13
193552102 - v.1 - UPD 300817
PROBLEM
Pump cannot be started
Pump stops working under load
Pump operates but no pressurized oil is
delivered
Pump fails to reach maximum pressure
Pump delivers pressurized oil but load
is not lifted
Piston retracts although treadle is not
pressed on RELEASE side
Piston fails to perform retract stroke (sin-
gle acting cylinder)
Piston fails to perform retract stroke
(double acting cylinder)
Pump
fl
ow rate insuf
fi
cient
POSSIBLE CAUSE
Compressed air line closed or clogged
Insuf
fi
cient air pressure
Air
fi
lter dirty or clogged
Oil leak in the main hydraulic circuit
Pump internal leak
Low oil level
Insuf
fi
cient air pressure
Internal relief valve incorrectly set
Oil leak in the main hydraulic circuit
Excess load
Oil circulation fault
Oil leak in the main hydraulic circuit
Pump internal fault
Oil pressure line obstructed or coupling
incorrectly connected
If piston is designed to return under gravity,
ensure load is suf
fi
cient.
Cylinder spring broken
Cylinder release valve not working
Oil pressure line obstructed or coupling
incorrectly connected
Cylinder release valve not working
Insuf
fi
cient air pressure
Air
fi
lter dirty or clogged
Reservoir breather screw not opened
CORRECTIVE ACTION
Check compressed air supply to pump
Check compressed air supply to pump is
between 2.8 and 10 bar
Clean or renew
Check the circuit for leaks and repair as
necessary
Check for leaks and return pump to ma-
nufacturer for repair
Check level and top up as necessary
Check compressed air supply to pump is
between 2.8 and 10 bar
Contact the manufacturer
Check the circuit for leaks and repair as
necessary
Reduce
Check if pipelines are obstructed or if
cylinder is working correctly
Check the circuit for leaks and repair as
necessary
Check for leaks and ask the manufac-
turer
Check oil pressure line
Increase load on cylinder
Repair
Repair cylinder
Check oil pressure line
Repair cylinder
Check compressed air supply to pump is
between 2.8 and 10 bar
Clean or renew
Open breather crew as described in
chapter 5
8 - SCRAPPING AND DISPOSING OF THE PUMP
If the pump is no longer required for duty, empty the oil and dispose of it in accordance with the law of your country.
The same procedure must be followed for other parts of the pump, in observance of the type of material (plastics or metal).
7.5 - Troubleshooting
The following chart describes the main problems that could occur during operation of the pump, together with an indication of the ap-
propriate corrective action. If the prescribed action fails to solve the problem, contact the manufacturer.
Summary of Contents for Z12101
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