Maintenance And Repair - Homa MX 34 Serie Originalbetriebsanleitung

9. Maintenance and Repair

In case of a defect of the pump, a repair shall be car-
ried out only by the manufacturer or through an authorized
workshop. Modifications of the pump must be confirmed by
the manufacturer. Only HOMA spare parts shall be used.
In accordance with the product liability law we point out
that we shall not be liable for damages caused by our
product due to unauthorized repair by persons other than
the manufacturer or an authorized workshop or due to the
use of spare parts other than original HOMA parts. The
same product liability limitations are valid for accessories.
Before maintenance or repair disconnect the pump
from the power supply to avoid accidental starting of the
pump!
Before maintenance or repair make sure that all rotat-
ing parts stand still!
Before carrying out maintenance and service, the
pump must be thoroughly flushed with clean water. Rinse
the pump parts in clean water after dismanteling.
At pump types with oil chamber an overpressure can
escape with loosening of the oil chamber control screw.
Screw only when pressure balance took place.
Pumps running under normal operation conditions should
be inspected at least once a year. If the pumped liquid is
very muddy or sandy or if the pump is operating continu-
ously, the pump should be inspected every 1.000 operating
hours.
For long and trouble-free operation of the pump, following
points should be checked regularly:
- Nominal current (A): Check with amp-meter.
- Pump parts and impeller: Check for possible wear.
Replace defective parts.
On pumps with motors from 19,5 kW (P1), the impeller is
fixed by a clamping unit. For disassembly and assembly of
the impeller please ask HOMA service department for spe-
cific instruction manual.
- Ball bearings: Check the shaft for noisy or heavy opera-
tion (turn the shaft by hand). Replace defective ball bear-
ings. A general overhaul of the pump is usally required in
case of defective ball bearings or poor motor function. This
work must be carried out by an authorized
service workshop.
- Cable entry: Make sure that the cable entry is watertight
and that the cables are not bent sharply and/or pinched.
Visual control at pump types with oil chamber (models
without cooling jacket or model „U" with cooling
jacket and open cooling circuit):
Oil level and oil condition:
The condition of the mechanical seals can be visually con-
trolled as follows:
Put the pump in horizontal position, so that the screw of the
oil chamber is on top (for larger 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.
The oil should be replaced after 3000 operating hours.
Oil type: degradable HOMA-ATOX. Used oil has to be dis-
posed according to the existing environmental rules and
regulations
Visual control at pump types without oil chamber with
cooling jacket and closed (internal) cooling circuit
(model „L"):
Cooling liquid:
The condition of the mechanical seals can be visually con-
trolled as follows:
Put the pump in horizontal position, so that the screw of the
leakage chamber is on top (for larger pumps: one of both
leakage chamber screws).
Remove the screw and take out a small quantity of cooling
liquid.
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.
The cooling liquid should be replaced after 3000 operating
hours.
Type: Ravenol (available on request). Used cooling liquid
has to be disposed according to the existing environmental
rules and regulations.
Servicing Contract
For a regular expert execution of all necessary mainte-
nance and inspection we recommend the conclusion of a
servicing contract by our HOMA Service. Please contact
our HOMA customer service.
Return of pumps
If a pump has been used for a liquid which is injurious
to health or toxic, the pump will be classified as contami-
nated.
If HOMA is requested to service the pump, HOMA must be
contacted with details about the pumped liquid, etc. before
the pump is returned for service. Otherwise HOMA can re-
fuse to accept the pump for service (see attachment).
Possible costs of returning the pump are paid by the cus-
tomer. However, any application for service (no matter to
whom it may be made) must include details about the
pumped liquid if the pump has been used for liquids which
are injurious to health or toxic.
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