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MXSUM 404/A
Инструкция по эксплуатации Страница: 7

CALPEDA MXSUM 404/A [7/24] Maintenance

When the liquid level on the suction side is

above the pump (inflow under positive suction

head, fig. 1B), fill the pump by opening the suction

gate valve slowly and completely, keeping the

delivery gate valve and the air vent (ref. 6, fig. 1)

open to release the air. Close the plug when the

water reaches the air vent hole.

With a three-phase power supply make sure

the direction of rotation is correct.

For this purpose, with the gate valve at any aperture

position, check the pressure (with the pressure

gauge), or flow rate (sight check) after starting.

Switch off power, invert the connections of two

phases on the control panel, re-start and check the

pressure or flow rate capacity again.

The correct direction of rotation will provide a con-

siderably greater and easily distinguishable pres-

sure and delivery capacity.

Check that the pump works within its field of perfor-

mance and that the absorbed current shown on the

name-plate is not exceeded. Otherwise adjust the

delivery gate valve or the setting of any pressure

switches.

If a priming loss occurs (interruption of delivery flow)

or if a pressure oscillation is indicated by the

pressure gauge, make sure all the suction pipe

couplings are perfectly sealed.

Never run the pump for more than

five minutes with a closed gate valve.

Prolonged operation without a change

of water in the pump causes dangerous

increases of temperature and pressure.

6. Maintenance

Under normal operating conditions the pump will

not require maintenance.

ATTENTION: if the pump is temporarily used

with dirty liquids or water containing chlori-

de, flush the pump briefly with clean water im-

mediately after use to remove any deposit.

If the pump has not been used for a long time and

does not start or gives no water (but electrical

connections are in order), the pump must be

removed and checked to see if it is choked by any

foreign matter or blocked by sediment, deposits or

any other cause.

When the pump remains inactive it must be

emptied completely if there is a risk of

freezing.

Disconnect electrical power before

any servicing operation and make

sure the pump cannot be accidentally

switched on.

7. Dismantling

7.1. Checking rotation of the shaft

Close the suction and delivery gate valves and

drain the pump casing before dismantling the

pump.

For dismantling and re-assembly see construction

in the cross section drawing.

While the pump is positioned horizontally, remove

the screws (14.24), the square nuts (14.28) the

base (61.00), the suction casing (16.00) with the

elbow (16.30)

. Hold the first stage casing (25.01)

tightly with one hand so that is does not rotate and,

with a wrench on the nut (28.04), turn the shaft in

the anti-clockwise direction.

If the shaft is blocked and cannot be freed, disman-

tling should continue until the cause has been found

and removed.

7.2. Inspection of the hydraulic parts

The O-ring (14.20) and then the complete motor

assembly with all internal pump parts are remo-

ved from the external jacket (14.02).

The first impeller can be inspected by removing

the first stage casing (25.01).

Once the nuts (28.04) and washer (28.08) are

removed the spacer sleeves (64.15), impellers

(28.00) and the other stage casings (25.02 and

25.05) can be dismantled one after the other.

Others parts should not be dismantled.

The motor and pump functions can be impaired

by erroneous procedure or tampering with in-

ternal parts.

7.3. Oil chamber

If the oil chamber has to be inspected, follow

these instructions:

CAUTION: there may be slight pressu-

re in the oil chamber.

Care must be taken to avoid a sudden spur-

ting of oil.

Wait until the oil chamber cover

(34.03) has cooled down.

Before removing the lower mechanical seal

(36.00), loosen the screws (70.18) and raise the

cover (34.03), applying force simultaneously on

two opposite points of the cover rim, to let off pres-

sure from the oil chamber. Carry out this operation

while holding the motor in the upturned vertical

position.

When refilling the chamber use only white oil suita-

ble for food machinery and pharmaceutic use

(quantity = 35 g).

First, mount the fixed parts of the seal (36.00) on

the oil chamber cover (34.00) and then the oil

chamber cover (34.03) on the motor cover (70.00)

with the O-ring (70.09).

8. Spare parts

When ordering spare parts, please quote their

designation, position number in the cross section

drawing and rated data from the pump name plate

(typ, date and serial number).

Changes reserved.

CALPEDA MXSUM 404/A [7/24] Maintenance

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