Grundfos VersaFlo UPS, Installation And Operating Instructions Manual

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6. Replacing components
6.1 Removing the pump head
1. Disconnect or TURN OFF the power supply.
2. Close any isolation valves on either side of the
pump to avoid draining the system of liquid.
3. Disconnect the electrical leads from the terminal
box.
4. Disconnect and remove the conduit from the
terminal box.
5. Loosen and remove the four allen-head screws
(8 or 10 mm) which connect the pump head
housing to the pump housing.
6. Remove the pump head from the pump housing.
7. Clean the machined surfaces in the pump
housing of any foreign material.
Fig. 21 Removing and fitting the pump head
6.2 Fitting the pump head
1. Carefully remove the new pump head assembly
from its packaging. Separate the impeller/rotor
assembly from the new pump head.
2. While holding the thrust bearing, carefully place
the impeller/rotor assembly into the pump hous-
ing. The bearing plate should fit snugly into the
lowest machined surface in the pump housing.
3. Make sure that the impeller/rotor assembly can
rotate freely.
4. Place the O-ring over the rotor and locate it into
the inner diameter of the pump housing.
5. Carefully place the pump head housing over the
rotor and rotate it so the terminal box is in the
position you wish, see section
3.1 under
"Terminal box position".
6. Make sure the pump head housing is properly
seated on the pump housing.
Do not force the two together - if there is bind-
ing, disassemble them and repeat steps 2 to 6.
Tighten the allen-head screws evenly to secure
the pump head.
Torque to:
8 mm............15 ft lb
10 mm..........25 ft lb.
7. Check to make sure the motor shaft turns freely,
as explained in section 3.1 under "Rotating the
terminal box".
TM
03
72
92
47
06
Pump housing
Thrust bearing
Grooves
O-ring
Pump head housing
Allen-head
screws (4)
Terminal box
Impeller/rotor
assembly
Bearing plate