SPXFLOW CombiFlexBloc Series, Instruction Manual, Page: 29 / 79

CFB/EN (1808) 2.4
Disassembly and assembly 27
CombiFlexBloc
7.5 Replacing the impeller and the wear ring
The play between the impeller and the wear ring is 0,3 mm to the diameter at delivery. In
case the play has increased to 0,5-0,7 mm due to wear, the impeller and the wear ring
should be replaced.
7.5.1 Disassembling of the impeller
The item numbers used are referring to figure 4.
1 Remove the Top Pull Out unit, see paragraph 7.4.1 "Disassembly Top Pull Out unit".
2 Remove the cap nut (1820) and the gasket (1340). Sometimes the nut has to be
heated to break the Loctite-contact.
3 Remove the impeller (0120) with a pulley puller, or wrest the impeller by inserting for
instance 2 big screwdrivers between the impeller and the stuffing box cover (0110).
4 Remove the gasket (1320).
5 Remove the impeller key (1860).
7.5.2 Mounting the impeller
1 Place the impeller key (1860) in the key way of the pump shaft.
2 Fit the gasket (1320).
3 Push the impeller onto the pump shaft.
4 Degrease the thread on the pump shaft and the thread in the cap nut.
5 Fit the gasket (1340)
6 Put a drop of Loctite 243 on the thread and fit the cap nut. For tightening moment of
the cap nut see paragraph 10.3.2 "Tightening moments for cap nut".
7 Mount the Top Pull Out unit, see chapter 7.4.2 "Assembly Top Pull Out unit".
Figure 4: Disassembling of the impeller.