Wacker Neuson PT 3A, Operator'S Manual

Page: 40 / 60

Maintenance PT 2/3 /...
wc_tx000013gb.fm
40
3.16 Adjusting Impeller Clearance
See Graphic: wc_gr000035
If it is necessary to replace the impeller or the volute insert, be sure
clearance between impeller and insert is adjusted correctly. The
impeller (a) should be as close to the insert (b) as possible without
rubbing against it. Clearance is adjusted by adding or removing shims
(c).
3.16.1 Remove spark plug (on units with Hatz engine, place speed control
lever in STOP position) so that engine will not start.
3.16.2 Check clearance between impeller and insert by slowly pulling starter
rope to turn impeller.
If starter rope is difficult to pull, 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.