17
ENG
6.2 Oil change
Oil change should be done when the pump is still warm.
ATTENTION:
Use protective gloves to avoid injury caused by heat.
References:
EM4 - EM4/B
on page 20
EM8 - EM8/B
on page 21
EM12 - EM12/B
on page 24
EM20 - EM20/B
on page 25
EM28 - EM28/B
on page 26
EM40 - EM40/B
on page 27
Unscrew the oil filling plug (
E
) and the discharge plug (
G
) only after having placed
below the pump tank a suitable container (proper size and shape) for collecting the
total quantity of oil. Once the oil has been completely discharged from the tank, re-
assemble both plugs (“
E
” and “
G
”) and let the pump run under vacuum for about
one minute, so that the lubricating/cooling line get emptied and any oil residual
keeps inside the pump. Then, remove the plugs and discharge the rest of the oil.
If the oil is polluted or if some water is in the oil, clean the pump by letting it run
at maximum vacuum level with about 0.5 litre of fresh oil for at least 5 minutes.
Change again the lubricating oil. Fill the pump with fresh oil (please see “commis-
sioning” and “recommended oil table”).
Lubricating line cleaning (for EM 4- EM 4/B)
Dirty or blocked lubricating line (the fitting pos. 13 in particular) might be the reason
for the pump bad operation or performance decrease.
In order to clean the pipeline, please carry out the following operations:
• With reference to the exploded view on page 30, disassemble the tank (pos. 14)
by unscrewing its screws (pos. 20). Remove the end plate (pos. 8) by unscrewing its
screws (pos. 9).
• Using compressed air, clean the lubricating fitting (and its internal adapter) by
blowing in the opposite direction with respect to the normal oil flow, through the
passage hole which is in the internal flat side of the end plate pos. 8.
• Clean the inside of the tank carefully. Please make sure not to leave any residual.
• For assembly, proceed the reverse of above steps.
Oil recovery line cleaning (for EM4/B)
A dirty or blocked oil recovery line (orifice pos. 22 and filter pos. 21 particularly) is
the reason for oil accumulation in the exhaust filter seat and can be the reason for its
ejection during the pump operation.
In order to get the line cleaned, please follow the instructions:
• Taking the exploded view on page 30 as a reference, disassemble the tank (pos.
14) by unscrewing its screws (pos. 20). Remove the exhaust filter (pos. 19) and the
oil sight glass (pos. 16 and 16A) from the tank.
• Using compressed air, clean the parts (pos. 21 and 22) of the lubricating circuit,
by blowing the opposite direction with respect to the normal oil flow, through the
passage hole in the tank inside surface.
• Clean the tank inside and the exhaust filter seat carefully. Do not leave any re
-
sidual.
• For assembly, proceed the reverse of above steps.
6.3 Replacement of exhaust filter
Exhaust elements which are overly dirty may cause a considerable pump temperature
rise and the electric motor protection tripping. Maximum allowed pressure in the
tank is 0.5 bar measured at the maximum capacity (when the pump is working with
the inlet open to atmospheric pressure). If a pressure gauge has been fitted on the
tank, check the exhaust filter blockage with the pump warm. To replace the filter,
unscrew the exhaust filter by removing its screws. Unscrews the exhaust filter and
replace it. If needed, change the tank cover gasket, too.
EM4 - EM4/B
see exploded view on page 30
EM8 - EM8/B
see exploded view on page 32
EM12 - EM12/B
see exploded view on page 34
EM20 - EM20/B
see exploded view on page 36
EM28 - EM28/B
see exploded view on page 38
EM40 - EM40/B
see exploded view on page 40
For assembly, proceed the reverse of above steps and observe the max. tightening
torque of 15Nm.
