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5. Starter motor cranks engine when Switching S1 to "I"
but engine does not fire.
a.Switch (S1) defective,
b.Fuel solenoid (Y1) defective.
c.Low battery output.
a.See remedy 4b.
b.Check solenoid and its valve; correct or replace as
necessary.
c.See 1a.
6. Engine fires but general alarm lamp (H2) remains
alight; compressor stops when releasing (S1).
a.Alternator drive belt broken or slipping,
b.Alternator/regulator defective.
a.Check and correct as necessary.
b.Have assembly repaired.
7. Engine is running but shuts down immediately after
S1 has been released
a.Override switch released too soon.
b.Insufficient engine oil pressure.
c.Fuel tank contains insufficient fuel.
d.Engine oil pressure shut-down switch, engine tem-
perature switch or compressor temperature switch
defective.
a.Release switch after engine oil pressure has built up
to above the minimum allowed value.
b.Stop at once, consult the engine Instruction manual.
c.Fill fuel tank.
d.Remove and test switches. Replace if out of order.
8. General alarm lamp (H2) remains alight for over 5
seconds after starting.
a.Insufficient engine oil pressure or too high engine
coolant temperature.
b.Engine oil pressure switch (S3), or compressor
temperature switch (S5) defective.
c.Relay (K1) defective.
a.Stop at once, consult Engine Operation Manual.
b.Stop at once, test switches, replace as necessary.
c.Replace (K1).
9. Hourmeter does not count running time. a.Hourmeter defective. a.Replace.
10. Compressor does not unload and engine keeps run-
ning at maximum speed when closing the air outlet
valves; safety valve blows.
a.Air leaks in regulating system.
b.Regulating valve (RV) incorrectly set or defective.
c.Unloading valve (UV) or its actuating piston stuck.
a.Check and repair.
b.Adjust or repair regulating valve; see Adjustment
of the Continuous Regulating System.
c.Repair unloading valve assembly.
11. Compressor capacity or pressure below normal. a.Air consumption exceeds capacity of compressor.
b.Choked air filter element (AF).
c.Unloading valve (UV) not completely open.
d.Engine does not run at maximum speed.
e.Oil separator element (OS) clogged.
a.Check equipment connected.
b.Service air filter element (AF).
c.Speed regulation cable maladjusted; see Adjust-
ment of the Continuous Regulating System.
d.Check the maximum speed, service the fuel filter.
e.Have element removed and inspected by an Atlas
Copco Service representative.
12. No air output. a.Drive coupling broken. a.Consult Atlas Copco.
13. Working pressure rises during operation and causes
safety valve to blow.
a.See faults 10.
b.Safety valve (SV) opens too soon.
a.See remedies 10.
b.Replace safety valve;
Consult Atlas Copco
Problem Possible faults Corrective actions
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