Grundfos CM SP Operating instructions

CM SP
Self-priming
Service instructions
GRUNDFOS INSTRUCTIONS

English (GB)
2
English (GB) Service instructions
Original service instructions.
CONTENTS
Page
1. Symbols used in this document
2. Identification
This section shows the nameplate, the type key and the codes
that can appear in the variant code.
The pump and motor nameplates are positioned on the motor fan
cover or terminal box. The data and information on the pump
nameplate are described in the table below.
2.1 Nameplate
2.1.1 Pump nameplate
Fig. 1 Pump nameplate
2.1.2 Motor nameplate
Fig. 2 Motor nameplate
1. Symbols used in this document 2
2. Identification 2
2.1 Nameplate 2
2.2 Type key 3
3. Tightening torques and lubricants 4
4. Service tools 5
4.1 Standard tools 5
4.2 Torque tools 5
5. Dismantling and assembly 6
5.1 General information 6
5.2 Dismantling the pump 6
5.3 Assembling the pump 7
5.4 MG 71 and MG 80 motors 8
5.5 MG 90, MG 100, MG 112 and MG 132 motors 8
5.6 Checking and replacing impellers and chambers 9
6. Fault finding 10
7. Drawings 12
7.1 CM SP 1, 3, 5 12
8. Order of assembly for chambers and impellers 13
Warning
If these safety instructions are not observed,
it may result in personal injury.
Caution
If these safety instructions are not observed,
it may result in malfunction or damage to the
equipment.
Note
Notes or instructions that make the job easier
and ensure safe operation.
Note
As codes can be combined, a code position may
contain more than one code (letter).
TM04 0355 0908
Pos. Description
1 Pump type
2 Pump model
3Environmental rating for enclosures based on NEMA
type designations
4 Enclosure class
5 Maximum ambient temperature [°C] / [°F]
6 Maximum system pressure [bar] / [psi] / [MPa]
7 Maximum liquid temperature [°C] / [°F]
8 Insulation class
9 Motor protection
10 Rated flow [m3/h] / [GPM]
11 Head at rated flow [m] / [psi]
12 Maximum head [m] / [psi]
TM04 0356 0908
Pos. Description
1 Number of phases
2 Voltage [V]
3 Maximum current [A]
4 Rated current [A]
5 Power output [kW] / [hp]
6Single-phase pumps only:
Capacitor size [F] and voltage [V]
Model
IP T
Type P
max
T
liq,max
bar MPa PSI
Q nom
H nom
H max
m³/h GPM
Env
m
m
PSI
PSI
Q nom
H
nom
H max
m³/h GPM
m
m
PSI
PSI
°C °F
50 Hz
95120839
60 Hz
3455
6
77
89
10 10
11 11
12 12
66
1
10
11
12
10
11
12
2
Amb
°C °F
Insulation class
Imax
~/V
/A
/A
uF / V
kW
95120836
I1/1
P2
Imax
~/V
/A
/A
I1/1
P2
Capacitor
HP kW HP
uF / V
Capacitor
50 Hz 60 Hz
112
3
4
5
2
3
4
5
2
3
4
5
2
3
4
5
6 6

English (GB)
3
2.2 Type key
Note: Other supply voltages, shaft seal combinations and pipe connections are available on request.
Stainless steel EN 1.4401/AISI 316 is also available on request.
Example CM 3 - 6 O - R - I - E - A V B E C - A - A - N
Type range Sensor
CM: Centrifugal Modular N: No sensor
Rated flow rate Mains plug
Rated flow rate at 50 Hz [m3/h] A: Prepared for cable glands
Number of impellers Motor information
Pump version A: Standard motor (IP55)
O: Self-priming version (max. suction lift, 8 metres) Supply voltage
S: Self-priming version (max. suction lift, 4 metres) A: 1 x 220 V, 60 Hz
Pipe connection C: 1 x 220-240 V, 50 Hz
R: Whitworth thread, Rp (ISO 7/1) Material of secondary seal
Materials in contact with pumped liquid E: EPDM (ethylene propylene)
I: Sleeve EN 1.4301/AISI 304 Material of stationary seat
Pump shaft EN 1.4301/AISI 304 B: Carbon, resin-impregnated
Impellers/chambers EN 1.4301/AISI 304 Q: Silicon carbide (SiC)
Rubber parts in pump (excluding neck ring and shaft seal) Material of rotating seal face
E: EPDM (ethylene propylene) Q: Silicon carbide (SiC)
V: Aluminium oxide (AI203)
Shaft seal
A: O-ring seal with fixed driver
Note
The type key cannot be used for ordering, as not all combinations are possible.

