Grundfos MGE 100, Instructions Manual

English (GB)

4

2. General information

These service instructions apply to MGE and MLE model J.

Position numbers of parts (digits) refer to drawings and parts lists; 
position numbers of tools (letters) refer to section 

5. Service 

tools

.

Electrical parts must only be serviced by Grundfos or an 
authorised service workshop.

Before dismantling

• Close the isolating valves, if fitted, and make sure that they 

cannot be accidentally opened.

• Before starting work on the product, let the product and 

pumped liquid cool off.

During assembly

• Lubricate and tighten screws and nuts according to sections 

3. Torques

 and 

4. Secondary materials

.

After assembly

• If analog or digital inputs, the relay output or the CIM module 

has been removed from the functional module, check the 
communication with external units after service. See section 

7.15 Configuring the controller

.

3. Torques

* Screws of new terminal boxes must be tightened to 7-8 Nm.

Torques for terminals

4. Secondary materials

The installation and operating instructions for this 
product and for the system which it is part of must be 
available during service of the product.

WARNING
Biological hazard

Death or serious personal injury
- Use personal protective equipment if there is a risk 

of getting into contact with the pumped liquid.

- Observe local regulations.

WARNING
Electric shock

Death or serious personal injury
- Switch off the power supply and make sure that it 

cannot be accidentally switched on. The power 
supply must be switched off for at least five 
minutes before you start working on the motor.

- Check that other pumps or sources do not force 

flow through the pump even if the pump is 
stopped. This will cause the motor to act like a 
generator, resulting in voltage on the terminals.

Pos.

Designation

Type

Dimensions

[mm]

Torque

[Nm]

152

Torx screw

Tx25

12 x M5

3.5 - 4

178

Tx30

16/10 x 60

5-6*

181

Tx27

185

Tx30

16 x M6

5-6

192

Tx30

14 x 6

5-6*

206

Tx30

M8

5-6

208

Tx40

M5

4

251d

Tx25

50 x M5

5-6*

268

Tx25

12 x M5

3.5 - 4

273a

Tx20

32 x M4

1 - 1.3

277a

Tx20

32 x M4

1 - 1.3

286

Tx40

21 x M7

2.2 - 2.7

288a

Tx20

M4

1 - 1.3

289a

Tx30

14 x 6

5-6

291

Union

M20

M20 x 1.5

1 - 1.3

Terminal

Thread

Max. torque

[Nm]

L1, L2, L3, L, N

M4

1.8

NC, C1, C2, NO

M2.5

0.5

1-26, A, Y, B

M2

0.5

Pos.

Designation

Quantity

[kg]

Product 

number

156c,d

Castrol LMX grease

0.1

00RM4311

159d,e

153, 154 Mobil Unirex N3 grease

0.1

96747301

156a,b

SKF anti-fretting agent 
LGAF 3E

0.1

96530559

156a,b

150

Loctite 5512

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