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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