16
zed workshop. Conversions or alternations of the machi-
ne/unit are permittes only after arrangement with the ma-
nufacturer. 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 carrying out maintenance and service, the
pump must be thoroughly flushed with clean water. Rinse
the pump parts in clean water after dismanteling.
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
continuously, the pump should be inspected every 1.000
operating hours.
An oil check should be done by your HOMA service only.
For long and trouble-free operation of the pump, following
points should be checked regularly:
- Nominal current (A): Check with amp-meter.
- The pressure hose between tank and control box must
not be bent sharply and it must be completely tight to en-
sure perfect operation.
- Cable entry: Make sure that the cable entry is watertight
and that the cables are not bent sharply and/or pinched.
- Pump parts: Check for possible wear. Replace defective
parts.
- Ball bearings: Check the shaft for noisy or heavy opera-
tion (turn the shaft by hand). Replace defective ball bea-
rings. 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.
10. Fault Finding Chart
Before maintenance or repair disconnect the pump
from the power supply to avoid accidental starting of the
pump!
Fault Cause
Remedy
Pump does not start
Supply failure
Check the voltage
Impeller blocked by
impurities
Close the incoming
sewer, emptying the
tank with the
diaphragm pump,
open the clening
cover, clean the tank
by hand and remove
solids which may
block the pump
Pressure hose is leaky
or clogging
Check the hose and
clean or replace
Fuses blow due to use
of wrong type of fuse
Install fuses of the
correct type
Pump does not stop
Pressure hose is leaky
or clogging
Check the hose and
clean or replace
Control box failure
Check the control box
and replace it if
necessary
Swing check valve is
blocked or leaky
For emptying the
dischrage pipe
tightened the
drainscrew at the
swing check valve
housing. Loose the
elastic union piece
and screw off the gate
valve. Check and
clean the swing check
valve. Never take off
the housing from the
tank.
Failure advice or
alarm advice at the
control box
see 6.2.
