SKF TKBA 40 Mode D'emploi page 14

Step 3. Elimination of parallel misalignment
Move one of the pulleys on its shaft until the laser line exactly matches the
three reference lines (as per figure 15).
Fig 13 Pulleys with parallel misalignment Fig 14 Parallel alignment
The pulleys are now successfully aligned.
Fig 15 Pulleys perfectly aligned
Note:
When tightening the belt, check the horizontal angle alignment and adjust
if necessary.
Warning:
Switch OFF the laser unit and remove both units BEFORE starting machinery
12 SKF TKBA 40