10
5
Change of impeller / Check of diffuser and wear ring
Dismantling
m
CAUTION! Impellers may have sharp
edges. Take care not to cut yourself on
them.
Unscrew the nuts that secures the wear ring and re-
move it. Lock the impeller with a screwdriver or similar
and unscrew the impeller screw and remove the screw
and the impeller washer.
Hint!
Use a standard 2-arm impeller puller or two bend-
ing tools and pull out the impeller from the shaft. The
impeller hub has marks for the puller.
For removal of diffuser unscrew nuts that secures the
diffuser and pull out the diffuser.
Hint!
On J 205 it is preferred to dismantle the diffuser
and wear ring together by using a pair of bending tools.
Hint!
On J 405 there are two threaded holes M10 were
bolts can be threaded in to pull out the diffuser.
Check the condition of the diffuser, wear ring and impel
-
ler. The diffuser/impeller must be replaced if it is worn
down. The wear ring should be replaced if the rubber
is worn down to 2 mm (1/16”) or is uneven. Always re
-
move the key and inspect the shaft seals when chang-
ing the impeller.
Assembly
Clean the shaft end. Mount the impeller on the shaft,
secured by the key, impeller washer and impeller
screw. Check that the back side of the impeller runs
free of the wear plate with a clearance of 0.5-1.0 mm
(0.02”-0.04”). Adjust the clearance with shims between
impeller and shaft / shaft sleeve if necessary. Mount
the diffuser and tighten the nuts to J 205=45 Nm,
J 405=140 Nm, J 604=273 Nm. Mount the wear ring
with nuts until the impeller runs free with a clearance of
0.1-0.3 mm (0.004”-0.012”). Mount strainer and base
plate, and tighten the nuts firmly. (Figure 10)
Note!
J 205 - J 405:
Never run the motor without having the
impeller mounted. This can cause damage to o-rings in
seal unit.
J 604:
When impeller is removed, be aware that the
rotating primary seal is loose.
Figure 10:
Change of impeller / Check of diffuser and
wear ring
marks on impeller hub
for standard puller
Summary of Contents for J 205
Page 30: ...30 11 Sectional drawing Tools J 205 ...
Page 31: ...31 J 405 ...
Page 32: ...32 J 604 ...
Page 37: ...37 ...
