Schwinn S.C. 7 Service Manual page 12

Crank Arm Replacement
1. Remove the rubber chainguard cap.
2. Remove the screws from the user right chainguard (inset).
3. Use a Phillips screw driver and 5mm hex key to remove the
screws securing the user left Chainguard to the bike.
4. Rotate the chainguard downward to remove
5. Use a 13mm open-ended wrench to loosen the belt idler
tension spring.
6. Pull up on the idler arm while walking the belt out from
under it.
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