Warning
If these safety instructions are not observed,
it may result in personal injury.
If these safety instructions are not observed,
it may result in malfunction or damage to the
equipment.
Notes or instructions that make the job easier
and ensure safe operation.
Page
10
12
12
13
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
2
nameplate are described in the table below.
2
2
3
4
2.1 Nameplate
5
5
2.1.1 Pump namepla te
5
6
6
6
7
8
8
9
Fig. 1 Pump nameplate
Pos.Description
1Pump type
2Pump model
3
4Enclosure class
5Maximum ambient temperature [°C] / [°F]
6Maximum system pressure [bar] / [psi] / [MPa]
7Maximum liquid temperature [°C] / [°F]
8Insulation class
9Motor protection
10Rated flow [m
11Head at rated flow [m] / [psi]
12Maximum head [m] / [psi]
2.1.2 Motor nameplat e
As codes can be combined, a code position may
contain more than one code (letter).
Environmental rating for enclosures based on NEMA
type designations
3
/h] / [GPM]
TM04 0355 0908
2
Fig. 2 Motor nameplate
Pos.Description
1Number of phases
2Voltage [V]
3Maximum current [A]
4Rated current [A]
5Power output [kW] / [hp]
Single-phase pumps only:
6
Capacitor size [F] and voltage [V]
TM04 0356 0908
2.2 Type key
Note
ExampleCM3 - 6 O - R - I - E - A VB 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 [m
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 sealMaterials in contact with pumped liquid E: EPDM (ethylene propylene)
I:SleeveEN 1.4301/AISI 304 Material of stationary seat
Screw, MG 71, MG 804M6 x 165 - 8
Staybolt, MG 904M5 x 220
181
Staybolt, MG 90L4M5 x 260
Staybolt, MG 1004M5 x 270
Staybolt, MG 1124M6 x 288
Silicone oil, 350 cSt,
food grade
2M4 x 82.7 - 3.34M5 x 123.5 - 4-
-Sapphire Aqua-SilO-ring, MG 90, MG 1001∅52 x 3.0
4.5 - 6
THREAD-EZE
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).
4
4. Service tools
ABCD
EFGH
IJKL
MN
English (GB)
4.1 Standard tools
Pos.DesignationFor pos.Further informationProduct number
AScrewdriver103, 156-SV0803
BCross-head screwdriver181Ph2 x 100SV0279
CTorx screwdriverJTX30 x 115 mmSV0335
DRing/open-end spanner
EHexagon key26
FPuller for bearing153, 154--
GPlastic hammer156-SV0349
HRatchet handle156-96777072
IHexagon head driver
JBits kit28g, 152, 181-SV2010
64c15 mm-
6713 mmSV0055
5 mm6 mmSV0196
26
181M5 - 4 mm-
M6 - 5 mmSV0296
M8 - 6 mmSV0297
4.2 Torque tools
Pos.DesignationFor pos.Further informationProduct number
KTorque screwdriverJ1-6 NmSV0438
LRing insert toolN13 mm - 9 x 12 mmSV0294
MRatchet insert toolI9 x 12 mm - 1/2"SV0295
NTorque wrenchL, M
9 x 12 mm - 4-20 NmSV2092
9 x 12 mm - 20-100 NmSV0269
5
5. Dismantling and assembly
Note
English (GB)
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).
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.
TM04 4327 1909
6
5.3 Assembling the pump
Note
Caution
Caution
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.
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.
Do not touch the seal face.
4. Fit rotating seal face (pos. 104) so that the seal face touches
the stationary seat (pos. 103).
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).
TM05 9050 3213
See fig. 7.
English (GB)
TM04 4326 1909TM02 1057 0501
Do not touch the seal face.
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
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.
TM04 4325 1909
7
5.4 MG 71 and MG 80 motors
English (GB)
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).
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 t he mo tor
1. Push bearing (pos. 154) on shaft (pos. 51).
2. Fit spring (pos. 158) and O-ring (pos. 159). See fig. 9.
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.
TM04 4441 1209
TM04 4441 1209
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.
8
5.6 Checking and replacing impellers and chamber s
CheckReplace
ImpellerWear 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.
• Check whether there is a visible and noticeable (use a finger
nail) edge on the rotating bearing ring.
Fig. 10 Correct fitting of wear ring
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
• Replace both bearing rings (pos. 47a) and chamber for bearing
(pos. 4a).
TM02 1182 0601
English (GB)
9
6. Fault finding
English (GB)
FaultCauseRemedy
1. The pump does not run.a) Supply failure.Switch on the switch.
2. Motor-protective circuit breaker has
tripped (trips out immediately when
supply is switched on).
