8
7.2
Servicing (Dismounting and Mounting Instructions)
General
On request, trained service engineers will be at your dis-
posal for mountings and repairs.
In case of repairs performed by the customer’s own per-
sonnel or our trained mechanics, it must be ensured
that the pump is completely empty and clean.
This applies in particular to pumps which, in case of
repair, are sent to our factory or to one of our contrac-
tual repair shops.
In protection of our staff and for reasons of environmen-
tal protection, we have to refuse to accept for repair any
pumps filled with liquid pumped. Otherwise, we will have
to charge the customer/operator with the costs for an
ecologically acceptable waste disposal.
In case of repair of pumps operated with dangerous
materials
†
and/or liquids harmful to the environment,
the customer/operator must advise hereof his own and-
or our local mounting personnel or, in case of return, our
factory and/or contractual service shop of his own
accord. In such a case, evidence of the liquid handled,
e.g. in the form of a DIN safety data sheet will have to be
presented to us when requesting a service engineer.
†
Dangerous materials are:
– Toxic substances
– Substances detrimental to health
– Caustic substances
– Irritants
– Explosive materials
– Fire-promoting, highly, easily and normally inflam-
mable materials
– Carcinogenic substances
– Foetopathic substances
– Genes-changing substances
– Substances which are dangerous to human beings in
any other way
When working locally, the customer’s own and/or our
mounting personnel must be referred to dangers which
may be caused in connection with repairs.
The most important dismounting and mounting opera-
tions are described in these instructions. The mounting
steps described in the individual sections must be con-
sistently observed.
7.2.1
Dismounting the eccentric screw pump
Prior to commencing the dismounting, the following
operations must be performed:
– Disconnect power supply cable from the motor.
Motor must not be capable of being started.
– All shut-off elements in the discharge line must be
closed.
– Dismount discharge line and all auxiliary pipelines.
– Loosen screws at the fastening flange, and screw out.
7.2.1.1 Dismounting the stator
– Drain the liquid to be pumped from the discharge
casing.
Note:
Use collecting tank.
– Remove hexagon nuts (609) and washers (610) from
the tie rods (611).
– Withdraw suction cover (505).
– Remove tie rods (611).
– Withdraw stator shell (516) and O-ring (517).
– Withdraw stator (402) from rotor (401).
Note:
In case of stiffness, turn stator (402) simulta-
neously by means of chain tongs. For these purpo-
ses, fix hollow shaft (125) and/or drive shaft (118).
7.2.1.2 Dismounting the rotor and rotor-side joint
Dismounting of the rotor and the rotor-side joint is
effected following the dismounting of the stator (402).
Please refer to Section 7.2.1.1 above.
– Dismount vent line for mechanical seal (224).
– Remove hexagon nuts (618) and spring ring (619) as
well as hexagon screws (617).
– Withdraw discharge casing (504) over the rotor
(401). In doing so, see to it that the precision-
machined rotor is not damaged.
– Remove gasket for discharge casing (511).
– Cut buckle on clamping band (306) with a metal saw,
and with a screw driver, press out to both sides.
Remove clamping band (306) from the cover sleeve
(308) (please refer to Figure 2 below).
Figure 2: Removal of the clamping band.
!
– By means of a screw driver, lift cover sleeve (308)
and withdraw axially towards the coupling rod (307).
– Collect oil filling in a tank.
– Drive retaining sleeve (304) over the collar of the
coupling rod (307). In doing so, do not deflect coup-
ling rod (307) (please refer to Figure 3 below).
Figure 3: Dismounting the retaining sleeve.
– Eject coupling rod pin (301).
– By means of a brass ejector, drive out the two bushes
for coupling rod pin (303) by one half. For these pur-
poses, incline coupling rod (307) (please refer to
Figure 4 below).
Series SLTP, SETP, SNTP, SLTBP, SETBP, SNTBP
ALLWEILER
a
