How to solve conveyor belt runs to one side at given point on structure?

Cause: Buildup of material on idlers
Solutions: Remove accumulation; improve maintenance; install scrapers or other cleaning devices.

Cause: Sticking idlers
Solutions: Free idlers and improve maintenance and lubrication.

Cause: Idlers or pulleys out-of-square with center line of belt.
Solutions: Readjust idlers in affected area.

Cause: Conveyor frame or structure crooked.
Solutions: Straighten in affected area.

Cause: Idler stands not centered on belt.
Solutions: Readjust idlers in affected area.

Cause: Structure not level.
Solutions: Level structure in affected area.