English (GB)
4
3. Tightening torques and lubricants
THREAD-EZE, product number 00SV9997 (0.5 l).
Rocol Sapphire Aqua-Sil, product number 00RM2924 (0.5 kg).
Castrol LMX grease, product number 00RM4311.
Silicone oil, 350 cSt, food grade 00SV0862 (1 l).
Pos. Designation Quantity Dimensions Torque [Nm] Lubricant
5c O-ring 1 ∅37 x 2.62 Sapphire Aqua-Sil
11 O-ring 2 ∅18.5 x 2.0 - -
25 Plug 2 - 10 - 12 -
26 Staybolt, CM 1, 3, 5, stainless steel 4 M8 12 - 14 THREAD-EZE
28g Screw 4 M6 x 14 8 - 10 THREAD-EZE
31 O-ring, CM 1, 3, 5 1 ∅114.0 x 3.90 - Sapphire Aqua-Sil
64f Rubber seal 1 Sapphire Aqua-Sil
67 Locking nut 1 M8 16 - 18 -
102 O-ring 1 ∅17.86 x 2.62 - V7140084
103 Seal faces 1 - - Silicone oil, 350 cSt,
food grade
107 O-ring 1 ∅11.5 x 3.18 - Sapphire Aqua-Sil
152 Screw 2 M4 x 8 2.7 - 3.3 -
4 M5 x 12 3.5 - 4 -
155 Bearing cover plate 1 - - Sapphire Aqua-Sil
157a
Gasket, MG 71, MG 80 1 ∅114.8 / 121.2 x 0.25 - -
Gasket, MG 90 2 ∅141.2 / 145.5 - -
Gasket, MG 100 - - - -
158a O-ring 1 ∅35.4 x 1.97 - Sapphire Aqua-Sil
159
O-ring, MG 71, MG 80 1 ∅32 x 2
- Sapphire Aqua-SilO-ring, MG 90, MG 100 1 ∅52 x 3.0
O-ring, MG 112, MG 132 1 ∅62 x 3.0
159a Seal ring 1 - - Castrol LMX grease
181
Screw, MG 71, MG 80 4 M6 x 16 5 - 8
THREAD-EZE
Staybolt, MG 90 4 M5 x 220
4.5 - 6
Staybolt, MG 90L 4 M5 x 260
Staybolt, MG 100 4 M5 x 270
Staybolt, MG 112 4 M6 x 288

English (GB)
5
4. Service tools
4.1 Standard tools
4.2 Torque tools
ABCD
EFGH
IJKL
MN
Pos. Designation For pos. Further information Product number
AScrewdriver 103, 156 - SV0803
BCross-head screwdriver 181 Ph2 x 100 SV0279
CTorx screwdriver JTX30 x 115 mm SV0335
DRing/open-end spanner 64c 15 mm -
67 13 mm SV0055
EHexagon key 26 5 mm -
6 mm SV0196
FPuller for bearing 153, 154 - -
GPlastic hammer 156 - SV0349
HRatchet handle 156 - 96777072
IHexagon head driver 26 M6 - 5 mm SV0296
M8 - 6 mm SV0297
181 M5 - 4 mm -
JBits kit 28g, 152, 181 - SV2010
Pos. Designation For pos. Further information Product number
KTorque screwdriver J1-6 Nm SV0438
LRing insert tool N13 mm - 9 x 12 mm SV0294
MRatchet insert tool I9 x 12 mm - 1/2" SV0295
NTorque wrench L, M9 x 12 mm - 4-20 Nm SV2092
9 x 12 mm - 20-100 Nm SV0269

