DROPSA Dragon Series Manuale d'uso e manutenzione - Pagina 8
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8. TROUBLESHOOTING
ATTENTION: The machine may only be opened and repaired by authorised Dropsa personnel.
A diagnostics table is provided below that indicates the main anomalies, the probable causes and the possible solutions.
If you were not able to solve the problem after consulting the diagnostics table, do not try to find the fault by disassembling
machine parts but contact the Dropsa technical office and report the anomalies that have been discovered, with a detailed
description.
PROBLEMS
The pump does not deliver oil
The pump does not deliver oil at
the required pressure
Line pressure not released
Emptying of the main system line
during the pause time
Lubrication cycle not performed
8
DIAGNOSTICS TABLE
PROBABLE CAUSES
It intakes air because the tank is empty
The intake filter is dirty or clogged
The internal fittings are loose or broken
The motor rotates backward
Pump deteriorated
Pressure control valve decalibrated
(therefore the oil returns immediately to
the tank).
Release valve damaged
Adjustment valve incorrectly calibrated
Presence of dirt in the by-pass valve
Control valve with irregular operation
Pump or system outlet fittings loosened
Non-return or release valve dirty
Cycle control pressure switch calibration
pressure not reached due to:
Line pipe broken or loose fittings
Pressure switch calibrated higher than
the pump
The pump does not deliver oil at the
required pressure
The pump does not deliver oil
ACTIONS
Restore the level in the tank and bleed the air
from the system
Wash the filter with petroleum and blow with
compressed air
Carefully close all the
fittings, making sure there are no leaks and
replace the broken pipes.
Correctly connect the motor, inverting the
direction of rotation
Replace the pump
Tighten the adjustment screw until oil comes out
of the delivery pipe
Replace the by-pass valve
Connect a pipe that is approx. 30 cm long to the
pump outlet with a pressure gauge applied to the
free end. Adjust the valve by turning the screw
and reading the corresponding pressure value on
the pressure gauge
Remove the components and wash them with
petroleum. Before reassembling the components,
check the wear status of the O-ring. Replace the
entire assembly if necessary
Disassemble and clean the by-pass valve, replace
the valve if necessary
Tighten the fittings
Disassemble and clean the by-pass valve, replace
the valve if necessary
Replace the pipe - fully tighten the fittings
Correctly calibrate the pressure switch
See the diagnostics table
See the diagnostics table