Troubles And Cures - Bertolini GIARDINAGGIO Serie Manual De Uso Y Mantenimiento

5. TROUBLES AND CURES

CAUTION! Only skilled technicians are authorised to carry out special
maintenance
Troubles
The pump fails to prime
The pump doesn't
reach the required
pressure
The pressure gauge
fluctuates
The liquid flow is
irregular
The pump is noisy
Output drops and the
pump is noisy
Oil comes out of the
delivery side
Oil is changing its color
into white
Oil comes out from the
oil seal of the shaft
Probable Cause
 Air sucked
 Pressure adjusting valve in the
"Press" position
 Valves have worn seats
 Suction hose with air pockets or
irregular elbows
 Worn nozzles or with wrong
diameter
 Clogged strainer
 R.P.M. too slow
 Pump is sucking air, or air
hasn't been evacuated
completely
 The pulsation dampener is flat
 One or more valves blocked
 Oil level is too low
 One or more diaphragms are
broken
 Diaphragms failures
 Damaged or worn oil seal
 Too much oil into the crankcase
Cures
 Check the suction circuit
 Set the regulating valve in the "by-
pass" position.
 Check valves
 Check hose
 check nozzle (see "PUMP
SELECTION" section)
 Clean strainer
 Make sure that the pump RPM
correspond to the value indicated on
the label
 Start the pump with the gun open to
evacuate the air
 Inflate the pulsation dampener
 Clean or change valves
 Top up with oil to correct level
(halfway of the sump),when pumps is
operating
 Replace the diaphragms as indicated
in the section "HOW TO REPLACE
THE DIAPHRAGMS AND PUMP OIL"
 Replace the diaphragms as indicated
in the section "HOW TO REPLACE
THE DIAPHRAGMS AND PUMP OIL"
 Replace the oil seal
 Check the oil level and reset the
correct one
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