TLT-Turbo GmbH
Installation, operating and maintenance instructions.
For axial flow fans
Page 10
Series fan division
Bad Hersfeld
Type AXO ... / ...
of 12
MBW-AXO.DOC
Issue: 03.2004
13. General maintenance
In regular intervals, but at least once a year, the fan should be checked by a
specialized company.
Items to be checked are: correct functioning
operating
condition
visual test of weld seams
screwed
connections
low
vibrations
motor/current absorption (see section maintenance /
motor)
If required, the fan has to be cleaned, maintained and repaired.
If the fan is not always used, it has to run at least 1 hour every 2 months
approximately. This is important, because the motor bearings suffer if not used for
a long time.
All checks, maintenance and repair works should be noted in a inspection
book.
14. Description of the impeller
Impeller hub of aluminum, blades of plastic.
Depending on the desired output they are supplied with 6, 8, 9, 10 or 12 blades.
The impeller blades are not adjustable.
The blade angles in the performance curve sheets refer to the blade tips.
Impeller disassembly
a) Disconnect the motor from the electric power supply.
b) Loosen the hub lock.
c) Extract the impeller from the motor shaft using a special extractor.
d)Handle the impeller with care. Don't roll it or deposit it on the blades. Avoid
shocks on the blades.
Assembly of the impeller
Slightly grease the end of the shaft. Then mount the wheel using a special fitting
tool.
(Threaded hole in the face of the shaft according to DIN 332).
Make sure that the impeller does not slide along parts when turning it by hand.
Finally the wheel is secured on the shaft using the parts belonging to it (thrust disk
1
, hexagonal screw
2
, seal
3
, and screw securing
4
).
(Refer to the drawing in the annex)
