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Visual inspection of accessories
Inspect accessories such as suspension units and hoist-
ing gear to check whether they are secured in a stable
manner. Loose and/or defective accessories should be
repaired immediately or replaced.
Fill Level Check in Compression Room/Chamber
Visual control at pump types with oil chamber (models
without cooling jacket or model „U" with cooling
jacket and open cooling circuit):
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 mechanical seals can be visually
controlled as follows: Put the pump in horizontal position,
so that the screw of the oil chamber is on top (for larg-
er pumps: one of both oil chamber screws). Remove the
screw and take out a small quantity of oil. The oil becomes
greyish white like milk if it contains water. This may be the
result of defective shaft seals. In this case the condition
of the shaft seals should be checked by a HOMA Service
shop. Oil type: degradable HOMA-ATOX. Used oil has to
be disposed according to the existing environmental rules
and regulations.
Visual control at pump types without oil chamber with
cooling jacket and closed (internal) cooling circuit
("L" Design):
Quantity of Coolant
Please take the precise filling quantity from the spare
parts list or make a request to the manufacturer.
The condition of the mechanical seals can be visually con-
trolled as follows: Set up the pump vertically and unscrew
the ventilation screw 903.02 located above and remove
a small quantity of coolant. If the cooling liquid becomes
grey (original colour: light pink) this may be the result of
defective shaft seals. In this case the condition of the
shaft seals shoul be checked by a HOMA Service shop.
Type: Ravenol (available on request). Used cooling liquid
has to be disposed according to the existing environmen-
tal rules and regulations.
Functional inspection of safety and control devices
Monitoring devices are temperature sensors in the motor,
sealing room monitors, motor protection relays, overvolt-
age relays, etc.
Motor protection and overvoltage relays and other trip el-
ements can generally be triggered manually for test pur-
poses. To inspect the sealing room monitor or the tem-
perature sensor, the machine must be cooled to ambient
temperature and the electrical supply cable of the moni-
toring device in the switch cabinet must be disconnected.
The monitoring device is then tested with an ohmmeter.
The following values should be measured:
Bi-metal sensor: Value = "0" - throughput
PTC sensor: A PTC sensor has a cold resistance of be-
tween 20 and 100 Ω. For 3 sensors in series this would
result in a value of between 60 and 300 Ω.
46 | EngliSH
All manuals and user guides at all-guides.com
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.
•
Caution: The lubricant may be pressurized!
•
Make sure that the machine cannot fall and/or slip
away!
•
•
Slowly and carefully remove the filling plug from the
sealing room.
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.
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.
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