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453345 ISS S 07.2010
16.
Fit the impeller (item 4). Remember to use the proper tightening
torque:
M10:
33 ft-lb
(45 Nm)
M14:
52 ft-lb
(70 Nm)
M20:
148 ft-lb
(200 Nm)
17.
Check that the locating pin (item 8), where fitted, in the top of the
back plate mates with the detent in the pump body and carefully, to
avoid damaging the O-ring, press the pump body (item 1a) in over
the O-ring (item 6) and fasten with the clamp ring (item 9a) or body
screws, observing the correct tightening torque.
M8:
22 ft-lb
(30 Nm)
M10:
41 ft-lb
(55 Nm)
M12:
80 ft-lb
(59 Nm)
5.3 Replacement of motor
The standard motor for the W+ pump has a locked front bearing. If the
motor is replaced, the new motor must also have a locked front bea ring.
The motor bearing is enclosed and permanently lubricated.
Follow the instructions below when replacing the motor. For replace ment
of bearings, see the motor supplier's service instructions.
1.
Lock Out power supply then disconnect the pump and motor
from system.
2.
Removal of the pump body. See para 5.2, points 1-4.
3.
Remove the impeller.
4.
If possible, stand the pump on end. See Fig. 4.
5.
Undo the four motor flange bolts between the motor and extension
frame and remove them. See Fig. 4.
6.
Lift the back plate, extension frame and spacer flange (where
fitted), which are still bolted together, up and off the shaft. See Fig.
4.
7.
See Fig. 5. Loosen the screws in the shaft muff, pull the shaft off
and replace the motor.
8.
See figure 6. Before remounting the pump shaft, remove any dirt
and grease from the motor shaft and the muff’s internal clamping
surfaces. Mount the pump shaft loosely. Position the balance hole
above the keyway.
9.
Fit the back plate and extension frame over the shaft.
10.
Tighten the bolts.
11.
Turn the pump back so it stands on its legs.
12.
Fit the impeller and secure it with the cap nut/inducer.
Remember to use the proper tightening torque:
M10:
33 ft-lb
(45 Nm)
M14:
52 ft-lb
(70 Nm)
M20:
148 ft-lb
(200 Nm)
5. Maintenance
Back plate
Screw
Extension frame
Motor
Fig. 4: Unscrew motor flange bolts
Fig. 5: Loosen screws
Shaft
Screw
Motor
Keyway
Motor shaft
Balance hole
Pump shaft
Fig. 6: Mount pump shaft