Grundfos CR 32 User manual

TORQUES
Position
Number
7a Screw for Guard .......................................... 6 ft.-lbs./8 Nm
9 Coupling Screws ..................................... 63 ft.-lbs./85 Nm
26b Allen Screw for Strap ............................ 11 ft.-lbs./15 Nm
28 Allen Screw Motor
Stool to Pump Head .............................. 46 ft.-lbs./62 Nm
28a Allen Screw for Motor
1/2" x 13 UNC, 3-40 HP ........................ 30 ft.-lbs./40 Nm
5/8" x 11 UNC, 50-60 HP ...................... 59 ft.-lbs./80 Nm
31 Allen Screw for Bottom
Stationary Bearing ...................................... 6 ft.-lbs./8 Nm
36 Staybolt Nut ..........................................74 ft.-lbs./100 Nm
48 Split Cone Nut ......................................... 52 ft.-lbs./70 Nm
58a &
58d Allen Screw Seal Carrier ....................... 46 ft.-lbs./62 Nm
67 Allen Screw for Shaft Bearing............. 23 ft.-lbs./31 Nm
113 Allen Set Screw for Shaft Seal ................. 6 ft.-lbs./8 Nm
CONTENTS
Dismantling Procedures ...................................................Page 2
When Should A Part Be Replaced ? ...............................Page 12
Reassembly Procedures ................................................. Page 13
Setting The Coupling Height ..........................................Page 21
Order of Stage Assembly - CR, CRN 32 ........................Page 23
Order of Stage Assembly - CR, CRN 45 ........................Page 24
Order of Stage Assembly - CR, CRN 64 ........................Page 25
Order of Stage Assembly - CR, CRN 90 ........................Page 26
CR, CRN 32•45•64•90
Dismantling &
Reassembly
GRUNDFOS
CR SERVICE MANUAL

4
2
Dismantling Procedures CR, CRN 32•45•64•90
1
2 3
Use an Allen wrench with an 8 mm tip
to loosen and remove the Coupling
Screws (Pos. 9) from the Coupling
Halves (Pos. 10a).
To remove the coupling halves, insert
a at/slot blade screwdriver in the
coupling gap and twist to free the rst
coupling half.
Loosen, but do not remove,
Coupling Guard Screws (Pos. 7a).
Remove Coupling Guards (Pos. 7)
from the Motor Stool (Pos. 1a).
In the instructions below, the numbers in parenthesis (7) indicate the position number of that part as it is shown on the Parts List and Kits diagram.
To free/remove the remaining cou-
pling half, strike the upper edge of the
coupling half with a rubber mallet.
Note: If you have multiple pumps,
do not interchange coupling
components, they are a matched set.
7
Loosen, but do not remove, the
3 mm Set Screws (Pos. 113)
from the Shaft Seal (Pos. 105).
These instructions cover the
repair of the pump after it has
been isolated from the system.
Before removing the pump from
the system, make sure all valves
are closed. Relieve any built-up
pressure by opening the vent plug
screw. The power source should be
turned off and locked out before
starting any work. Removal of
eld wiring to the motor may be
required. Color coding or numbering
the wires will aid in reinstallation.
For shaft seal change only
on a Standard unit or a Cool Top®,
follow steps 1 to 8.
Pumps built with Back-to-Back seals,
follow steps 1 to 11.
Pumps built with Tandem/Quench
seals, follow steps 35 to 49.
5
Remove the 8 mm socket Allen Screws
(Pos. 58a) from the Seal Retainer (Pos.
58). Remove the retainer.
6
Remove the Motor-to-Pump Bolts (Pos.
28a). Lift the motor off the pump.
Motor removal is not necessary. Skip
to step 6.
15 HP and UP
3 - 10 HP

3
Dismantling Procedures CR, CRN 32•45•64•90
11
Loosen and remove the 24 mm
Staybolt Nuts (Pos.36) and Washers
(Pos. 66a). For Standard pumps, skip
to dismantling step 50. For Cool Top
units, continue with steps 12 to 20.
For Back-to-Back units, continue with
steps 21 to 34.
Pos. 105
9
Cartridge Seals
Will lift out as a complete assembly.
Loosen and remove the 8 mm hex socket
Allen Screws (Pos. 28) connecting the
motor stool to Pump Head (Pos. 2).
To remove the Motor Stool (Pos. 1a):
Loosen the allen screws connecting the
motor stool to the pump head. Leave the
motor stool attached to the motor and/or
bearing ange to protect the motor shaft
and bearing ange shaft.
10
8
Use two at/slot blade screwdrivers
to pry the seal loose. Lift the seal
(Pos. 105) completely off of the shaft
(Pos. 51). For seal change only on
Standard and Cool Top pumps, go to
the Reassembly section step 47. For
STACK® (Pos. 80) replacement, Back-
to-Back Inboard Seal (Pos. 105b) and
Cool Top Connecting Pipe (Pos. 149)
removal, continue with step 10.
15 HP and UP
3 - 10 HP

