14
TROUBLESHOOTING
TROUBLES
CAUSES
CURES
The pump doesn’t
reach the required
pressure
Valves have worn seats
Suction hose with air pockets
or irregular elbows
Worn nozzles
Clogged strainer
Check valves
Check hose
Check nozzles
Clean strainer
The pressure
gauge fluctuates
Pump is sucking air, or air
hasn’t been evacuated
completely.
Valves blocked
Start pump with the gun open,
to evacuate the air
and commutate.
Clean or change valves
The liquid flow
is irregular
The air in the pulsation damper
is incorrectly set.
Check pressure in pulsation
damper. Should be 8-10% of
operating pressure.
Output drops and
the pump is noisy
Oil level is too low
Top up with oil to correct level
(halfway of the site glass),
when pump is operating.
Oil comes out of
the discharge pipe
One or more diaphragms are
broken. Stop pump immedi-
ately
Drain the pump of oil. Disman-
tle heads and change dia-
phragms. Fill with oil to correct
level.
Oil is changing col-
or into white
Diaphragm failure (s). Stop
pump immediately
Drain the pump of oil. Disman-
tle heads and change dia-
phragms. Fill with oil to correct
level.