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7. Unit does not load after pressing the
loading button.
a. Regulating valve defective. a. Check and if necessary consult Atlas Copco.
8. Engine does not speed up immediately
after compressor loading valve button
has been pressed and compressor does
not deliver air.
a. Regulating valve defective.
b. Air intake throttle valve stuck in closed position.
a. Check and, if necessary consult Atlas Copco.
b. Check and, if necessary consult Atlas Copco.
9. Excessive compressor oil
consumption. Oil mist being
discharged from air outlet valves.
a. Compressor oil level too high. a. Check oil level. Release pressure and drain oil to correct
level.
10. Compressor capacity or pressure
below normal.
a. Air consumption exceeds capacity of compressor.
b. Choked air filter elements.
c. Unloading valve not completely open.
a. Check equipment connected.
b. Remove and inspect elements.
c. Check and, if necessary consult Atlas Copco.
11. Compressor does not unload and
engine keeps running at max. speed
when closing the air outlet valves,
safety valve blows.
a. Regulating valve incorrectly set or defective.
b. Air leaks in regulating system.
c. Unloading valve stuck.
a. Check and, if necessary consult Atlas Copco.
b. Check hoses and their fittings. Stop leaks and, if
necessary consult Atlas Copco.
c. Check and, if necessary consult Atlas Copco.
12. Working pressure rises during
operation and causes safety valve to
blow.
a. Regulating valve incorrectly set or defective.
b. Air leaks in regulating system.
c. Unloading valve stuck.
d. Safety valve defective.
a. Check and, if necessary consult Atlas Copco.
b. Check hoses and their fittings. Stop leaks and, if
necessary consult Atlas Copco.
c. Check and, if necessary consult Atlas Copco.
d. Check safety valve; consult Atlas Copco.
13. After working some time, the unit
stops through a shutdown switch.
a. Fuel tank contains insufficient fuel.
b. Air in fuel system, or insufficient fuel supply.
c. Engine oil pressure too low.
d. Engine temperature too high.
e. Compressor temperature too high.
f. Low coolant level.
a. Fill fuel tank.
b. Check filters and hoses for leaks, dirt and bends.
c. Refer to the engine instruction manual.
d. See corrective actions 15.
e. See corrective actions 16.
f. Top up cooling system.
Problem Possible faults Corrective actions
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