Dismantling Procedures CR, CRN 32•45•64•90
4
14
To remove the upper sleeve, diagonally
grip the Staybolts (Pos. 26). Using
your thumbs, press against the
sleeve to release the sleeve from the
middle pump head. If it does not move
freely, light blows with a rubber mallet
might be required. Once loose, lift the
sleeve off.
Cool-Top®
Remove the upper most Pump Head
(Pos. 2b), Upper Sleeve (Pos. 55a)
and middle Pump Head (Pos. 2c) as a
complete assembly if it has not leaked,
then skip to step 16. If the assembly
has leaked follow steps 13 to 15.
Remove the upper most pump head.
This may require light upward blows
with rubber mallet to the underside
of the pump head.
13
12
17
Loosen and
remove the
8 mm hex socket
Retainer Screws
(Pos. 58d).
Remove
the Connecting
Pipe Retainer
(Pos. 58c).
Lift off the middle pump head. Lift off the Spacing ring (Pos. 116).
16
15
Remove the O-rings (Pos. 109a
and 109b). For reassembly of the
connecting pipe go to the Reassembly
section step 18. To continue
disassembly, proceed to step 50.
Remove the Connecting Pipe (Pos.
149).
Place the connecting pipe into one
of the pump heads. Use 00SV2128
and a rubber mallet to drive out the
Retainer Ring (Pos. 47h) and Bushings
(Pos. 47g).
18 19 20

Dismantling Procedures CR, CRN 32•45•64•90
23
To remove the
Inboard Shaft
Seal (Pos. 105b)
loosen, but do
not remove, the
two 3mm
Set screws
(Pos. 113a) in
the Seal Driver
( Pos. 112). Lift
the seal driver
off of the shaft.
Back-to-Back Seal
Remove the upper most Pump Head
(Pos. 2b). This may require light
upward blows with rubber mallet to
the underside of the pump head.
To remove the Upper Sleeve (Pos.
55a), diagonally grip the Staybolts
(Pos. 26). Use your thumbs to press
against the sleeve to release the sleeve
from the middle pump head. If it does
not move freely, light blows with
a rubber mallet might be required.
Once loose, lift the sleeve off.
22
21
Remove the Spring (Pos. 108b), Spring/O-ring Cup (Pos. 106b), O-ring (Pos. 107b), Seal Driver (Pos. 111b), and Rotating Seal Face (Pos. 104b).
24
Remove the Retaining Washer (Pos.
59a).
Remove the lower most Pump Head
(Pos. 2), Spacing Ring (Pos. 116) and
middle Pump Head (Pos. 2c) with
Connecting Pipe (Pos. 149) as an
assembly. Light upward blows with
rubber mallet to the underside of
the lower most pump head might be
required.
25 26 27
5
Use specialty
tool, 00SV7902,
to loosen and
remove the
threaded Seal
Retainer
(Pos. 148).

Remove the connecting pipe.
Dismantling Procedures CR, CRN 32•45•64•90
Back-to-Back Seal (continued)
Use your finger to reach through
the center of the seal, then pull the
Stationary Seal from the connecting
pipe.
Remove the middle pump head and spacing ring.
29
28
Use an 8 mm Allen wrench to loosen and remove the Retainer Screw (Pos. 58d). Then,
remove the Connecting Pipe Retainer (Pos. 58c).
30
6
Use 00SV2128 and a rubber mallet to
drive out the Retainer Ring (Pos. 47h)
and Bushings (Pos. 47g).
31
Flip the pump head over and remove
the four Stack Compression Spacers
(Pos. 60). For reassembly of the
inboard seal, skip to the Reassembly
Section step 25. To continue
disassembly, proceed to dismantling
step 51.
32
Remove the O-rings (Pos. 109a and
109b).
33 34

To free/remove the remaining
coupling half, strike the upper edge
of the coupling half with a rubber
mallet. Note: If you have multiple
pumps, do not interchange coupling
components, they are a matched set.
Dismantling Procedures CR, CRN 32•45•64•90
37
Use an Allen wrench with
an 8 mm tip to loosen and
remove the Coupling Screws (Pos. 9)
from the Coupling Halves (Pos. 10a).
Tandem Seal
Loosen the top
Coupling Guard
Screw (Pos. 7a),
but do not fully
remove. Loosen
and fully remove
the lower screw.
Tilt and slide
the Coupling
Guards (Pos. 7)
off of the system
flush piping.
Remove system  ush piping.
36
35
To remove the coupling halves, insert
a  at/slot blade screwdriver in the
coupling gap and twist to free the
 rst coupling half.
38
Loosen, but do not remove, the
3 mm Set Screws (Pos. 113) from
the Tandem Shaft Seal (Pos. 105c).
41
39 40
7
Loosen and remove the
8 mm hex socket Allen Screws
(Pos. 58b) holding the seal housing.
42
Use two  at / slot blade screwdrivers
to pry the seal loose. Lift the seal (Pos.
105c) completely off of the shaft
(Pos. 51).
43
Regardless of the motor HP size
on Tandem Seal equipped pumps,
the motor must be removed to
change the seals. Remove the
motor to pump bolts (Pos. 28a). Lift
motor off of motor stool (Pos. 1a).

