Atlas Copco XAHS 347 CD, Instruction Manual

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Problem solving
It is assumed that the engine is in good condition and
that there is adequate fuel flow to the filter and
injection equipment. Make sure that the wires are not damaged and that
they are clamped tight to their terminals.
For denomination of switches, relays, etc., see
Electric system .
See also section Control panel .
Problem: Compressor capacity or pressure below normal.
An electrical fault must be traced by an
electrician.
Possible faults Corrective actions
Air consumption exceeds capacity of compressor. Check equipment connected.
Choked air filter elements (AF). Remove and inspect elements. Clean or replace, if necessary.
Regulating valve (RV) defective. Have regulating valve removed and inspected by an Atlas Copco Service representative.
Blow down valve stuck in open position. Check and correct as necessary.
Loading valve (LV) leaking past O-ring. With compressor running at max. load speed, disconnect hose leading to unloader. If air leaks
from the hose, remove and inspect loading valve. Replace damaged or worn O-rings.
Oil separator element clogged. Have element removed and inspected by an Atlas Copco Service representative.
Air intake throttle valve remains partially closed. 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.
Safety valve (SV) leaking. Remove and inspect. Replace if not airtight after reinstallation.
Blow-off valve leaking. Remove and inspect. Replace if necessary.