Crusher Troubleshooting: Causes & Fixes

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Problems on this page:

Reduced throughput or wrong product size Blockage or bridging Liner wear or tramp metal damage Bearings or oil overheating Setting drifting on a cone crusher Excessive dust Drive belts slipping Too many fines in the product Uneven liner wear Excessive vibration

Reduced throughput or wrong product size

Hits OEE: Performance

Symptoms: Lower output, oversize product, fines out of spec.

Worn liners/jaws or wrong setting

Adjust the closed-side setting; replace worn liners/jaws.

Uneven or choke-feed issue

Maintain correct feed; avoid trickle or surging.

Material harder/wetter than design

Verify feed; adjust the process.

Prevention: Liner/setting management, correct feeding, feed control.

Blockage or bridging

Hits OEE: Availability

Symptoms: Material bridges the inlet, chokes, crusher stalls.

Oversize feed or bridging

Control top size; use a grizzly/scalper upstream.

Wet or sticky material

Manage moisture; clear and prevent build-up.

Discharge blocked

Check the discharge conveyor and chute.

Prevention: Feed-size control, moisture management, discharge checks.

Liner wear or tramp metal damage

Hits OEE: Availability

Symptoms: Rapid liner wear, tramp-metal trips, damage, stops.

Tramp metal in the feed

Add metal detection/magnets; protect with a relief system.

Abrasive material or wrong liner

Use correct liner alloy; plan wear changes.

Overload protection trips

Investigate before reset; clear the cause.

Prevention: Tramp-metal protection, correct liners, overload management.

Bearings or oil overheating

Hits OEE: Availability

Symptoms: Oil or bearing temperature alarms and trips.

Oil flow low or cooler fouled

Check the lube pump, filters and cooler.

Contaminated oil

Change the oil and check the seals.

Bearing wear

Inspect the bearings.

Prevention: Oil analysis on a schedule.

Setting drifting on a cone crusher

Hits OEE: Quality

Symptoms: Product size grows during the shift.

Hydraulic leak

Find and fix the leak.

Accumulator pre-charge low

Check the pre-charge.

Relief opening often

Check for tramp metal and overload.

Prevention: Setting checked each shift.

Excessive dust

Hits OEE: Quality

Symptoms: Dust clouds at the crusher and transfers.

Dust sprays off or blocked

Check the sprays.

Extraction weak

Check the extraction.

Enclosure open

Close the enclosure.

Prevention: Dust controls checked on start-up.

Drive belts slipping

Hits OEE: Availability

Symptoms: Squeal, smell of rubber, speed drop under load.

Tension low

Set belt tension.

Worn belts

Replace as a set.

Overload

Check feed rate.

Prevention: Belt checks weekly.

Too many fines in the product

Hits OEE: Quality

Symptoms: More fine material than the product needs.

Setting too tight

Open the setting.

Fines in the feed not removed

Scalp the fines before the crusher.

Liner profile wrong for the duty

Choose a liner for the product.

Prevention: Product gradings checked each shift.

Uneven liner wear

Hits OEE: Quality

Symptoms: Liners wear faster on one side, product size drifts, and liner life shortens.

Feed landing off-centre

Centre the feed with a distributor or a chute change.

Feed segregated, with fines on one side

Mix the feed before the crusher.

Liner profile not suited to the feed

Choose a liner profile for the feed size.

Crusher run below choke feed

Keep the chamber full where the crusher type needs it.

Prevention: Liner wear measured at planned intervals.

Excessive vibration

Hits OEE: Availability

Symptoms: The crusher shakes its structure, bolts loosen, cracks appear.

Flywheel or counterweight out of balance

Check the balance after any change.

Loose foundation bolts

Tighten the bolts to the specified torque.

Worn bearings

Check the bearings.

Tramp material in the chamber

Stop and clear the chamber safely.

Prevention: Vibration readings on the route.

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

Related equipment guides: filter press · decanter centrifuge · mixer agitator · homogeniser · belt weigher · hammer mill

Stop the same fault coming back

Recurring crusher 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.

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