TL;DR
Belt slip is usually insufficient tension or worn lagging on the drive pulley. Tension the belt first, then inspect the pulley lagging. Glazed or missing lagging cannot be fixed by tensioning alone.
What you might see
- belt slipping under load
- burning rubber smell at drive pulley
- belt speed lagging behind motor speed
- squealing at the drive pulley
Likely causes
Belt tension below minimum, allowing the drive pulley to slip under load torque
Worn or glazed lagging on the drive pulley reducing the coefficient of friction
Belt elongation over time causing effective tension loss
Drive pulley contaminated with oil or water dropping traction
Required tools
- Wrench set (take-up bolts)
- Cleaning solvent (for pulley contamination)
- LOTO kit
- Tape measure (for sag check)
Safety first
- Lock out the drive before tensioning. A slipping belt can grab and pull a hand under the pulley.
- Do not over-tension the belt. Excessive tension overloads the bearings and shortens belt life.
Procedure
- 1
Lock out the drive motor.
- 2
Inspect the drive pulley lagging. Glazed, smooth, or missing lagging cannot generate adequate traction regardless of belt tension. Replace the lagging if worn.[1]
- 3
If lagging is acceptable, tighten the take-up bolts on both sides equally by one-quarter turn to increase belt tension.[1]
- 4
Run the conveyor under normal load and observe for slip. Add tension in quarter-turn increments until slip stops.
- 5
Check belt sag between idlers. Correct tension produces roughly 1% of idler pitch as sag for a horizontal belt. Over-tensioning shortens belt life and overloads bearings.
- 6
Clean the drive pulley surface if oil or water contamination is present. Identify and fix the contamination source.
Sources
Hytrol EZLogic Accumulation Conveyor Service Manual, Hytrol Conveyor Company
Hytrol EZLogic Conveyor IOM, belt tensioning and lagging inspection procedures (general)
View source
More guides for Hytrol EZLogic
How to fix belt tracking issues on a Hytrol EZLogic conveyor
Belt tracking problems start at the tail pulley. Adjust the tail pulley's take-up bolts to center the belt, making small incremental adjustments one side at a time.
How to fix motor overheating on a Hytrol EZLogic conveyor
Motor overheating is usually a mechanical overload from seized rollers or excess belt tension. Walk the conveyor to find the drag source before suspecting the motor itself.
How to fix excessive vibration on a Hytrol EZLogic conveyor
Vibration on a belt conveyor is almost always an unbalanced or dirty roller or pulley. Walk the conveyor slowly to locate the vibration source, then clean or replace the offending component.
How to diagnose intermittent stops on a Hytrol EZLogic conveyor
Intermittent stops on EZLogic conveyors are most often a dirty or misaligned photoelectric zone sensor triggering a false jam signal. Clean the sensor lenses and verify alignment.
Stop fixing the same fault twice.
Dovient turns guides like this into your team's shared playbook, with AI that catches recurring issues before they break the line.