SF-RB4616: How to Remove, Replace, and Adjust the Belt
STEP 1: Remove the screws (Part 17 and 18) from the covers on both sides.
STEP 2: Using the Spanner, remove the left pedal (Part 60L) from the crank arm (Part 39).
(Note: The left pedal is reverse threaded. To remove the pedal, rotate the pedal bolt CLOCKWISE.)
STEP 2A: Repeat the process with the right pedal (Part 60R), however, the pedal bolt needs to go COUNTER-CLOCKWISE in order to remove it.
STEP 3: Remove the covers on both sides.
STEP 4: To remove the belt (Part 62), place your index and middle fingers on the belt. Then turn the belt wheel (Part 55) and pull the belt towards you where the belt meets the belt wheel. Once the belt passes a couple of grooves the belt may be removed from the belt wheel.
STEP 5: When putting on the replacement belt, make sure the belt goes on top of the pulley, then under the belt wheel. Once the belt has been placed on the belt wheel, you will need to turn the crank arm while guiding the belt onto the grooves.
STEP 6: When adjusting the belt, make sure that the belt is close to the inner part of the pulley (Part 71) as possible.
STEP 7: Reinstall All Components
For more information, please see the video below.