Maintenance And Inspection; Tightening Torques; Shaft Seal - Grundfos CR series Montage- Und Betriebsanleitung

10. Maintenance and inspection

Service documentation is available in Grundfos
Product Center (http://product-
selection.grundfos.com/).
If you have any questions, please contact the
nearest Grundfos company or service workshop.

10.1 Tightening torques

DANGER
Explosion risk
Death or serious personal injury
- The coupling screws, shaft seal, shaft
seal flange screws and shaft seal set
screws must be tightened according to
the specified torque values.
10.1.1 Coupling
Fig. 5 Coupling screws
Coupling screws (4 pcs)
Pump size
CR, CRI, CRN
1s, 1, 3
CR, CRI, CRN
10, 15, 20
CR, CRI, CRN
32, 45, 64, 90
CR, CRI, CRN
120, 150
CR, CRN 95,
125, 155, 185,
215, 255
14
Coupling screw
(4 pcs)
Tightening torque
M6 - 13 Nm
M8 - 31 Nm
M10 - 61 Nm
M6 - 13 Nm
M8 - 31 Nm
M10 - 62 Nm
M10 - 85 Nm
M10 - 85 Nm
M16 - 100 Nm
M10 - 85 Nm
M16 - 100 Nm

10.2 Shaft seal

CR, CRI, CRN 1s, 1, 3, 5, 10, 15, 20, 95, 125, 155,
185, 215, 255
Shaft seal
Fig. 6 Shaft seal and shaft seal set screws for
CR, CRI, CRN 1s, 1, 3, 5, 95, 125, 155,
185, 215, 255
Pump size
Shaft seal
CR, CRI, CRN
M28 - 35 Nm
1s, 1, 3, 5
CR, CRI, CRN
M33 - 35 Nm
10, 15, 20
CR, CRN 95,
Hex 60-100 Nm
125, 155, 185,
Hex 75-150 Nm
215, 255
CR, CRN 32, 45, 64, 90, 120, 150
Shaft seal flange screw (4 pcs)
Shaft seal set screw (3 pcs)
Fig. 7 Shaft seal flange screws and shaft seal
set screws for CR, CRN 32, 45, 64, 90,
120, 150
Pump size Shaft seal
flange screws
(4 pcs)
CR, CRI, CRN
32, 45, 64, 90
M10 - 62 Nm
CR, CRI, CRN
120, 150
Shaft seal set screw
(3 pcs)
Tightening torque
Shaft seal set
screws (3 pcs)
M5 - 2.5 Nm
M6 - 6 Nm
Tightening torque
Shaft seal set
screws (3 pcs)
M6 - 6 Nm