The Jaw Crusher is the preferred primary‑crushing equipment widely used in quarries, mines, construction waste recycling and aggregate production lines. Long‑term heavy‑load operation will inevitably bring various malfunctions. Timely fault diagnosis and proper troubleshooting can effectively reduce downtime, extend equipment service life and ensure the stable operation of your whole crushing‑screening plant.

Fault 1: Sudden Shutdown of the Machine (Stuck‑up Failure)

Causes: Excessive feeding volume, over‑large raw ore blocks, wet and sticky materials blocking the crushing cavity, jamming of unbreakable metal objects, failure of downstream conveying equipment.

Solutions: Cut off the power supply immediately and stop feeding materials. Clean all trapped stones and impurities inside the crushing chamber. Check and remove hard foreign objects. Inspect the conveyor belt and related driving parts. After full cleaning, manually turn the flywheel to confirm free movement of the movable jaw before restarting production. Optimize feeding speed and install pre‑screening equipment to prevent over‑size materials from entering.

Fault 2: Abnormal Vibration and Loud Noise During Operation

Causes: Loose foundation anchor bolts, worn toggle plate, damaged bearing, uneven wear of jaw plates, eccentric feeding, unbalanced rotor.

Solutions: Shut down the machine and fasten all loose bolts. Check the wear degree of toggle plate and bearing components, replace severely damaged spare parts. Adjust the feeding system to make raw materials fall into the center of crushing cavity. Change deformed jaw liners to guarantee balanced crushing force.

Fault 3: Finished Particle Size Becomes Coarser and Unqualified

Causes: Jaw plates are heavily worn, the discharge gap is enlarged without notice, toggle plate and supporting seat are worn out.

Solutions: Measure the discharge opening regularly. Adjust the gap to the required size. Inspect jaw plates, replace worn‑out liners in time. Check toggle‑plate assembly and repair worn supporting seats, so as to restore normal crushing clearance.

Fault 4: High Temperature of Bearing and Over‑heating Phenomenon

Causes: Insufficient or deteriorated lubricating oil, oil pipeline blockage, bearing seal failure, long‑time overload operation.

Solutions: Stop the crusher and check the lubrication system. Add or replace qualified lubricant. Clean blocked oil pipes. Examine sealing parts and replace damaged seals. Avoid continuous over‑load feeding and arrange periodic rest for the equipment.

Fault 5: Flywheel Rotates but the Movable Jaw Stops Working

Causes: Fracture of toggle plate, failure of tension spring and tie‑rod assembly.

Solutions: Immediately stop production. Replace the broken toggle plate. Inspect tie‑rod, spring and related connecting components, reinstall and adjust spring tension to restore normal connection.

Daily Preventive Maintenance Suggestions

Carry out comprehensive inspection before startup every day. Check lubrication condition, fastener tightness and wear‑part status. Operate the jaw crusher in strict accordance with operation manuals. Arrange regular overhaul plans, replace vulnerable parts in advance, which can greatly lower the occurrence rate of common faults.

Reliable Jaw‑Crusher Equipment and Technical Support

Many breakdown risks can be avoided fundamentally by purchasing high‑quality machinery. If you are searching for durable primary crushing equipment, select a trustworthy Jaw Crusher factory — Shanghai Dongmeng. We provide high‑performance jaw crushers, detailed operation‑maintenance manuals, on‑site installation‑commissioning service and global after‑sales technical support, helping your crushing‑line cut fault‑related losses and gain long‑term production benefits.

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