Atlas Copco XRHS 506 Instruction Manual page 88

Problem: Pressure in air receiver rises above maximum and causes safety valve to blow.
Possible faults
Regulating valve (RV) opens too late or its ball
valve spring is broken.
Air leaks in regulating system.
Air intake throttle valve does not close for some
reason.
Minimum pressure valve malfunctioning.
Blow-off valve malfunctioning.
Problem: After working some time, the unit stops through a shutdown switch.
Possible faults
Engine oil pressure too low.
Compressor or engine overheating.
Fuel tank contains insufficient fuel.
Low coolant level.
Problem: Air and oil mist expelles from air filters immediately after stopping.
Possible faults
Check valve at element outlet.
Plunger of oil stop valve jammed.
88
Corrective actions
Have regulating valve removed and inspected
by an Atlas Copco Service representative.
Check hoses and their fittings. Stop leaks;
replace leaking hoses.
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.
Remove and inspect valve.
Remove and inspect valve.
Corrective actions
Refer to the engine instruction manual.
See corrective actions "Compressor
overheating".
Fill fuel tank.
Top up cooling system.
Corrective actions
Remove and inspect. Replace if necessary.
Replace air filter elements and safety cartridges.
Check the oil level and add oil if necessary. Run
the compressor for a few minutes, stop and
recheck oil level.
Remove and inspect. Replace if necessary.
Replace air filter elements and safety cartridges.
Check the oil level and add oil if necessary. Run
the compressor for a few minutes, stop and
recheck oil level.
Instruction Manual
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