Wacker Neuson PTS 4V, Operator'S Manual

Page: 36 / 60

wc_tx003331gb.fm
36
Maintenance PTS 4V
5.11 Adjusting the Impeller Clearance
If it is necessary to replace impeller or volute insert, be sure clearance between
impeller and insert is adjusted correctly.
The impeller (e) should be as close to the insert (a) as possible without rubbing
against it. Clearance is adjusted by adding or removing shims (b) from behind
insert. Inserts are attached to the pump cover and must be unbolted (c) before they
can be removed.
Check clearance (d) between impeller and insert by slowly pulling starter rope to
turn impeller.
Note: Remove spark plug to make it easier to turn impeller. On diesel engines,
open decompression device before cranking engine.
If starter or crank is difficult to turn, or rubbing is heard from inside pump, the
impeller and insert are too close to each other. Remove a shim from behind insert
and check again for rubbing. Continue removing shims until impeller turns easily.
Note: It is important not to remove too many shims or the clearance between the
impeller and insert will become too wide and pump performance will be reduced.
As the impeller wears down, additional shims may be required to maintain the
clearance between the impeller and insert.
wc_gr010902
a
b
c
d
e