540
9
HYDRAULIC SYSTEMS
Studio ti 03312 540-04usa
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− Where the possibility of freezing exists, drain the pump body. Before
restarting the pump, refill it with water and follow the priming
sequence described in Priming A Pump.
− If the yacht will be inactive for a long period, drain and clean the pump
bodies and tanks.
− Check that the pump shaft turns freely. Use a suitable tool or a
screwdriver at the end of the motor shaft.
− Check to ensure that the rotation direction of the pump shaft is
correct, and that the pump motor does not draw more than its rated
amperage when operating.
− Check the impeller. If it is obstructed, the electric motor will be
seriously damaged. If the impeller is obstructed, remove the
obstruction, and clean the impeller and the pump body.
− If the impeller or the mechanical seals need replacement. This
requires the services of a skilled technician.
− Check the brushes and brush springs in DC motors at regular
intervals.
− To prevent damage to the motor, check that the turning attachment is
not blocked.
− Check the pressure inside the pump tank. This must be the same as
the connection pressure of the electric pump.
9.1.5 Priming a pump
When a pump has been drained or opened for inspection or service, it
should be primed before it is used. A newly installed pump also requires
priming.
− Fill the pump body with water to allow the pump to prime. This
operation is very important and must be carried out at the first start of
a new pump and at any time the pump body is drained. Priming the
pump helps avoid damaging the pump and the impeller.
− Turn ON the pump with the water inlet CLOSED and the discharge
outlet completely OPEN. Then slowly OPEN the water inlet to start the
water flow. If water does not flow, refill the pump body and repeat the
priming procedure.
NOTICES
Avoid voiding the manufacturer’s warranty. An electric pump should be
repaired only by an authorized and qualified technician, using approved
spare parts designed for the pump.
MAINTENANCE
Verify the operation of the pumps and of the floating switches at least
once a week.
At least once a month:
• verify the condition of the connections;
• carefully clean the pumps and the floating switches;
• carefully clean the bilges.
Verify any sign of obstruction in the pipes at least once every six
months.
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