Xerox Phaser 8400 Service Manual page 278

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Bent or missing gear teeth; check especially where a metal gear drives a
plastic gear.
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Fractured or cracked gears (Oil or incorrect grease on a plastic gear can
cause the gear to crack.)
Belts: There are 3 rubber belts in the printer. Inspect the belts for wear.
Look for these problems:
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Loose rubber particles below the belts indicate a worn belt
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Missing teeth in the belts
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Cracking or moderate fraying; a small amount of fraying is inevitable, so
look for other signs of wear before replacing the belt.
Cleaning and Maintenance 7-7