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CHANGING THE PRE-STRETCH
1. Disconnect power to machine. Carry out lock out tag out procedure.
2. Remove carriage cover.
3. Loosen idler sprocket using appropriate wrench.
4. Remove the chain or the belt (located between A and B sprockets)
5. Remove A and B sprockets by loosening the set screws. If necessary, use a puller.
6. Using the pre-stretch chart in the manual, select desired pre-stretch and find appropriate pulley kit (pulley,
belt/chain) for the selected pre-stretch.
7. Install A and B sprockets according to drawing (use a rubber hammer to set in place)
8. Tighten set screws.
9. Reinstall belt/chain between pulleys.
10. Adjust idler sprocket then tighten it.
11. Put carriage cover back in place and fasten it.
12. Return power to machine and test pre-stretch.