1
Oil level low
Rotary screw
CheckSight glass at running level.
FixTop up with OEM oil.
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2
Clogged oil filter
Rotary screw
CheckΔP indicator; bypass open.
FixReplace filter, check for debris (early sign of airend wear).
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3
Wrong oil viscosity (cold start)
Rotary screw
CheckCompare to OEM spec for ambient.
FixSwitch to correct ISO grade; consider heater for cold environments.
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4
Oil pump failure / drive coupling
Rotary screw
CheckNo pressure rise after start; coupling visually broken.
FixReplace pump or coupling.
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5
Pressure sensor failed
Rotary screw
CheckCompare to mechanical gauge if installed.
FixReplace transducer.
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Safety
Lockout/tagout before opening enclosures. Verify zero energy. Bleed system pressure before opening any pneumatic connection.