Loosen and remove the 8 mm
hex socket Allen Screws (Pos. 28)
connecting the motor stool to Pump
Head (Pos. 2).
Dismantling Procedures CR, CRN 32•45•64•90
Tandem Seal (continued)
Remove the Tandem Seal Housing
O-ring (Pos. 109c).
44
48
8
45
Loosen, but do not remove, the
3 mm Set Screws (Pos. 113)
from the Shaft Seal (Pos. 105).
46
Use two at/slot blade screwdrivers
to pry the seal loose. Lift the seal
completely off the shaft. For seal
change only, go to the Reassembly
section, step 47. To continue
disassembly, proceed to step 48.
Pos. 105
47
Cartridge Seals
Will lift out as a complete assembly.
49
Loosen and remove the 24 mm
Staybolt Nuts (Pos. 36) and Washers
(Pos. 66a).

Dismantling Procedures CR, CRN 32•45•64•90
50
Remove Pump Head (Pos. 2) (this may
require light tapping with a rubber
mallet to the underside of the pump
head to loosen). Once pump head is
loose, lift off of pump.
51 To remove Outer
Sleeve (Pos. 55),
grip staybolts
diagonally. Using
your thumbs,
press against
sleeve to release
the sleeve
from the pump
housing. Lift off
sleeve.
Lift the impeller STACK® (Pos. 80) off
the suction/discharge base (Pos. 6).
For Stack Replacement instructions,
go to Reassembly Section, step
15. To continue disassembly,
proceed with steps 54 to 66.
52
Loosen the chamber straps,
remove 6 mm hex socket Allen
Screw (Pos. 26b), Washer (Pos. 26c),
and Chamber Straps (Pos. 26a).
54
53
Fit assembly/disassembly tool
(00SV0003) to Stack. The tool consists
of different size spacing plates. Select
the plate which ts securely to the
Stack Interface (Pos. 44). Place holding
pin into the disassembly hole.
Remove the Upper Chamber (Pos. 3).
55
Loosen Split Cone Nut (Pos. 48) approximately two to three full turns with split cone
nut wrench (00SV0004). Flip tool over and give a sharp blow directly down against the
split cone nut. This will loosen the Split Cone (Pos. 49b) and allow the Impeller (Pos.
49a) to be lifted off the shaft. Lift off Chambers (Pos. 4 & 4a). Repeat this process until
all impellers are removed from Shaft (Pos. 51).
56 57
Remove Base Interface (Pos. 44).
9

Dismantling Procedures CR, CRN 32•45•64•90
58
To remove the shaft from the
assembly/disassembly tool, remove
the holding pin from the shaft and
lift shaft out of tool.
After inspecting the parts, if further
disassembly is required, proceed to
the next steps.
59
Remove bearing from shaft. Remove
6 mm hex socket Allen Screw (Pos. 67),
locking washers (Pos. 66b), washer
(Pos. 66), and journal bearing (Pos. 47b).
Loosening the allen screw may require
use of the holding pin as a countering
device so the shaft does not spin.
Depending on wear, the Neck Ring (Pos. 45),
Retainer (Pos. 65), and Holder (Pos. 45a)
may need to be removed. Using a at bar,
pry these components out of the chambers
and base interface as a complete assembly.
If wear or damage is minor, the neck
ring may be replaced using a screw-
driver to twist and pry out the retainer.
Lift out the Neck Ring (Pos. 45).
60
To remove the Chamber
Bearing (Pos. 47), Bearing Sleeve
(Pos. 47c), and Bearing Lock Ring
(Pos. 47d), place chamber upward
using the punch (00SV0015).
Drive the bearing downward.
61 62
If the Impeller Wear Ring (Pos. 49c) is
worn and the split cone nut/impeller
hub threads are not damaged, the
wear ring may be removed using
the appropriate support tool,
• CR, CRN32 00SV0043
• CR, CRN45 00SV0044
• CR, CRN64 00SV0045
• CR, CRN90 00SV0046
along with the wear ring puller
(00SV0239) used to pry off the wear
ring. If the threads of the impeller hub are
damaged, a new impeller will be required.
10
Punch