Grundfos CR Series User Manual

21
English (US)
13.2.2 CR 1s, 1, 3, and 5
1. Insert shaft pin into shaft hole.
2. Mount the coupling halves onto shaft and shaft pin.
3. Fit the coupling screws and leave loose. Check that the gaps
on either side of the coupling are even and that the motor
shaft keyway is centered in the coupling half as shown in
fig. 16.
4. Tighten the screws to the correct torque. See section
13.2.1 Torque specifications.
13.2.3 CR 10, 15 and 20
1. Insert shaft pin into shaft hole.
2. Insert plastic shaft seal spacer beneath shaft seal collar.
3. Mount the coupling halves onto shaft and shaft pin.
4. Fit the coupling screws and leave loose. Check that the gaps
on either side of the coupling are even and that the motor
shaft keyway is centered in the coupling half as shown in
fig. 16.
5. Tighten the screws to the correct torque. See section
13.2.1 Torque specifications.
6. Remove plastic shaft seal spacer and hang it on inside of
coupling guard.
Fig. 16 Coupling adjustment all CR, CRI, CRN, CRT
13.2.4 CRT 2, 4, 8 and 16
1. Mount coupling halves. Make sure the shaft pin is located in
the pump shaft.
2. Put the cap screws loosely back into the coupling halves.
3. Using a large screwdriver, raise the pump shaft by placing the
tip of the screwdriver under the coupling and carefully raising
the coupling to its highest point. See fig. 17.
Fig. 17 Coupling adjustment CRT 2, 4, 8, and 16
4. Now lower the shaft halfway back the distance you just raised
it and tighten the coupling screws (finger tight) while keeping
the coupling gap equal on both sides. When the screws are
tight enough to keep the coupling in place, then cross-tighten
the screws.
• Note the clearance below the coupling.
• Raise the coupling as far as it will go.
• Lower it halfway back down (1/2 the distance you just
raised it).
• Tighten screws (see torque specifications).
Fig. 18 Coupling adjustment clearance CRT 2, 4, 8, and 16
TM04 3919 3613
CORRECT
Keyway
Keyway
Gap between
coupling halves
CORRECT
NOT CORRECT
TOP View
TM02 1051 2713
Note
Note
The shaft can only be raised approximately
0.20 inches (5 mm).
TM02 1051 0501
M6 - 13 Nm
M8 - 31 Nm
M10 - 62 Nm
0.5x
x

Grundfos CR Series Specifications

General

Type	Centrifugal pump
Material	Stainless steel
Motor range	0.37 kW to 22 kW
Applications	Water supply
Impeller Material	Stainless steel
Connections	Flanged
Speed	2900 rpm
Temperature range	-20°C to +120°C (depending on model and material)