English (GB)
6
5. Dismantling and assembly
5.1 General information
If it is necessary to dismantle the pump, either because it is
choked or damaged, please follow the instructions in the following
sections.
Position numbers of parts (digits) refer to section 7. Drawings;
position numbers of tools (letters) refer to section 4. Service
tools.
Before dismantling the pump
• Disconnect the power supply to the motor.
• Close the isolating valves, if fitted, to avoid draining the
system.
• Remove the electric cable in accordance with local
regulations.
Before assembling the pump
• Clean and check all parts.
• Replace defective parts by new parts.
• Order the necessary service kits.
• Gaskets and O-rings should always be replaced when the
pump is overhauled.
During assembly
Lubricate and tighten screws and nuts to correct torque.
See section 3. Tightening torques and lubricants.
5.2 Dismantling the pump
1. Remove staybolts (pos. 26).
2. Remove clamping flange (pos. 6a) and sleeve (pos. 16).
3. Remove O-ring (pos. 5c) and water trap (pos. 5b).
4. Remove the two empty chambers (pos. 4f).
5. Remove valve chamber (pos 4e).
6. Remove spring valve (pos. 5e and 5d) from valve chamber
(pos. 4e).
7. Remove spring (pos. 5e) from base (pos. 5d).
8. Hold clamp (pos. 64c), and remove nut (pos. 67) by using
both tools D.
9. Remove lock washers (pos. 66) and clamp (pos. 64c).
10. Remove impeller (pos. 49).
11. Remove chambers (pos. 4).
12. Remove spacing pipe (pos. 64).
13. Continue the dismantling until short spacing pipe (pos. 64a),
rubber seal retainer (pos. 64g) and rubber seal (pos. 64f), and
remove those components.
14. Remove impeller (pos. 49), air separator chamber (pos 4d)
and spacing pipe (pos. 64).
15. Remove shaft seal (pos. 105). See fig. 3.
Fig. 3 Exploded view of shaft seal
16. Remove O-ring (pos. 31) and cover plate (pos. 32).
TM04 4327 1909
Note
Dismantling of MG 71 and MG 80, see section
5.4.1 Dismantling the motor.
Dismantling of MG 90 and MG 100, see section
5.5.1 Dismantling the motor.

English (GB)
7
5.3 Assembling the pump
1. Fit cover plate (pos. 32) and O-ring (pos. 31). Lubricate the
O-ring. See section 3. Tightening torques and lubricants.
2. Fit O-ring (pos. 102) on stationary seat. See fig. 4.
Lubricate the O-ring. See section 3. Tightening torques and
lubricants.
Fig. 4 Fitting the O-ring on the stationary seat
3. Press stationary seat (pos. 103) home.
4. Fit rotating seal face (pos. 104) so that the seal face touches
the stationary seat (pos. 103).
5. Fit O-ring (pos. 107) in rotating seal face (pos. 104).
Lubricate the O-ring. See section 3. Tightening torques and
lubricants.
6. Fit retainer (pos. 111) and stop ring (pos. 111a). See fig. 5.
Fig. 5 Fitting stop ring
7. Fit spring (pos. 108) and driver (pos. 112). See fig. 6.
Fig. 6 Fitting spring and driver
8. Fit air separator chamber (pos. 4d), spacing pipe (pos. 64)
and impeller (pos. 49).
9. Fit rubber seal (pos. 64f) in rubber seal retainer (pos. 64g)
and impeller (pos. 49), and slide it on the shaft.
10. Fit short spacing pipe (pos. 64a).
11. Fit remaining spacing pipes (pos. 64), chambers (pos. 4) and
impellers (pos. 49).
12. Fit clamp (pos. 64c), lock washers (pos. 66) and nut (pos. 67).
See fig. 7.
Fig. 7 Correct fitting of lock washers
13. Hold clamp (pos. 64c), and tighten nut (pos. 67). See section
3. Tightening torques and lubricants.
14. Fit spring (pos. 5e) in base (pos. 5d).
15. Fit spring valve (pos. 5e and 5d) on valve chamber (pos. 4e).
16. Fit valve chamber (pos. 4e).
17. Fit the two empty chambers (pos. 4f).
18. Fit water trap (pos. 5b) and O-ring (pos. 5c).
19. Fit sleeve (pos. 16) and clamping flange (pos. 6a).
20. Fit and cross-tighten staybolts (pos. 26). See section
3. Tightening torques and lubricants.
Note
Assembly of MG 71 and MG 80, see section
5.4.2 Assembling the motor.
Assembly of MG 90 and MG 100, see section
5.5.2 Assembling the motor.
TM05 9050 3213
Caution
Do not touch the seal face.
Caution
Do not touch the seal face.
TM04 4325 1909
TM04 4326 1909TM02 1057 0501

