20
Pump Typ Z
Version: 27215 -G.1
Schmalenberger GmbH + Co. KG
D-72072 Tübingen / Germany
5.2.5
Dismantling the pump Type
NZ, FZ 6520
Step 1:
Unscrew the hexagon screws pos. 901.04
out of the pressure pipe and remove them.
Now remove the hexagon nut pos. 920.05
from the spiral housing. Lift the spiral
housing pos. 102 off.
Now you can remove the two clamp
gaskets pos. 400.01 and 400.02.
Step 2:
Unscrew and remove the impeller nut pos.
922 and the distance washer pos. 554.01.
Now you can pull off the impeller pos. 233
and remove the key pos. 940.
Step 3:
Dismantle the pressure cover pos. 163 by
unscrewing the hexagon nut pos. 920.06
and remove the protective shaft sleeve
pos. 524.
Make sure that for the dense shaft bushing
that you take off the shaft sealing ring pos.
420.
Remove the intermediate piece pos. 132.
By unscrewing the hexagon screws pos.
901.01 on the motor flange and the
transition piece pos. 721, you can remove
the intermediate piece together with the
cover plate pos. 167 and the pressure pipe
pos. 710.
Step 4:
The throttling bush pos. 542 is glued or
pressed into the throttling bush holder pos.
542. The throttling bush holder is glued into
the pressure cover pos. 163. Dismantle the
throttling bush only if it is to be replaced.
The replacement is described in chapter
5.2.6.
5.2.6
Shaft sealing ring / throttling
bush
With the delivery of a new throttling bush
you will receive fitting instructions
(AA-
18003)
how to install it correctly in your
centrifugal pump.
To fit the throttle bush you need a special
centring tool that may be ordered from the
manufacturer.
5.2.7
Pump re-assembly
Re-assembly is basically in the reverse
order to dismantling.
Observe the following preparatory steps:
•
Thoroughly clean all individual parts of
dirt and residual glue (throttling bush
seating).
•
Inspect all parts for wear and be sure to
replace any that are worn or damaged.
•
Clamp gaskets and O-rings must al-
ways be replaced by new ones. Grease
O-rings prior to installation.
•
If a new throttling bush made of silicon
carbide (SiC/SiC) was glued in place,
then the glue must be allowed to harden
for approx. 24 hours before assembly
can proceed. See assembly instructi-
ons
(AA-18003)
. Make sure that this
period of time is observed!
Information:
When re-assembling install new
gaskets.
Information:
The throttling bushes built used
in the centrifugal pumps are
not
wear-free.
Warning!
When dismantling the pump in-
spect the throttling bush and pro-
tective shaft sleeve for damage.
Be sure to replace a damaged
throttling bush and / or protective
shaft sleeve.
Important:
Never use a throttling bush you
have made yourself! We can ac-
cept no liability.
