DROPSA 37002 Manual do utilizador e de manutenção - Página 5
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8. TROUBLESHOOTING
DIAGNOSTIC TABLE
INDICATION
The pump does not deliver oil or does not
deliver oil in the exact quantity prescribed
The pump does not deliver oil at the prescribed
pressure
PROBABLE CAUSE
Drawing in air due to the tank
being empty
The splash filter is dirty or
blocked
The connections are loose
Pump has deteriorated
Pressure regulating valve loose,
so the oil returns immediately to
the tank before flowing through
the delivery valve
Release valve damaged
Incorrect setting of the
regulating valve
Presence of dirt under the by-
pass valve
REMEDY
Refill the tank and purge air
from the system
Wash the filter and blow it
through with compressed air
Set all connections ensuring
there are no leakages
Replace the pump
Set the regulating screw until oil
exits from the delivery
Replace the valve
To the pump outlet connect a
tube approximately 30cm long
with a manometer connected to
the free end. Regulate the valve
by means of turning the screw
and reading the corresponding
pressure value on the
manometer
Disassemble the valve and clean
or replace it as necessary
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