English (GB)
8
5.4 MG 71 and MG 80 motors
Dismantle the pump before dismantling the motor. See section
5.2 Dismantling the pump.
5.4.1 Dismantling the motor
1. Remove screws (pos. 152).
2. Remove fan cover (pos. 151).
3. Remove fan (pos. 156) and seal ring (pos. 159a).
4. Remove screws (pos. 181).
5. Remove motor flange (pos. 156b) and gasket (pos. 157a).
6. Remove diverting disc (pos. 79), O-ring (pos. 158a) and
bearing cover plate (pos. 155).
7. Pull shaft (pos. 51) out of stator housing (pos. 150).
8. Pull bearing (pos. 153) off shaft (pos. 51).
9. Remove O-ring (pos. 159) and spring (pos. 158).
10. Pull bearing (pos. 154) off shaft (pos. 51).
5.4.2 Assembling the motor
1. Push bearing (pos. 154) on shaft (pos. 51).
2. Fit spring (pos. 158) and O-ring (pos. 159). See fig. 8.
Fig. 8 Correct fitting of spring and O-ring
3. Push bearing (pos. 153) on shaft (pos. 51).
4. Fit shaft (pos. 51) in stator housing (pos. 150).
5. Fit bearing cover plate (pos. 155), O-ring (pos. 158a) and
diverting disc (pos. 79). Lubricate the surface of the cover
plate (pos. 155) turning against the bearing. Lubricate O-ring
(pos. 158a).
For correct lubricant, see section 3. Tightening torques and
lubricants.
6. Fit gasket (pos. 157a) and motor flange (pos. 156b).
7. Fit and cross-tighten screws (pos. 181). See section
3. Tightening torques and lubricants.
8. Fit and lubricate seal ring (pos. 159a).
For correct lubricant, see section 3. Tightening torques and
lubricants.
9. Fit fan (pos. 156).
10. Fit fan cover (pos. 151).
11. Fit and tighten screws (pos. 152). See section 3. Tightening
torques and lubricants.
5.5 MG 90, MG 100, MG 112 and MG 132 motors
Dismantle the pump before dismantling the motor. See section
5.2 Dismantling the pump.
5.5.1 Dismantling the motor
1. Remove screws (pos. 152).
2. Remove fan cover (pos. 151).
3. Remove fan (pos. 156) and seal ring (pos. 159a).
4. Remove staybolts (pos. 181).
5. Remove motor flange (pos. 156b), gasket (pos. 157a) and
bearing cover (pos. 156a).
6. Remove diverting disc (pos. 79), O-ring (pos. 158a) and
bearing cover plate (pos. 155).
7. Pull shaft (pos. 51) out of stator housing (pos. 150).
8. Pull bearing (pos. 153) off shaft (pos. 51).
9. Remove O-ring (pos. 159) and spring (pos. 158).
10. Pull bearing (pos. 154) off shaft (pos. 51).
5.5.2 Assembling the motor
1. Push bearing (pos. 154) on shaft (pos. 51).
2. Fit spring (pos. 158) and O-ring (pos. 159). See fig. 9.
Fig. 9 Correct fitting of spring and O-ring
3. Push bearing (pos. 153) on shaft (pos. 51).
4. Fit shaft (pos. 51) in stator housing (pos. 150).
5. Fit bearing cover plate (pos. 155), O-ring (pos. 158a) and
diverting disc (pos. 79). Lubricate the surface of the cover
plate (pos. 155) turning against the bearing. Lubricate O-ring
(pos. 158a).
For correct lubricant, see section 3. Tightening torques and
lubricants.
6. Fit bearing cover (pos. 156a), gasket (pos. 157a) and motor
flange (pos. 156b).
7. Fit and cross-tighten staybolts (pos. 181). See section
3. Tightening torques and lubricants.
8. Fit and lubricate seal ring (pos. 159a). For correct lubricant,
see section 3. Tightening torques and lubricants.
9. Fit fan (pos. 156).
10. Fit fan cover (pos. 151).
11. Fit and tighten screws (pos. 152). See section 3. Tightening
torques and lubricants.
12. Only cast iron pumps: Fit discharge part (pos. 2).
13. Only cast iron pumps: Fit and tighten screws (pos. 2b).
See section 3. Tightening torques and lubricants.
TM04 4441 1209
TM04 4441 1209

