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7.5
Aligning the unit
7.5.1 General
7.5.2 Check the coupling alignment
Fig. 11: Checking the radial alignment with
a comparator
Fig. 12: Checking the radial alignment with
a ruler
Fig. 13: Checking the axial alignment with a
calliper gauge
71
CAUTION! Danger of property and material damage!
Improper handling can lead to property and material damage.
• The alignment must be checked before the first start. The trans-
port and installation of the pump can affect the alignment. The
motor must be aligned to the pump (and not vice versa).
• The pump and motor are usually aligned at ambient temperature.
They may have to be readjusted so that the thermally related
expansion at the operating temperature is taken into account.If
the pump has to pump very hot fluids, proceed as follows:
Allow the pump to run at the actual operating temperature. Switch
off pump, then immediately check the alignment.
Precondition for reliable, smooth and efficient operation of a pump
unit is proper alignment of the pump and the drive shaft. Misalign-
ments can be the cause of:
• excessive noise development during pump operation
• vibrations
• premature bearing wear
• excessive coupling wear
Check the radial alignment:
• Firmly clamp a dial gauge to one of the couplings or to the shaft
(see Fig. 11). The piston of the dial gauge must lie against the crown
of the other half-coupling (see Fig. 11).
• Set the dial gauge to zero.
• Turn the coupling and write down the measuring result after every
quarter turn.
• Alternatively, the radial coupling alignment can also be checked with
a ruler (see Fig. 12).
NOTE:
The radial deviation of the two coupling halves may be a max. of
0.15 mm in every state, i.e. even at the operating temperature and
when inlet pressure is applied.
Check the axial alignment:
Using a calliper gauge, circumferentially check the distance between
the two coupling halves (see Fig. 13 and Fig. 14).
WILO SE 07/2013
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