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

Liquid
temperature,
max. 86°F
Fig. 1 Pump installed in well

2.5 Motor preparation

Grundfos MS 3 and MSE 3 submersible motors have
water-lubricated slide bearings. No additional lubri-
cation is required.
The submersible motors are factory-filled with a spe-
cial Grundfos motor liquid, type SML 2 or SML 3,
which will protect the motor liquid down to 4°F
(–20°C) and prevent the growth of bacteria. The
level of motor liquid is important for the operating life
of the bearings and consequently the life of the
motor.

2.6 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 2 or SML 3.
To refill the motor, proceed as follows:
1. Remove the cable guard and separate the pump
end from the motor.
2. Place the motor in vertical position with an incli-
nation of approximately 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 similar tool, see fig. 2.
5. To allow possible air to escape, move the motor
from side to side and turn the shaft.
6. Replace the filling plug and make sure it is tight.
7. Assemble pump end and motor.
8. Fit the cable guard.
The pump is now ready for installation.
Well
diameter
Pump
diameter

3. Installation positions

3.1 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. 3.
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 installed in a flow sleeve.
10
Fig. 2 Injecting motor liquid
Allowed
Fig. 3 Pump position
Not allowed
5