English (GB)
9
5.6 Checking and replacing impellers and chambers
Fig. 10 Correct fitting of wear ring
Check Replace
Impeller Wear ring/wear ring retainer
• Check whether it is necessary to replace the impeller due to
friction between wear ring and impeller skirt. If wear has caused
a noticeable (use a finger nail) groove in the impeller skirt, the
impeller should be replaced.
It is advisable always to replace wear rings (pos. 45) and wear
ring retainers (pos. 65) when the chamber stack is dismantled.
1. Press wear ring retainer (pos. 65) up and free of the chamber
using a screwdriver.
2. Remove wear ring (pos. 45).
3. Fit a new wear ring in the chamber. See fig. 10.
4. Press a new wear ring retainer on the wear ring and in the
chamber.
It must be possible to move the wear ring freely (sideways) between
the retainer and the chamber.
Bearing ring
• Check whether there is a visible and noticeable (use a finger
nail) edge on the rotating bearing ring.
• Replace both bearing rings (pos. 47a) and chamber for bearing
(pos. 4a).
TM02 1182 0601

English (GB)
10
6. Fault finding
Warning
Before removing the terminal box cover, make sure that the power supply has been switched off. Make sure that it
cannot be accidentally switched on.
The pumped liquid may be scalding hot and under high pressure. Before any removal or dismantling of the pump,
the system must therefore be drained, or the isolating valves on either side of the pump must be closed.
Fault Cause Remedy
1. The pump does not run. a) Supply failure. Switch on the switch.
Check cables and cable connections for
defects and loose connections.
b) Fuses are blown. Check cables and cable connections for
defects, and replace the fuses.
c) Motor protection tripped. See 2. a), b), c), d), e), f).
d) Control-current circuit defective. Repair or replace the control-current circuit.
2. Motor-protective circuit breaker has
tripped (trips out immediately when
supply is switched on).
a) Fuses are blown. See 1. b).
b) Contacts of the motor-protective circuit
breaker or magnet coil defective.
Replace the contacts of the motor-protective
circuit breaker, the magnet coil or the entire
motor-protective circuit breaker.
c) Cable connection is loose or faulty. Check cables and cable connections for
defects, and replace the fuses.
d) Motor winding is defective. Repair or replace the motor.
e) Pump is mechanically blocked. Switch off the power supply, and clean or
repair the pump.
f) Setting of motor-protective circuit
breaker is too low.
Set the motor-protective circuit breaker
according to the rated current of the motor
(I1/1). See nameplate.
3. The motor-protective circuit breaker
trips out occasionally.
a) Setting of motor-protective circuit
breaker is too low. See 2. f).
b) Periodic supply failure. See 2. c).
c) Periodically low voltage. Check cables and cable connections for
defects and loose connections.
Check that the supply cable of the pump is
correctly sized.
4. The motor-protective circuit breaker
has not tripped out, but the pump is
inadvertently out of operation.
a) See 1. a), b), d) and 2. e).
5. The pump performance is unstable. a) Pump inlet pressure is too low. Check the inlet conditions of the pump.
b) Suction pipe is partly blocked by
impurities. Remove and clean the suction pipe.
c) Leakage in suction pipe. Remove and repair the suction pipe.
d) Air in suction pipe or pump. Vent the suction pipe/pump.
Check the inlet conditions of the pump.
6. The pump performance is unstable
and the pump is noisy. Self-priming pumps only:
a) The differential pressure across the
pump is too low.
Close the tap gradually until the discharge
pressure is stable and the noise has ceased.
7. The pump runs, but gives no water. a) Pump inlet pressure is too low. See 5. a).
b) Suction pipe is partly clogged by
impurities. See 5. b).
c) The foot or non-return valve is stuck in
its closed position. Remove and clean, repair or replace the valve.
d) Leakage in suction pipe. See 5. c).
e) Air in suction pipe or pump. See 5. d).
8. When startup is attempted, the pump
will start, but delivers no pressure or
flow.
Self-priming pumps only:
a) Liquid column above non-return valve in
discharge pipe prevents the pump from
self-priming.
Empty the discharge pipe. Make sure that the
non-return valve does not hold back liquid in
the discharge pipe. Repeat the startup
procedure described in the installation and
operating instructions.
b) Suction pipe draws in air. Make sure that the suction pipe is airtight from
pump to liquid level. Repeat the startup
procedure described in the installation and
operating instructions.