30
Operation & maintenance manual, Drum filter HDF 12/16/20/24 -series
8.5.3 Adjusting drive chain tension
1. Stop the filter (turn the main power switch to the
OFF (0) position and lock it with a padlock).
2. Loosen the four nuts that hold the worm gear in
place (see (1) in Figure 8.9/ Figure 8.10).
3. Loosen the two nuts (2) that lock the adjustment
screws (3).
4. Adjust the two screws (3) so that the correct
chain tension is attained (see section 8.5.2 Check-
ing drive chain tension). So that the worm gear can
be kept horizontal, the two screws should be adju-
sted one at a time and a little at a time. Use a spirit
level to ensure that the worm gear is actually in
the horizontally balanced position.
5. Tighten the four nuts (1).
6. Tighten the two nuts (2).
7. Start operation again as in section 6.1 (Check
measures for restart).
When the drive chain can no longer be adjusted, the chain is worn out and must be replaced.
Figure 8.9 Gearbox, filter with stand
A. Nuts (4)
B. Lock nuts (4)
C. Adjustment screws (2)
Figure 8.10 Gearbox, filter with tank
