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Version with mechanical seal
Version with stuffing box packing
Fig. 32: Example for a straight cut
Installation and operating instructions Wilo-CronoNorm-NL, NLG
For version with the mechanical seal, see Fig. 26:
• Insert a new O-ring (5.12) in the cleaned mechanical seal cover (5.4).
• Insert the stationary part of the mechanical seal (5.11) into the
cleaned mechanical seal cover (5.4).
• Push the mechanical seal cover (5.4) onto the shaft (3.1).
• Push the rotating part of the mechanical seal (5.11) onto the shaft.
• Push the fixing ring (5.3) onto the shaft and mount under the obser-
vation of the installation dimension H1 and the tightening torque
(see Fig. 31 and Tab. 9).
Fig. 31: Version with mechanical seal
Pump type/size
NLG 150/200
NLG 200/260
NLG 200/315
NLG 200/400
NLG 200/450
NLG 250/315
NLG 250/355
NLG 250/400
NLG 300/400
Tab. 9: Tightening torque
• Screw the housing cover 4.1 (drilled rinsing hole in the cover, aligned
downward) to the bearing bracket (9) with hexagon head bolts (13).
• Screw the mechanical seal cover (5.4) to the housing cover (4.1) with
hexagon head bolts (5.5).
See Fig. 26:
• Push the spacer ring (5.2) onto the shaft.
Version with stuffing box packing:
CAUTION! Risk of damage to property!
Danger of damage to the pump due to improper handling.
• Make sure that the tight fit is reached on the stuffing box housing
and not on the sleeve.
• Check the surface of the shaft sleeve (see Fig. 27, item 5.12); many
score marks are an indication that it must be replaced. Before install-
ing, thoroughly clean all stuffing box parts.
If the packing is delivered in the form of a cord, this must be cut off.
• For this purpose, wind the packing helically around the shaft sleeve or
around a clamping chuck of the same diameter.
Installation
Tightening torque
dimension H1
[mm]
12
69
16.5
9
9
69.5
12
72
72
English
[Nm]
2.5
88
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