Grundfos CR Service Instructions

English (GB)
7
8. CR, CRI, CRN 32, 45, 64, 90
8.1 Dismantling
1. Remove screws (pos. 7a) and coupling guards (pos. 7).
2. Remove screws (pos. 9) and coupling (pos. 8).
3. Attach the lifting device to eyebolts (pos. 28b).
4. Remove screws (pos. 28). Lift and remove the motor and
motor stool (pos. 1a).
5. Remove the flushing pipes.
6. Slacken socket screws (pos. 113) of the upper shaft seal
(pos. 105), and remove seal driver (pos. 112a).
7. Remove screws (pos. 58a).
8. Remove flushing chamber (pos. 77a).
9. Remove O-ring (pos. 109a).
10. Press stationary shaft seal ring (pos. 103) out of flushing
chamber (pos. 77a), and remove O-ring (pos. 102).
11. Remove lower seal driver (pos. 112) with rotating shaft seal
ring (pos. 104), upper seal driver (pos. 111), O-ring (pos. 107),
spring retainer (pos. 106) and spring (pos. 108).
12. Remove O-ring (pos. 110b).
13. Slacken socket screws (pos. 113) and remove lower shaft seal
(pos. 105b).
14. Continue dismantling according to the instructions of the
standard CR pump.
8.2 Assembly
1. Lubricate the shaft and fit lower shaft seal (pos. 105b).
2. Press the shaft home and tighten sockets screws (pos. 113) of
the lower shaft seal.
3. Lubricate and fit O-ring (pos. 110b) underneath lower seal
driver (pos.112).
4. Fit spring (pos. 108) and spring retainer (pos. 108) on the
lower seal driver.
5. Lubricate and fit O-ring (pos. 107) underneath upper seal
driver (pos. 111).
6. Fit the upper seal driver on the spring retainer.
7. Fit rotating seal ring (pos. 104) on the upper seal driver.
8. Lubricate and fit O-ring (pos. 102) into the stationary seal ring.
9. Fit the stationary seal ring into flushing chamber (pos. 77a).
10. Fit the lower seal driver into flushing chamber (pos. 77a);
make sure that the lower seal driver emerges from the top of
the chamber and that the lower and upper seal drivers
engage.
11. Fit seal driver ring (pos. 112a) on top of the chamber and on
the lower seal driver. Position it so that socket screws
(pos. 113) are aligned with the holes of the lower seal driver.
12. Tighten the socket screws slightly so that they fit into the
holes of the lower seal driver, but still leave room for the shaft
to slide.
Fig. 5 Fitting the upper shaft seal and flushing chamber
13. Fit the adjusting fork between the top of the flushing chamber
and the seal driver ring.
14. Lubricate and fit O-ring (pos. 109a) underneath flushing
chamber (pos. 77a).
15. Fit the flushing chamber on the shaft and press it home on the
pump head.
16. Fit and cross-tighten screws (pos. 58a).
17. Press the pump shaft home and tighten the socket screws
(pos. 113) of the upper shaft seal.
18. Attach the lifting device to the eyebolts. Carefully lift the motor
with the motor stool and fit it on upper pump head (pos. 2a).
Cross-tighten screws (pos. 28).
19. Fit coupling (pos. 8) and tighten screws (pos. 9). See fig. 6.
Fig. 6 Adjusting the coupling
20. Remove the adjusting fork and check that the pump can rotate
freely.
21. Fit coupling guards (pos. 7) and tighten screws (pos. 7a).
Caution
To prevent the motor from tipping over, hold it
straight when using a lifting device.
Note
Note that the shaft seal is spring-loaded.
Note
The extruded part of the spring retainer goes
against the spring.
Caution
Do not touch the seal faces with the fingers or
any greasy tool.
Make sure that the polished face of the rotating
seal ring faces upwards.
TM058746_2613
Caution
To prevent the motor from tipping over, hold it
straight when using a lifting device.
Note
Leave a gap of 2 mm between the bottom of the
coupling and the top of the flushing chamber.
TM03 9607 4207

Grundfos CR Specifications

General

Brand	Grundfos
Model	CR
Category	Water Pump
Language	English