VARISCO DUO JD, Instructions For The Use And Maintenance

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- Where necessary, replace the gasket (43 Fig. 11).
- To reassemble, repeat the procedure in reverse.
- Make sure the impeller is positioned accurately with respect to the wear plate, as indicated in section 10.5.
10.3 REPLACING WEAR PLATES
To replace wear plates, you must:
FRONT
- Drain the pump casing by means of the relevant drain cover (1 Fig. 3).
- Unscrew the nuts (52 Fig. 11) and remove the pump casing, being careful not to damage the gasket (43 Fig. 11).
- Unscrew the Allen screws (57 Fig. 11);
- Remove and replace the wear plate (02 Fig. 11).
- Where necessary, replace the gasket (43 Fig. 11).
- To reassemble, repeat the procedure in reverse.
- Make sure the impeller is positioned accurately with respect to the wear plate, as indicated in section 10.5.
REAR
- Drain the pump casing by means of the relevant drain cover (1 Fig. 3).
- Remove the impeller (03 Fig. 11) as described in section 10.2.
- Unscrew the screws (57.1 Fig. 11) securing the head (19 Fig. 11).
- Replace the plate (02.1 Fig. 11).
- To reassemble, repeat the procedure in reverse.
10.4 REPLACING THE SEAL
- Drain the pump casing by means of the relevant drain cover (1 Fig. 3).
- Unscrew the nuts (52 Fig. 11) and remove the pump casing, being careful not to damage the gasket (43 Fig. 11).
- Prevent the impeller (03 Fig. 11) from turning and remove the self-locking nut (33 Fig. 11).
- Remove the impeller.
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automatically with it.
- Slip the seal’s stationary seal (39 Fig. 11), with the relevant gasket (38 Fig. 11), off the head.
- Remove the lip seal (41 Fig. 11).
- Wash the head with solvent to remove any old grease residues and clean the seats of the lip seal and stationary seal
thoroughly.
- Fit a new lip seal on the head. To make assembly easier, oil the seat and lip seal.
- Fit the stationary seal (39 Fig. 11) complete with gasket (38 Fig. 11). To make the operation easier, wet the seat and gasket
with alcohol. If necessary, use a wooden plunger or similar tool to push the stationary seal (39 Fig. 11) into its seat.
- Secure the head with the screws (45 and 45.1 Fig. 11).
- Smear the seal (40 Fig. 11) and shaft sleeve (31 Fig. 11) with oil and slip the seal onto one end of the shaft sleeve.
- Slip the sleeve and seal onto the shaft and push to overcome the slight resistance offered by the lip seal. Be careful the seal
does not slip off the shaft sleeve.
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- Make sure the impeller is positioned accurately with respect to the wear plate, as indicated in section 10.5.
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- Fill the seal’s lubrication chamber (see sect. 9.2) with oil or grease.
10.5 IMPELLER POSITIONING WITH RESPECT TO WEAR PLATE(S)
In all models, the distance between the tip of the impeller blades and surface of the wear plate must be in the range 0.3 - 0.6 mm
(Fig. 15).
For this to happen, distances A and B in Figures 13 and 14, must be as near to each other as possible. To achieve this result,
use the shims (25.2 Fig. 11) supplied with the spare seal. Said rings serve to position the impeller further forward if it is too far
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Fig. 11) and the impeller.
Other adjustments can be made with the casing gaskets and rear plate. The required distance (Fig. 15) can be achieved by
inserting the 0.5mm-thick gasket (43 Fig. 11).
10.6 MAINTENANCE OF «SLOT GREASE» LUBRICATOR
If the unit features the SLOT GREASE automatic lubrication system, the only operation you need to perform is to check its
lubricant level.
If it needs topping up, proceed as follows:
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SLOT GREASE is an automatic lubrication system that delivers a constant amount of grease. While it is in use, simply check at
regular intervals to make sure the lubricator is screwed in properly. the lubricator is screwed in properly.
INSTRUCTIONS FOR THE USE AND MAINTENANCE - DUO JD