Elmo Rietschle V-KTA 140/4 - Manual (Page 21)

21 www.gd-elmorietschle.com © Gardner Denver Schopfheim GmbH, Gardner Denver Deutschland GmbH |
Z Y
X
O
1
Maintenance and repair
b
d
s
G
1
a c
Changing blades:
If the minimum height has already been reached or
if the blades have fallen below this level the whole
blade set must be changed.
NOTICE
Do not undo the slotted nuts (Fig. 4/w
1
) on the
housing lid (Fig. 5/b). Only the screws (Fig. 4/s) need
to be removed to change the blades.
Before refi tting the blades clean out the housing
and the rotor slots with compressed air. Place the
blades, with the radius outwards (Fig. 6/Y), such that
the bevel is in the direction of rotation (Fig. 6/O
1
) and
corresponds with the radius of the housing (Fig. 6/
Z).
Before refi tting the end cover (Fig. 5/b) redistribute
the grease from the bearing cover (Fig. 5/c) on to
the appropriate bearing. It is important that the shaft
end is completely clean so that no grease can enter
the housing, this could mix together with carbon
dust and give a viscous paste which would result in
the blades becoming stuck in the rotor slots.
When re-fi tting the end cover tighten the bolts even-
ly so that the end cover fi ts correctly onto the fi xing
pins. As soon as the cover is almost touching the
housing, we recommend during further tightening of
the bolts, the fan is moved in both directions. This
can be achieved by taking the grill at the cooling air
exit (F) away. This then ensures that the blades are
sitting correctly in their slots and avoids any edge
damage. Refi t the suction grid (Fig. 4/G).
NOTICE
Care should be taken that the bearing does not
become contaminated.
Fig. 6 Blades
O
1
Direction of rotation
X Minimum heigh
Y Slanting side of the blade
Z Drilled holes in the housing
Fig. 5 Lubrication/ Blades
G
1
Protective cover
a Bolt
b Housing lid
c Bearing cover
d Blade
s Screws