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Idiomas disponibles
d
Maintenance and Servicing
When maintaining these units and having such situations where
personnel could be hurt by moving parts or by live electrical parts the
pump must be isolated by totally disconnecting the electrical supply. It is
imperative that the unit cannot be re-started during the maintenance opera-
tion.
Do not maintain a pump that is at its normal operating temperature as there
is a danger from hot parts.
1. Lubrication The lubrication points are (L); lubrication periods are as follows,
but minimum is once a year:
Operating hours
Model
50 Hz
VFT 25 - 60
7.000
VFT
80
5.000
VFT
100
5.000
VFT
140
6.000
VFT
180
6.000
VFT
250
6.000
VFT
340
6.000
VFT
500
6.000
Note! These greasing instructions are valid for operation at 20° C ambient temperature. At 40° C these should be reduced by 50 %.
We recommend the following grease types: Esso Unirex N3 or other equal greases (see label of recommended greases (M)).
2. Air filtration (pictures
to
The capacity of the pump could be reduced if the air inlet filters are not maintained correctly.
The filter cartridges (f) of the suction filter (S) have to be cleaned monthly and replaced once a year (under extreme conditions more
often).
Changing the filter: Loosen thumb screws (g). Take off filter cover (h) complete with gasket. Remove filter cartridges (f) and clean or exchange.
Reassemble in reverse order.
3. Blades (pictures
to
)
Checking blades: The models VFT have 4 blades which have a low but permanent wear factor.
VFT 25 - VFT 100: first check after 4,000 operating hours, thereafter every 500 operating hours.
VFT 140 - VFT 500: first check after 2,000 operating hours, thereafter every 500 operating hours.
Screw off end cover (e). To remove the housing cover (b) from the housing the bolt (a) located in the centre of the bearing cover (c) should be
removed. To facilitate this one of the fixing bolts (s) from the housing cover should be screwed into the thread in the centre of the bearing cover (c).
Remove the blades (d) and check. All blades must have a minimum height (X) of:
Model
X (minimum hight)
VFT 25 - 40
22 mm
VFT 60
25 mm
VFT 80 - 100
30 mm
VFT 140 - 250
40 mm
VFT 340 - 500
60 mm
Blades must be changed completly.
Note! The VFT 500 has 2 blades per slot.
Changing blades: if the minimum height (X) is reached, then the whole set of rotor blades should be changed.
Before refitting the blades blow out the housing and the rotor slots. Place the blades with the radius outwards (Y) such that the bevel is in the
direction of rotation (O
) and corresponds with the radius of the housing (Z).
1
Before refitting the housing cover (b) redistribute the grease from the bearing cover (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 blades being stuck into the rotor slots.
Note! Care should be taken that the bearing should not become contaminated.
When re-fitting the housing cover (b) tighten the bolts evenly so that the end cover fits correctly onto the fixing points. When the end cover is almost
touching the housing we recommend moving the fan in both directions whilst further tightening the bolts. This can be achieved by removing the
motor fan cover. This then ensures that the blades are sitting correctly in their slots and avoids any edge damage. Refit the end cover (e).
Grease
60 Hz
every bearing
7.000
4.500
3.500
6.000
5.000
4.500
6.000
5.000
)
b
e
s
g
4 g
6 g
6 g
8 g
8 g
8 g
10 g
10 g
Z
X
O
1
h
Y
S
f
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