582156110-EN-indC-Pump-20F50 pH.docx 20/11/2020
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11.4 Possible symptoms of faults / Causes of faults / Remedy to be
applied - fast operation
Attention
Before any intervention, it is imperative to follow the
decompression procedure and the safety instructions.
Shut off the air supply with the pressure relief valve in
order to evacuate residual air from the motor,
Depressurize the fluid network by opening the drain
valve of the pump or of the gun.
Defaults Possible causes Remedies
The pump does not start Incorrect air supply Check the pump air supply.
The pump does not work or
stops
The fluid is cured, dried in the
pump
Clean the pump, change the parts if
necessary.
Broken part (s) in the pump Remove, check, replace.
Frosting of the motor Defrost and lubricate using oil.
Outlet fluid hose is blocked Change the hose.
Priming trouble Spray gun shut off
Make sure the spray gun is fully
opened and air is evacuated
through this one.
Air is always coming out from
the spray gun
Check air intake at the fitting or at
the suction rod.
Air does not come out from
the spray gun
Check the pump valves. If a valve is
stuck by dry paint, it can be unstuck
without disassembling it. Blow air
pressure directly in the suction rod.
The pump at stop, the
piston carries on going
down
Exhaust valve or mobile
packing worn or incorrectly
mounted
Check and replace the parts.
Plug or drain valve not
tightened
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