IAI America FS - Manual (Page 45)

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8) Loosen the pulley fixing screws on the driving belt side.
(Use a hexagon wrench with the distance to the opposite side of 4mm.)
9) Remove the deceleration belt to make the pulley free.
10) Detach the driving belt retainer plate.
(Use M4-sized hex wrench for NM. Use M5-sized hex wrench for WM.)
Deceleration Belt