APV W+ Series, Manual

Page: 29 / 78

5.3 Replacement of motor
The standard motor for the W+ pump has a front-mounted bearing. If
the motor is replaced, the new motor must also have a front-mounted
bearing. 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.
Disconnect the pump from the power supply.
2.
Remove the pump body. See Fig. 9.
3.
Remove the impeller.
4.
Remove the motor shroud and, if possible, stand the pump on the
end surface of the motor. See Fig. 10.
5.
Undo the four bolts between the motor and extension frame and
remove them. See Fig. 10.
6.
Lift the back plate and extension frame, which are still bolted
together, up and off the shaft. See Fig. 10.
7.
See Fig. 11. Loosen the screws in the shaft and pull the shaft out,
then replace the motor.
8.
See figure 12. Before mounting the new pump shaft, remove any
dirt and grease from the engine shaft and the sleeve coupling's
internal clamping surfaces. Mount the pump shaft loosely.
Position the balance hole above the keyway.
9.
Fit the protective plastic sleeve on the shaft.
10.
Press the back plate and extension frame down over the shaft.
11.
Tighten the bolts.
12.
Turn the pump back so it stands on its legs/console.
13.
Fit the impeller.
Remember to use the proper tension:
M10: 45 Nm (33 lbf ft)
M14: 70 Nm (52 lbf ft)
M20: 200 Nm (148 lbf ft)
14.
Fit the plastic star (pos 21) on the impeller (pos 4).
15.
Fit the pump body (pos 1) with the clamp ring (pos 2).
16.
Push the shaft (pos 6) forward until the impeller (pos 4) is
touching the plastic star (pos 21).
17.
Tighten the shaft (pos 6) to 30 Nm for 8 mm screws and
55 Nm for 10 mm screws.
18.
Remove the star (pos 21) by pulling it out through the intake.
5 Maintenance
19
Pos 4
Pos 21
Pos 1
Fig. 12
Impeller
Pump body
Rear flange
Screw
Extension frame
Motor
Motor
Keyway
Motor shaft
Balance hole
Pump shaft
Protective
sleeve
Fig. 9
Fig. 10
Fig. 11
Shaft
Screw
381327
381328
381329a
381331
381332
fig01