POMPE CUCCHI MX Series, Руководство по эксплуатации и техническому обслуживанию, Страница: 32 / 75

Pompa ad Ingranaggi - Serie MX
Gear Pump - MX Series
32
2.3 STORAGE FOR LONG PERIOD
As far as motors are concerned, please consult the operating and maintenance instructions
of the Supllier.
Pumps must be stored indoors, in a clean, dry, moisture-free and vibration-less environ-
ment. Pump nozzles and other opening must be appropriately plugged and protected
against dust entrance. Pumps must be emptied from the process liquid, eventually washed
in case of aggressive fluids. Gears must be abundantly lubricated with glycerine oil (or other
lubricant fluids, compatible with the pump materials). At lubricating interval and monthly, spin
the pump shaft 2 turns, by hand. Before star-up, visually check for the pump unit integrity,
verify the pump shaft turns freely by hand and check that all bolts and screws are correctly
thightened.
3. DESCRIPTION OF THE PUMP AND THE PUMP UNIT
3.1 GENERAL DESCRIPTION OF THE MACHINE
Essentially the pump consists of two driven pinions which mesh one another inside an in-
vestment cast main body, thus creating a flow of liquid between the inlet and the outlet.
The fluid containment inside the pump is ensured by a suitable seal part as defined in the
order.
The pump is attached to the electric motor, EC approved, by flexible or magnetic coupling.
The access to the coupling and the projecting segments of motor-side and pump-side shafts
is prevented by a safety coupling guard.
The pump unit can be equipped with a mechanical speed reducer or an hydraulic speed
variator for the adjustment of the rotation speed, EC approved. The assembly rests on a
strong metal baseplate.
3.2 WARNINGS
Standard construction pumps, as an indication, require a NPSH of approx. 0.4 bar. Always
calculate the maximum available suction lift, in relation to fluid characteristics, suction circuit
and operating conditions. Ensure that gears do not operate when dry. Before starting the
pump for the first time or after long stationary periods, it is advisable to fill the gear spaces
with oil or liquid being pumped through one of the nozzles and rotate the driving shaft by op-
erating manually with a screwdriver on the motor cooling fan. This also makes it possible to
check for even and smooth movement of rotary components and excessive friction. It is rec-
ommended that an overland cut-out set at approx. 10% above the motor current be installed
in the control circuit.
In our pumps the direction of rotation is clearly shown by an arrow marking the right direc-
tion.
SUCTION
DELIVERY