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

Dismantling Procedures CR, CRN 32•45•64•90

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.

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.

Remove the 8 mm socket Allen Screws

(Pos. 58a) from the Seal Retainer (Pos.

58). Remove the retainer.

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

Dismantling Procedures CR, CRN 32•45•64•90

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

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.

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

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.

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).

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

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.

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).

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

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.

Use an 8 mm Allen wrench to loosen and remove the Retainer Screw (Pos. 58d). Then,

remove the Connecting Pipe Retainer (Pos. 58c).

Use 00SV2128 and a rubber mallet to

drive out the Retainer Ring (Pos. 47h)

and Bushings (Pos. 47g).

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.

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

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.

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, the

3 mm Set Screws (Pos. 113) from

the Tandem Shaft Seal (Pos. 105c).

39 40

Loosen and remove the

8 mm hex socket Allen Screws

(Pos. 58b) holding the seal housing.

Use two  at / slot blade screwdrivers

to pry the seal loose. Lift the seal (Pos.

105c) completely off of the shaft

(Pos. 51).

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).

Loosen, but do not remove, the

3 mm Set Screws (Pos. 113)

from the Shaft Seal (Pos. 105).

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

Cartridge Seals

Will lift out as a complete assembly.

Loosen and remove the 24 mm

Staybolt Nuts (Pos. 36) and Washers

(Pos. 66a).

Dismantling Procedures CR, CRN 32•45•64•90

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.

Loosen the chamber straps,

remove 6 mm hex socket Allen

Screw (Pos. 26b), Washer (Pos. 26c),

and Chamber Straps (Pos. 26a).

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).

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).

Dismantling Procedures CR, CRN 32•45•64•90

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.

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).

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.

Punch

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