MAINTENANCE
NA Series Operating & Instruction Manual
Page 24
Oil lubricated
It is very important to check the bearing operation, their temperature and the oil level.
Check bearing housing temperature: it can raise up to 50°C above the ambient temperature, but it
should never exceed 90°C.
For the first start-up it is recommended to replace the oil after 50 hours running.
Then every six months or after a long stop it is necessary to replace the oil.
Oil type
Prior to starting the pump the bearing housing should be filled with one of the following oils:
Use ISO VG-46 viscosity oil for bearing temperature from 0° to 70°C: AGIP OSO46 classification or
equivalent.
Use ISO VG-68 viscosity oil for bearing temperature 70° to 90°C: AGIP OSO 68 classification or
equivalent.
OIL QUANTITY :
BEARING BRACKET SIZE
24
0.4 lt.
Fill to the middle of the sight glass, using the following procedure:
v.
pour oil into the bearing housing, through the filler cap on top of it, until oil is just visible at
the bottom of the sight glass.
vi.
tip back the transparent bulb of the constant level oiler (if mounted), and fill it with oil.
vii.
allow the bulb to return to its normal position. Wait for the oil to flow into the bearing
housing.
viii.
repeat the operation until oil no longer flows out of the bulb.
Pump stop for long period
Before any stop it is necessary to :
Switch off the line.
Close suction and delivery gate valves.
Drain the pump through the hole on the lower side of the pump casing.
