Preparation; Refilling Of Motor Liquid; Positional Requirements - Grundfos SQ Series Installation And Operating Instructions Manual

5. Preparation

Grundfos MS 3 and MSE 3 submersible motors have
water-lubricated slide bearings. No additional
lubrication is required.
The submersible motors are factory-filled with a
special Grundfos motor liquid (type SML 3), which is
frost-proof down to -20 °C and preserved to prevent
the growth of bacteria.
The level of motor liquid is decisive for the operating
life of the bearings and consequently the life of the
motor.

5.1 Refilling of motor liquid

If for any reason the motor liquid has been drained or
lost, the motor must be refilled with Grundfos motor
liquid SML 3.
To refill the motor, proceed as follows:
1. Remove the cable guard and separate the pump
part from the motor.
Refilling of motor liquid
2. Place the motor in vertical position with an
inclination of approx. 10 °.
3. Remove the filling plug using a screwdriver or a
similar tool.
4. Inject motor liquid into the motor with a filling
syringe or the like.
5. To allow possible air to escape, move the motor
from side to side.
6. Refit the filling plug and make sure it is tight.
7. Assemble pump part and motor.
8. Refit the cable guard.
The pump is now ready for installation.

5.2 Positional requirements

The pump is suitable for vertical as well as horizontal
installation, however, the pump shaft must never fall
below the horizontal plane. See fig. Positional
requirements of the pump.
Positional requirements of the pump
Pos. Description
1 Allowed
2 Not allowed
If the pump is to be installed horizontally, e.g. in a
tank, and there is a risk that the pump might be
covered by mud, it must be fitted in a flow sleeve.
For installation depths, see section Installation
depths.
Related information
7.8.2 Installation depths
1
2
9