|Elevator does not run
||No electrical power supplied to the prefeeder.
||Verify the electric supply to the elevator
|A belt is blocked or locked by jam
||Look for jammed product between the belt and the sidewall of the prefeeder, and manually check belt for movement
|Upper pulley is spinning but the elevating belt not moving
||Lower pulley (set screw) came loose.
||Check lower pulley set screw; install any missing hardware, tighten set screw
|Bottom roller not turning
||Loosen belt tension, manually rotate bottom roller to check bearings; replace bearings if roller doesn’t move
|Belt too tight
||Loosen the tension on the belt
|Elevator belt moving to one side, rubbing against the guides
||Belt is not aligned properly.
||Adjust belt alignment at the lower pulley, loosen and adjust the nut on the lower shaft
|Product jammed in between belt and guide
||Clear any product that might be jammed between the belt and the guides
|Parts falling behind the belt and jamming in the lower pulley and roller
||Prefeeder is set too steep.
||Using a level, check the hopper to see if it is level; it should be parallel to the floor. If the hopper is not level the prefeeder is too steep. Adjust the prefeeder angle to bring the hopper to a level position.
|Parts don’t exit the prefeeder hopper
||Parts are bridging in the hopper.
||It may be necessary to purchase a hopper agitator to assist with the complete product cycling. Part tolerances change with product runs and could act differently and require additional help