Prefeeder Troubleshooting
Field Service
Prefeeder Troubleshooting
| Symptom | Possible Cause | Solution |
|---|---|---|
| Bowl does not turn | Part Jammed in Feeder | Verify the electric supply to the elevator |
| Part Jammed in Feeder Air clutch is not engaged (Scallop style feed only) | Check air supply; check MAC valve operation. | |
| Bowl and disc turn; but parts jam | Bowl or prefeeder speed incorrect Incorrect part | Check settings. Correctly set bowl and prefeeder speeds. |
| Incorrect part | Check changeover settings. Verify the feeder is set up for the part to be run. | |
| Tooling or air jets need adjustment | Check air jet positioning, and refer to your direct supplier’s “As-Built Tooling Documentation” | |
| Bowl does not turn | Part Jammed in Feeder | Verify the electric supply to the elevator |
| Bowl does not turn | Part Jammed in Feeder | Verify the electric supply to the elevator |
| Bowl does not turn | Part Jammed in Feeder | Verify the electric supply to the elevator |
| Air clutch is not engaged (Scallop style feed only) | Check air supply; check MAC valve operation. |
| 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 |
* The leveling foot has a vertical adjustment of ±1.75”, allowing for a height variation between 1.00” and 4.50”. This may alter the discharge height.
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