Maintenance
7.3.1
Returning the pump to the manufacturer
Pump unpressurized
Pump completely empty
Electrical connections isolated and motor secured against
switch-on
Pump cooled down
Auxiliary systems shut down, unpressurized and emptied
Manometer lines, manometer and fixtures dismounted
Enclose a truthful, and fully completed, safety certificate
when returning pumps or components to the manufacturer.
(→ 9.4 Declaration of harmlessness, Page 43).
Repair carried out
Measure for return
...at the customer’s
premises
Return the defective
component to the
manufacturer.
...at the
manufacturer’s
premises
Flush the pump and
decontaminate it if it was
used to pump hazardous
media.
Return the complete pump
(not disassembled) to the
manufacturer.
...at the
manufacturer’s
premises for
warranty repairs
Only in the event of
hazardous pumped media:
flush and decontaminate the
pump.
Return the complete pump
(not disassembled) to the
manufacturer.
Tab. 10
Measures for return
7.3.2
Preparations for dismounting
Pump unpressurized
Pump completely empty, flushed and decontaminated
Electrical connections isolated and motor secured against
switch-on
Pump cooled down
Auxiliary systems shut down, depressurized and emptied
Manometer lines, manometer and fixtures dismounted
Safety guarding removed
In production, the pumps are constructed to a standard
process. The slide-in unit can be removed without remov-
ing the volute casing and piping.
1. When dismounting, observe the following:
–
Mark the precise orientation and position of all compo-
nents before dismounting.
–
Dismantle components concentrically without canting.
2. Dismount the pump (→ sectional drawing).
7.3.3
Removal of the flanged motor
WARNING
Risk of injury due to overturning motor!
Secure the motor to prevent overturning before working on
the stub shaft.
4
A
B
C
5
Fig. 10
Widening the stub shaft
A Version for stub shaft, hole diameter up to 55 mm
B Version for stub shaft, hole diameter up to
55 mm and clamping ring
C Version for stub shaft, hole diameter starting from 60 mm
1
Cheese head screw
2
Stub shaft
3
Shaft key groove of the motor shaft
4
Clamping ring
5
Key (from stub shaft bore hole diameter 60 mm)
1. Remove one half of the guard sheet (686.01) from the
motor bell housing (341.01).
The Allen key required to undo the cheese head screw
(914.06) is inserted in one of the two cast-in recesses in
the motor bell housing.
2. Undo the cheese head screw (914.06) on the stub shaft
(220.xx) and unscrew it completely (→ 9.1 Sectional draw-
ings, Page 30).
24
NI series
BA-2021.06 en-US
550 113 – 146-900/E