3. The motor-protective circuit breaker
trips out occasionally.
4. The motor-protective circuit breaker
has not tripped out, but the pump is
inadvertently out of operation.
5. The pump performance is unstable.a) Pump inlet pressure is too low.Check the inlet conditions of the pump.
6. The pump performance is unstable
and the pump is noisy.
7. The pump runs, but gives no water.a) Pump inlet pressure is too low.See 5. a).
8. When startup is attempted, the pump
will start, but delivers no pressure or
flow.
Warnin g
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.
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.
a) Fuses are blown.See 1. b).
b) Contacts of the motor-protective circuit
breaker or magnet coil defective.
c) Cable connection is loose or faulty.Check cables and cable connections for
d) Motor winding is defective.Repair or replace the motor.
e) Pump is mechanically blocked.Switch off the power supply, and clean or
f) Setting of motor-protective circuit
breaker is too low.
a) Setting of motor-protective circuit
breaker is too low.
b) Periodic supply failure.See 2. c).
c) Periodically low voltage.Check cables and cable connections for
a) See 1. a), b), d) and 2. e).
b) Suction pipe is partly blocked by
impurities.
c) Leakage in suction pipe.Remove and repair the suction pipe.
d) Air in suction pipe or pump.Vent the suction pipe/pump.
Self-priming pumps only:
a) The differential pressure across the
pump is too low.
b) Suction pipe is partly clogged by
impurities.
c) The foot or non-return valve is stuck in
its closed position.
d) Leakage in suction pipe.See 5. c).
e) Air in suction pipe or pump.See 5. d).
Self-priming pumps only:
a) Liquid column above non-return valve in
discharge pipe prevents the pump from
self-priming.
b) Suction pipe draws in air.Make sure that the suction pipe is airtight from
Replace the contacts of the motor-protective
circuit breaker, the magnet coil or the entire
motor-protective circuit breaker.
defects, and replace the fuses.
repair the pump.
Set the motor-protective circuit breaker
according to the rated current of the motor
(I
). See nameplate.
1/1
See 2. f).
defects and loose connections.
Check that the supply cable of the pump is
correctly sized.
Remove and clean the suction pipe.
Check the inlet conditions of the pump.
Close the tap gradually until the discharge
pressure is stable and the noise has ceased.
See 5. b).
Remove and clean, repair or replace the valve.
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.
pump to liquid level. Repeat the startup
procedure described in the installation and
operating instructions.
10
FaultCauseRemedy
9. The pump runs, but does not deliver
the rated flow.
10. The pump runs backwards when
switched off.
11. The pump runs with reduced
performance.
Self-priming pumps only:
a) Internal valve does not close.Close the tap gradually until a sudden rise in
pressure or flow can be seen. Then open the
tap gradually until the required flow is reached.
a) Leakage in suction pipe.See 5. c).
b) Foot or non-return valve are defective.See 6. c).
c) Foot valve is stuck in completely or
partly open position.
a) Wrong direction of rotation.Three-phase pumps only:
a) See 5. a), b), c), d).
See 6. c).
Switch off the power supply with the external
circuit breaker, and interchange two phases in
the pump terminal box.
English (GB)
11
7. Drawings
4565
English (GB)
7.1 CM SP 1, 3, 5
Fig. 11 CM SP 1, 3, 5
12
TM05 8836 3413
8. Order of assembly for chambers and impellers
The tables below help to place chambers in the right order when assembling the pump.
Bombas GRUNDFOS de Argentina S.A.
Ruta Panamericana km. 37.500 Centro
Industrial Garin
1619 Garín Pcia. de B.A.
Phone: +54-3327 414 444
Telefax: +54-3327 45 3190
Australia
GRUNDFOS Pumps Pty. Ltd.
P.O. Box 2040
Regency Park
South Australia 5942
Phone: +61-8-8461-4611
Telefax: +61-8-8340 0155
GRUNDFOS Sarajevo
Zmaja od Bosne 7-7A,
BH-71000 Sarajevo
Phone: +387 33 592 480
Telefax: +387 33 590 465
www.ba.grundfos.com
e-mail: grundfos@bih.net.ba
Brazil
BOMBAS GRUNDFOS DO BRASIL
Av. Humberto de Alencar Castelo Branco,
630
CEP 09850 - 300
São Bernardo do Campo - SP
Phone: +55-11 4393 5533
Telefax: +55-11 4343 5015
Bulgaria
Grundfos Bulgaria EOOD
Slatina District
Iztochna Tangenta street no. 100
BG - 1592 Sofia
Tel. +359 2 49 22 200
Fax. +359 2 49 22 201
email: bulgaria@grundfos.bg