1
Receiver too small for demand
CheckCalc: 1 gal per CFM minimum; 4 gal/CFM for variable loads.
FixAdd storage / dry receiver.
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2
Cut-in/cut-out band too narrow
CheckTypical band 10–20 PSI for recip; 8–10 PSI for screw.
FixWiden differential on pressure switch.
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3
Leak in control air line
CheckSoap test pilot lines.
FixRepair.
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4
Demand exceeds capacity
CheckLog run/unload times. Loaded > 75% indicates undersized supply.
FixAdd compressor / fix leaks / reduce demand / add storage.
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5
Bad check valve between compressor and tank
CheckHear tank air backing through head/airend after shutdown.
FixReplace check valve.
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Safety
Lockout/tagout before opening enclosures. Verify zero energy. Bleed system pressure before opening any pneumatic connection.