EngliSH | 45
7. Repairs
7.1. General
The following repairs can be carried out on this machine:
•
Changing the impeller and pump unit
•
Changing wear rings
When carrying out repair work, the following information
should always be noted:
•
Round sealing rings as well as existing seals should
always be replaced.
•
Screw fixings such as spring washers should always
be replaced.
•
The correct torques must be observed.
In general, the following applies to repairs:
Switch off the machine, disconnect it from the mains
(have this done by an electrician), clean it and place
it on a solid base in a horizontal position. Secure it
from falling over and/or slipping.
If not otherwise stated, the torque values of the
below tables should be used. Values stated are for clean,
lubricated screws. Fixing torque [Nm] for screws A2/A4
(Coefficient of friction = 0,2)
A2/A4,
Hardeness class 70
A2/A4,
Hardeness class 80
DIN912/DIN933
DIN912/DIN933
M6
7 Nm
11,8 Nm
M8
17 Nm
28,7 Nm
M10
33 Nm
58 Nm
M12
57 Nm
100 Nm
M16
140 Nm
245 Nm
M20
273 Nm
494 Nm
7.2. Changing the impeller and pump unit
Changing the impeller and the pump unit.
•
Loosen and remove the screws on the sealing
housing.
•
Secure and remove the pump housing from the
sealing housing with suitable equipment, e.g.
hoisting gear. Place on a secure base.
•
Fasten the impeller with suitable equipment, loosen
and remove the impeller fastening (cylindrical screw
with socket hex).
Pay attention to the locking screw!
•
Remove the impeller from the shaft using a suitable
extractor.
•
Cleaning the shaft
•
Attach a new impeller to the shaft.
PT 100 sensor:
PT 100 sensors have a value of 100ohms
at 0°C. Between 0°C and 100°C this value increases by
0.385
Ω
per 1°C. PT 20 sensors have a value of 107.7
Ω
at 20°C.
Moisture sensor:
This value must approach infinity. If
there is a low value, there may be water in the oil.
Also observe the instructions of the optionally available
evaluation relay.
In the case of larger deviations, please
consult the manufacturer.
Please consult the appropri-
ate operating manual for details on inspecting the safety
and monitoring devices on the auxiliary lifting gear.
General overhaul
During this the bearings, shaft seals, O rings and power
supply cables are inspected and replaced as required in
addition to normal maintenance work. This work may only
be conducted by the manufacturer or an authorized ser-
vice workshop.
Changing the lubricant
The drained lubricant must be checked for dirt and water
content. If the lubricant is very dirty and contains more
than 1/3 water, it must be changed again after four weeks.
If there is again water in the lubricant then, it seems likely
that a seal is defective. In this case, please consult the
manufacturer. If a sealing room or leakage monitoring sys-
tem is being used, the display will light up again within
four weeks
of changing the lubricant if a seal is defective.
The general procedure for changing lubricants is as
follows: Switch off the machine, let it cool down, dis-
connect it from the mains (have this done by an elec-
trician), clean it and place it vertically on a solid base.
Warm or hot lubricants may be pressurized. The leak-
ing lubricant may cause burns. For that reason, let the
machine cool down to ambient temperature before
you touch it.
6.4. Sealing chamber
As there are several versions and designs of these mo-
tors, the exact location of the screw plugs varies depend-
ing on the pump unit used.
•
Slowly and carefully remove the filling plug from the
sealing room.
Caution: The lubricant may be pressurized!
•
Remove the drain plug. Drain the lubricant and collect
it in a suitable reservoir. Clean the drain plug, fit with
a new sealing ring and screw it in again. For complete
drainage, the machine must be slightly tipped on to
its side.
Make sure that the machine cannot fall and/or slip
away!
•
Fill lubricant by means of the opening in the filling
plug. Comply with the specified lubricants and filling
quantities.
•
Clean the filling plug, fit with a new sealing ring and
screw it in again.
