If the pump is under warranty, do not disassemble it without consulting the manufacturer or their authorised representative. If this is not
done, then the warranty will not be applicable.
Prior to opening the pump, check that:
❑
it is free from internal pressure.
❑
if liquefied gas is being pumped, that all the gas has been vented.
❑
it is cooled in the case where hot liquids are being used.
In the case of large heavy pumps, for example, the V100-2, V120-2, V150-2, V151, V180 and V200 models, adequate hoisting equipment
is necessary to handle these components.
Prior to hoisting or moving them with belts or cables, ensure that the machine surfaces are protected .
Do not use water to clean the pump or its components. Should this be inevitable, dry it accurately and lubricate with oil.
12.1 Removing the cover (04)
(fig. 7)
❑
Unscrew the nuts (43). Use the two threaded holes on the cover (if present) to facilitate the removal of the cover.
❑
When removing the cover, care should be taken in order to avoid the basket from damaging (31). Should this occur, replace it. Do not use
damaged gaskets or gaskets with a thickness that is different from that of the original gasket.
❑
Slide the cover-idler assembly carefully out of the pump casing. .
Attention:
When the cover has been removed, the idler may fall off the idler pin if it is not held. This could be a potential cause of injury.
❑
If the pump is fitted with a by-pass relief valve (figure 11) on the cover, it will not be necessary to remove it. If, however, the by-pass valve
requires maintenance, loosen the screw (46) and remove it and ensure that the gasket(s) is/are not damaged (32). If the gaskets are
damaged, replace them..
❑
If the pump is fitted with a heating racket on the cover (R2), this component will separate from the pump as soon as the screws
are removed (43)(See fig. 7).
Should this occur, ensure that the gaskets are not damaged.
❑
If the cover-idler assembly does not require maintenance, go to paragraph 4.6.
12.2 Removing the idler (03)
(fig. 7)
❑
Slip the idler from the idler pin (06). The idler bush is fitted in the centre of the idler. Some versions do not have an idler bush and mount
a large diameter pin.
❑
The idler bushes can be composed of various materials. The choice of the material used depends on different factors such as the type of
application intended etc..
❑
Remove the idler bush by means of a bench press. The brush is normally press fitted.
❑
Clean the bush accurately and check the surfaces for wear. Replace the bush if it has external or localised cracks, signs of abrasion, severe
wear, deformation, external or localized blackening, rust, etc.
The tolerances and clearances of the bush depend on the version of pump used and specific application for which it is intended. It is,
therefore, not advisable to replace the bushes with others of similar dimensions or of different material composition with respect to the
original. The pump may be damaged.
Note:
The bushes play an essential role for the correct functioning of the pump. They have been designed and tested to censure perfect
contact between the idler and the idler pin and between the shaft and support.
Do not improvise alternative solutions or adjustments which tend to alter the tolerances or chemical and mechanical
characteristics.
❑
After removing the bush, the idler bush can be inspected.
❑
Clean it thoroughly and check the state of wear of the surfaces.
❑
In the case of evident traces of excessive wearing or ovalization of the hole, replace the idler.
❑
Insert the new bush using a bench press using a steady movement. For the V180 and V200 versions, heat the idler to 80
°
C and then fit
the bush. Use a lathe to bring the hole up to tolerance indicated.
12.3 Removing the idler pin (06)
(fig. 7)
❑
The idler pin is fixed to the cover. The pin should be removed only if it requires replacement or when replacing the cover. It is not necessary
to remove it to check the state of wear. The working surfaces of the idler bush sticks out completely from the cover.
❑
Remove the idler pin from its seat by means of a press.
If there are any evident signs of wear, the idler pin should be replaced. If the idler pin shows signs of overheating, this usually indicates
that the idler tends to gall. Check the idler bush and idler thoroughly.
12.4 Removing the casing (01)
(fig. 7)
❑
The casing can be removed without dismounting the pump from the basement. It will be sufficient to remove the screws from the suction
and discharge flange. If the pump mounts a jacketed casing or cover, the auxiliary heating (or cooling) liquid pipes should be removed.
❑
Remove the screws (44)
❑
Disengage the casing from the support-flange (09), paying attention not to damage the basket (30). Should this occur, replace it.
❑
The support-flange remains centred with the support.
❑
Clean the casing thoroughly and check the state of wear.
Replace if necessary.
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