| Symptom |
Possible Cause |
Solution |
| 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 |
