GBC AdvancedPunch Pro Service Manual page 216

ADJ 1.4.2 Bypass Motor- M8- belt adjustment (534T belt)
Use this procedure to adjust the Belt tension of 534T timing belt.
1. Disconnect the Power Cord.
2. Do REP 1.6 to remove the Rear Cover.
3. Loosen the the tensioner.
4. Adjust the belt tension such that there is a deflection of 6~8mm.
Repairs/Adjustments
5. Tighten the tensioner
6. Do REP 1.6 to install the Rear Cover.
7. Connect the Power Cord.
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GBC AdvancedPunch Pro