11a. In the case of water-flushed shaft seals, check the rear seal rings
(item 5.7, 5.6) for wear too, and replace if necessary.
12. Fit new O-rings on the stationary seal face and rotary seal face.
NB! Remember to moisten these with water.
13. Fit the rotary seal face (item 5.7) on the impeller without using
tools.
NB! The "notch" in the rotary seal face must be located so that it
mates with the driving pin (item 5.8) in the impeller hub.
13a. In the case of water-flushed/aseptic seals, also fit a rotary seal
face (item 5.7) with its O-ring (item 5.5) in the location on the
shaft, again without using tools.
14. Fit the stationary seal face (item 5.6) in the back plate without
using tools.
NB! The "notches" in the stationary seal face must mate with the
driving dogs on the carrier in the back plate. Check that the
stationary seal face is posi tioned so that it slides backwards and
forwards easily in the back plate.
14a. In the case of water-flushed/aseptic seals, remove the drainage
baffle* (item 5.4) from the stationary seal faces for both the front
and rear seal before fitting them in the seal cover (item 5.9) and
back plate (item 7a, 7b) respectively.
* The W+50/600 has no drainage baffle.
15. After fitting, clean the wearing surfaces.
15a. For liquid-flushed/aseptic seals, remount the back plate
(item 7a, 7b).
16.
Fit the impeller (item 4). Remember to use the proper tightening
torque:
M10: 45 Nm (33 lbf ft)
M14: 70 Nm (52 lbf ft)
M20: 200 Nm (148 lbf ft)
17. Check that the locating pin (item 8), where fitted, in the top of the
back plate mates with the half hole in the pump body and
carefully, to avoid damaging the O-ring, press the pump body
(item 1a,1b) in over the O-ring (item 6) and fasten with the clamp
ring (item 9a) or body screws, observing the correct tightening
torque.
M8: 30 Nm (22 lbf ft)
M10: 55 Nm (41 lbf ft)
M16: 180 Nm (132 lbf ft)
5. Maintenance
Fitting
Positioning the water supply
connections
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