EngliSH | 39
Visual check on pumps with oil barrier chamber
Oil Level
Please take the precise filling quantity from the spare
parts list or make a request to the manufacturer.
Oil Condition
The condition of the slide ring seals can be checked by a
visual check on the oil. Lay pump horizontally so that the
oil chamber level checking screw located on the side of
the motor housing (or, in larger pumps, one of the two oil
chamber level checking screws) is on top.
Remove the screw and remove a small amount of oil.
Cloudy or milky oil indicates a defective shaft seal. In this
event, have the condition of the shaft seal checked by a
HOMA specialist workshop or the HOMA works custom-
er service. Type of oil: biodegradable HOMA ATOX. Used
oil is to be disposed of correctly in accordance with the
current regulations on environmental protection.
Functional test on all safety and monitoring systems
Monitoring systems include temperature sensors in the
motor, sealing chamber control etc. Motor protection
relays, overvoltage relays and other tripping devices can
generally be triggered manually for testing. For checks on
the sealing chamber control or the temperature sensors,
the machine must have cooled down to ambient tempera-
ture and the electrical connecting cable of the monitoring
system must be disconnected in the switch cabinet. The
monitoring system is then checked with an ohmmeter.
The following values are to be measured:
Bimetal sensor
s
:
value equal to „0“ - pass through
Thermocouples:
A thermocouple has a cold resistance
between 20 and 100
Ω
. With 3 sensors in series, the re-
sulting value would be from 60 - 300
Ω
.
PT100 sensor
s
:
PT100 sensors have a value of 100
Ω
at 0°C. Between 0°C and 100°C, this value increases by
0.385
Ω
per 1°C. At an ambient temperature of 20°C, the
calculated value is 107.7
Ω
.
Sealing chamber control:
the value must rise towards
„infinity“. If values are lower, there may be water in the
oil. Please also note the indications of the evaluation relay,
available as an option.
In the event of larger deviations, please consult the
manufacturer!
The operating instructions for the auxiliary hoisting
gear explain how to check its safety and monitoring
systems.
General overhaul
In addition to the normal maintenance work, the motor
bearings, shaft seals, O-rings and electrical power lines
are checked and, if appropriate, exchanged during a gen-
eral overhaul. This work may only be performed by the
manufacturer or by an authorized service workshop.
Exchanging service fluid
s
When drained off, service fluids must be checked for con-
tamination and admixtures of water. If the service fluids
are heavily contaminated and contain more than a 1/3 wa-
ter fraction, they must be exchanged once more after four
weeks. If there is water in the service fluids again, there is
a suspicion of a defective seal. Please consult your man-
ufacturer. In the event of a defective seal, the display will
again light up within four weeks following the exchange if
a sealing chamber control or leakage monitoring is used.
In general, the following applies when exchanging
service fluids: Switch the machine off and let it cool
down, disconnect it from the grid (have this done by a
person skilled in the art!), clean it and place it in a ver-
tical position on a firm surface. Warm or hot service
fluids may be under pressure. Escaping service fluids
may cause burns. So allow the machine first to cool
down to the ambient temperature! Secure it against
falling over and/or slipping away!
6.4. Sealing space
•
Carefully and slowly unscrew the oil filler plug of the
sealing space.
Caution: The service fluid
s
may be under pressure!
•
Unscrew the oil drain screw. Drain the service fluids
and collect them in a suitable container. Clean the
drain plug, fit a new sealing ring and reinsert it. The
machine must be tipped slightly to one side to ensure
it is completely emptied.
Ensure that the machine cannot fall over and/or slip
away!
•
Lay the machine horizontally and refill it with service
fluids. Please use the prescribed service fluids and
filling quantities. The filling quantity is 1.1 litre.
•
Clean the filler plug, fit a new sealing ring and reinsert
it.
Screw
(drain oil)
Screw
(fill with oil)
