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Symptom
Compressor oil pressure too
low
Engine does not start
After working for some time,
the unit keeps shutting down
Excessive oil fumes or air
flow coming from breather
pot assembly on gear casing.
Intercooler pressure below
normal
Preliminary
Possible cause
Compressor oil level too low.
Compressor oil filter clogged.
By-pass valve in oil pump stuck in open position.
Oil pump failure.
By-pass valve of oil sump stuck in open position.
Ambient temperature too low.
Compressor oil pressure sensor disconnected.
Engine oil pressure does not build up.
Compressor oil pressure does not build up.
Faulty compressor oil pressure shutdown switch.
ECM fault.
Coolant level(s) too low.
Crank time too short.
Ambient temperature too low.
Speed sensor inoperative.
Insufficient fuel supply.
Temperature or pressure sensor missing or
malfunctioning.
Restriction in fuel supply to engine.
Air leak in fuel suction line or fuel filters.
Compressor oil pressure too low.
Engine oil pressure too low.
Compressor overheating.
Engine overheating.
Compressor element(s) seals defective.
Choked air filter elements.
Intercooler relief valve(s) leaking.
Electric blow-off valve malfunctioning.
Air leak between LP and MP compressor
element.
LP compressor element not in order.
Intercooler clogged internally.
Instruction manual
Corrective action
Before checking compressor oil level, wait
approx. 10 minutes after unit has stopped.
Add correct oil, if necessary. Never overfill.
Replace compressor oil filter.
Remove bypass valve, clean and inspect.
Remove oil pump and inspect parts for wear.
Remove bypass valve, clean and inspect.
Use heaters, check oil viscosity.
Connect wiring.
See Engine Operation Manual.
See problem "Compressor oil pressure too low".
Remove and test switch. Replace, if out of order.
Consult Atlas Copco.
Check and adjust coolant level(s), if necessary.
Adjust crank time on User Interface.
Connect engine heaters.
Check speed sensor and electric wiring.
Check fuel lines or bleed.
Check via the User Interface display and replace
sensor.
Check fuel lines and fuel filters.
Check suction side of electric fuel pump and fuel
filters for air leaks.
See problem "Compressor oil pressure too low".
See Engine Operation Manual.
See "Compressor overheating"
See Engine Operation Manual.
Have compressor element(s) inspected by Atlas
Copco.
Remove and inspect air filter elements.
Clean or replace elements, if necessary.
Remove valve(s), clean and inspect.
Check interstage pressure. Check functioning of
loading solenoid valve. Replace diaphragm of
blow-off valve if necessary.
Inspect pipe connections and intercooler.
Replace leaking O-rings, gaskets or intercooler,
if necessary.
Have LP compressor element inspected by Atlas
Copco.
Consult Atlas Copco.
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