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Fig. 14: Checking the axial alignment with a
calliper gauge - circumferential check
Fig. 15: Set screw A for axial safeguard
B
Fig. 16: Fastening screws B of coupling
halves
7.5.3 Alignment of the pump unit
Installation and operating instructions Wilo-CronoNorm-NL, NLG
B
NOTE:
The axial deviation of the two coupling halves may be a max. of
0.1 mm in every state, i.e. even at the operating temperature and
when inlet pressure is applied.
• When correctly aligned, connect the coupling halves and mount the
coupling protection. The tightening torques of the coupling are listed
in Tab. 6.
Tightening torques for set screws and coupling halves
(see also Fig. 15 and Fig. 16 ):
Coupling
Tightening torque,
parameter d
[mm]
80, 88, 95, 103
110, 118
125, 135
140, 152
160, 172
180, 194
200, 218
225, 245
250, 272
280, 315
350, 380
400, 430
440, 472
Tab. 6: Tightening torque for set screws and coupling halves
All deviations in the measuring results indicate a misalignment. In this
case, the unit must be realigned to the motor.
• To do this, loosen the hexagon head bolts and the counter nuts on the
motor.
• Place shims under the motor feet until the height difference is com-
pensated. Pay attention to the axial alignment of the coupling.
• Tighten the hexagon head bolts again.
• Finally, check the function of the coupling and shaft. The coupling
and shaft must be easy to turn by hand.
• After correct alignment, mount the coupling protection.
Tightening torque,
set screw A
set screw B
[Nm]
[Nm]
4
4
8
17.5
8
15
25
25
67.5
25
70
145
70
185
130
200
130
340
230
410
English
13
14
29
35
44
86
72
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