Palletizer Troubleshooting: Causes & Fixes

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Problems on this page:

Pattern faults / frequent jams Dropped or mis-placed product Pallet or infeed feed fault Unstable or leaning loads Slip sheet or tier sheet faults Frequent safety stops in the cell Cases turned the wrong way before layering Hoist or layer table position faults

Pattern faults / frequent jams

Hits OEE: Performance

Symptoms: Misformed layers, toppled product, stops at the layer/row former.

Infeed orientation/spacing wrong

Check row-former and turning devices; correct spacing.

Worn/misadjusted guides or grippers

Inspect and reset change parts for the pattern/SKU.

Product or pallet variation

Tighten incoming pallet/product spec; re-teach the pattern.

Prevention: Pattern setup sheets, change-part inspection, pallet/product QA.

Dropped or mis-placed product

Hits OEE: Quality

Symptoms: Cases dropped or placed off-pattern, unstable stacks.

Gripper or vacuum fault

Check grip force/vacuum and cups; replace worn parts.

Taught position drift

Re-teach place positions; check for mechanical knocks.

Product or case variation

Tighten incoming case spec; adjust handling.

Prevention: Gripper maintenance, position checks, case QA.

Pallet or infeed feed fault

Hits OEE: Availability

Symptoms: No pallet present, pallet jams, or infeed starves and backs up.

Pallet dispenser jam

Clear the magazine; remove damaged pallets.

Infeed sensor or conveyor fault

Check infeed sensors and the conveyor drive.

Poor pallet quality

Reject broken or wet pallets; tighten supplier spec.

Prevention: Dispenser maintenance, sensor checks, pallet quality control.

Unstable or leaning loads

Hits OEE: Quality

Symptoms: Stacks lean, layers shift in transport, wrapped loads tilt.

Pattern not interlocked for the case size

Use an interlocking pattern and check it against the real case size.

Cases out of spec or too weak

Check incoming case dimensions and strength with the case supplier.

Layer not squared before it is placed

Adjust the squaring or compression station.

Damaged or wrong pallets

Inspect pallets and reject broken boards.

Prevention: A load check on every new pattern and pallet inspection at receiving.

Slip sheet or tier sheet faults

Hits OEE: Availability

Symptoms: Sheet not placed, two sheets at once, or sheets placed crooked.

Worn or leaking vacuum cups

Replace the cups and check vacuum.

Sheets stuck together or curled

Store sheets flat and dry, and fan or separate them before loading.

Dirty or misaligned magazine sensor

Clean and align the sensor.

Prevention: Vacuum checks and dry sheet storage.

Frequent safety stops in the cell

Hits OEE: Availability

Symptoms: The cell stops whenever someone enters to bring pallets or sheets; nuisance light-curtain trips.

Replenishment needs entry into the guarded cell

Move pallet and sheet loading outside the guarded area and size the magazines for a full run.

Light curtain dirty or misaligned

Clean and align the light curtain and check its muting sensors.

Muting set wrong for loads leaving

Set muting timing to the OEM guidance.

Prevention: Standard work for replenishment so nobody needs to enter while the cell runs.

Cases turned the wrong way before layering

Hits OEE: Performance

Symptoms: Cases arrive with the label facing in or the wrong way round, pattern rejects.

Turning device timing or height wrong

Set the turner or bumper for the case size.

Cases slipping on the conveyor

Adjust conveyor speed and clean the belts.

Case dimensions vary

Check incoming case dimensions.

Prevention: Turner settings on the format sheet and checked at changeover.

Hoist or layer table position faults

Hits OEE: Availability

Symptoms: Layers placed at the wrong height, hoist stops, position alarms.

Dirty or loose position encoder

Clean the encoder and check its coupling.

Stretched hoist chains or belts

Check and tension the hoist chains or belts and replace worn ones.

Worn motor brake

Inspect the hoist motor brake.

Prevention: Hoist chain and brake checks on a schedule.

Guidance only. Always follow lockout/tagout and your site's safe-work procedures, and verify against OEM manuals before acting.

Stop the same fault coming back

Recurring palletizer stops usually trace to a cause you cannot see by hand. The partner we recommend is Fabrico: it tracks OEE and downtime live from PLCs, IoT sensors or AI cameras; where cameras are fitted, the video of a stop sits next to its machine data so the cause can be reviewed; and a technician opens the work order from the stop in the same system. Data is hosted in the AWS EU region, and Fabrico and the company behind it hold ISO/IEC 27001, ISO/IEC 20000-1 and ISO 9001.

Book a Fabrico demo

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Methods that cut recurring stops: the six big losses · root cause analysis · preventive vs predictive maintenance · TPM · SMED & changeover