check electrolyte level and add distilled water
and recharge if necessary.
Loose battery cables; tighten cables.
Dirty battery cables; clean thoroughly.
Replace the element.
Refer to Engine Operator's Manual.
Check and reset if necessary.
Check fuel gauge and add fuel if necessary.
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 prop-
erly; change the thermostatic element.
Defective discharge temperature switch;
check for a short or open circuit to the engine
fuel solenoid. Should this check out normal, it
could be possible that the temperature switch
itself is defective.
Check and reset if necessary.
Check service lines for leaks or open valves.
Check the filter gauges on instrument panel
and change element if required.
Adjust regulator according to control adjust-
ment instructions in the Maintenance section.
Check diaphragm and replace if necessary
(kit available).
Replace cylinder.
Add fluid to inlet valve spring chamber by
removing plugs (Fig. 5-3) in the top of the
spring chamber and filling with compressor
fluid. Some fluid may leak from the control
regulator at first but will stop leaking when
fluid level in the spring chamber equalizes.
Readjust.
Continued ...