20/11/2020 582156110-EN-indC-Pump-20F50 pH.docx
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Defaults Possible causes Remedies
The pump at stop, the
piston carries on going up
Suction valve worn or
incorrectly mounted
Check and replace the parts.
Plug or drain valve not
tightened
The pump does not reverse
Spring of the air motor
reversing block damaged or
worn
Check and replace the spring of the
reversing block.
Lack of lubrication of the
reversing block
Lubricate the reversing block with HP
150 oil.
No pilot air Check if there is pilot air.
Leakage of fluid at the
bottom of the air motor
Bellows damaged Check bellows; replace if necessary.
The pump does not deliver
enough pressure
Insufficient air pressure (valve
insufficiently open, air leak,…)
Check; adjust.
Insufficient air inlet on the
motor or outlet clogged
Check filter and mounting.
Hose not correct Replace hose.
Head piston seals worn Check mounting and replace seals.
The pump operates but
irregular flow
Air inlet in the suction circuit
Check mounting, state of the parts,
tightening of the parts and seals.
Replace if necessary.
Valves clogged on the seat,
incorrectly mounted or worn
Check the valves, clean them and
change them if necessary.
Muffler clogged up Clean or change.
Fluid leakage from pump
body
Wrong tightening of the
cylinder
Check the cylinder and the seals.
Replace parts if necessary.
Seals damaged, worn or
missing
The piston goes down
quickly (single effect
operation)
Wrong feeding of the pump
Check the use parameters of the
accessories suction rod pressure,…).
They can be not adapted or
clogged.
Suction valve worn
Check and replace the suction
valve.
A foreign product obstructs
the suction valve
Check and clean.
Piston seals or seals incorrecty
mounted or damaged
Check the mounting; change the
seals if necessary.
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