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Problem: Pressure in air receiver rises above maximum and causes safety valve to blow.
Problem: After working some time, the unit stops through a shutdown switch.
Safety valve (SV) leaking. Remove and inspect. Replace if not airtight after reinstallation.
Blow-off valve leaking. Remove and inspect. Replace if necessary.
Possible faults Corrective actions
Regulating valve (RV) opens too late or its ball valve
spring is broken.
Have regulating valve removed and inspected by an Atlas Copco Service
representative.
Air leaks in regulating system. Check hoses and their fittings. Stop leaks; replace leaking hoses.
Air intake throttle valve does not close for some reason. Remove air filters, air intake manifold and throttle valve spring seat.
Withdraw the valve and inspect. Replace parts where necessary. Caution:
the spring seat is fixed with 4 short and 2 long setscrews: first remove the
short screws, then release the spring tension unscrewing the long ones.
Minimum pressure valve malfunctioning. Remove and inspect valve.
Blow-off valve malfunctioning. Remove and inspect valve.
Possible faults Corrective actions
Engine oil pressure too low. Refer to the engine instruction manual.
Compressor or engine overheating. See corrective actions “Compressor overheating”.
Fuel tank contains insufficient fuel. Fill fuel tank.
Low coolant level. Top up cooling system.
Possible faults Corrective actions
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