For this purpose the smaller pumps have a
screwdriver notch on the ventilation side of the
shaft end.
Check that the direction of rotation
is
as shown by the arrow on the pump casing,
otherwise disconnect electrical power and re-
verse the connections of two phases.
Switch on the pump with the delivery gate valve
closed.
Slowly open the discharge valve to obtain the
required pump duty point within the field of
performance shown on the name-plate.
Check that the pump works within its field of
performance, 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.
7. Maintenance
The mechanical seal does not require any
maintenance.
When the pump is not used, empty it comple-
tely if freezing may be expected (fig. 4).
Before restarting the unit, check that the shaft is
not jammed and fill the pump casing completely
with liquid.
Disconnect electrical power
before any servicing operation.
(Only adjustment of the stuffing box,
section
7.,
and
lubrication
procedure, section 8., may be performed, with
caution, while motor is running).
8. Pumps with packing seal
First loosen the gland slightly so that the seal is
decompressed. Then adjust the gland, leaving a
regular leakage-drip, which indicates proper lu-
brification.
The packed gland must be replaced when its
sealing properties have considerably decrea-
sed. A compressed, hardened and dry packing
causes the shaft to wear.
9. Bearings lubrication
Up to frame size 160 the motors have prelubri-
cated bearings and they do not require any re-
lubrication.
From frame size 180 the motors have grease
nipples. A relubrication at regular intervals
(about 5000 h) is recommended only in heavy
working conditions, with high ambient tempera-
tures. An excess of grease is harmful. Use
lithium base grease for high temperatures.
10. Dismantling
Close the suction and delivery gate valves and
drain the pump casing before dismantling the
pump.
For dismantling and re-assembly see construc-
tion in the cross section drawing.
With the feet under the pump casing (back pull-
out design), by removing the nuts (14.28) the
motor can be removed complete with impeller,
without removing the pump casing and pipe-
work.
11. Spare parts
When ordering spare parts, please quote data
stamped on the name-plate and the position
number of each spare part required in accor-
dance with the cross section drawing.
Use bearings with C3 clearance and grease for
high temperatures.
Any
pumps
that
require
in-
spec-tion/repair
must be drai-
ned and carefully cleaned insi-
de and out-side before dispat-
ch/submission.
12.Disposal
Observe the local regulations and codes in force
regarding sorted waste disposal.
Changes reserved.
Fig. 4 Draining.
8
4.93.142
IST_NM libro05_2013:IST_GX 01_06 30/04/13 16.37 Pagina 8
