General Overhaul; Repairs - Wilo EMU FA+T Einbau- Und Betriebsanleitung

MAINTENANCE AND REPAIR
• Motor T 72:
Upper roller bearings: 20 g
Lower roller bearings: 160 g
4. Clean the grease nipples and screw the screw
plug(s) (F and F+) back in.
8.3.9. T 24 ... T 72: Draining condensation water
Fig. 17: Condensation water screw plug
S- Drainage screw for condensation water
1. Remove the screw plug (S-).
2. The condensation water will drain out by gravity
and must be collected in a container.
3. Clean the screw plug (S-), replace the seal ring
and screw it back in.

8.3.10. General overhaul

In a general overhaul, the normal maintenance
work is carried out and in addition the motor
bearings, shaft seals, O-rings and power supply
cables are checked and replaced, if necessary.
This work may be performed only by the manu-
facturer or an authorised service workshop.

8.4. Repairs

DANGER due to toxic substances!
Pumps that pump liquids hazardous to health
must always be decontaminated before un-
dertaking any other work! Otherwise, there
is a risk of fatal injury! Wear the necessary
physical protection equipment!
BEWARE of sharp edges!
Sharp edges can form on the impellers and
hydraulic opening. There is a risk of injury!
Wear the necessary protective clothing, such
as protective gloves.
Before carrying out repairs:
• Disconnect the pump from the power supply,
secure it against being switched on inadvertently
and allow the pump to cool down.
• Dismantle the pump according to the chapter
'Removal' and clean it thoroughly, particularly the
hydraulics. Immediately wipe up any drips!
• Make sure that all the operationally-relevant
parts are in good condition.
• Always replace O-rings, seals and screw locking
devices (spring lock washers, Nord-Lock wash-
ers).
• The specified tightening torques must be com-
plied with.
• Never use force when carrying out this work!
8.4.1. Use of screw locking
Screw locking is used on all screws. This must
always be renewed after disassembly.
The screw locking can be applied in different
ways:
• Liquid screw locking compound, e.g. Loctite 243
• Mechanical screw locking with Nord-Lock washer
Installation and operating instructions Wilo-EMU FA + T-Motor
Liquid screw locking compound
Liquid screw locking compound can be unfas-
tened by applying increased force. If this is not
possible, the connection must be heated to
about 300 °C in order to be released. The affected
components must be thoroughly cleaned and,
on assembly, once again have the screw locking
compound applied to them.
Mechanical screw locking
The Nord-Lock washer is only used on bolts with
strength class 10.9 which have been coated with
Geomet.
The Nord-Lock washer must not be used for
screw locking with stainless screws!
8.4.2. Which repair work is allowed to be performed?
• Impeller change
• Change of hydraulics
• Readjust the suction port of half open SOLID
impellers (G-impeller)
8.4.3. Hydraulics and impeller change
There are 2 different dismantling variants, de-
pending on the impeller geometry:
• In variant 1, the hydraulics must always be
removed in order to change the impeller.
• In variant 2, the impeller can be dismantled
separately. The impeller must be dismantled in
order for the hydraulics to be changed.
Variant 1: Hydraulics and impeller change
Fig. 18: Component overview
Hexagon nuts for hy-
1
draulics attachment
2 Hydraulics
1. Place the pump upright on a firm surface.
Make sure that the pump cannot fall over and/
or slip!
2. Unscrew the hexagon nuts (1) for fastening the
hydraulics on the sealing or bearing housing.
3. Secure the hydraulics (2) with suitable means and
pull the motor with impeller up and off. If neces-
sary, use suitable lifting equipment with adequate
bearing capacity!
4. Place the motor horizontally on a firm surface and
secure it against slipping.
5. Secure the impeller (3) with suitable means, un-
screw and remove the fastening screw (4).
Observe the screw locking!
6. Pull the impeller (3) off the shaft with a suitable
puller.
7. Clean the shaft.
8. Push a new impeller onto the shaft.
Make sure that the sliding surfaces are not
damaged!
3 Impeller
4 Impeller fastening screw
English
67