Leaf Chain Inspection – Forklift Error Codes

Leaf Chain Inspection


The table below provides detailed information on the symptoms of leaf chain wear, the probable causes and the corrective measures that should be taken.

SymptomAppearanceProbable causeCorrection
Worn contourNormal wear on sheave
Abnormal wear rubbing on guides
Replace leaf chain when 5% worn
Check Leaf chain alignment or increase clearance
Worn surfaces on outer plates or pin headsMisalignment, rubbing on side flangesCheck leaf chain alignment and correct clearance as necessary
Tight jointsDirt or foreign substance packed in joints or corrosion or rust or bent pinsClean & re-lubricate leaf chain
Replace leaf chain
Missing partsMissing at original assemblyReplace leaf chain
Abnormal protrusion or turned pinsExcessive internal friction caused by high loading and inadequate lubricationReplace leaf chain, improve lubrication and eliminate overload conditions
Cracked plates (fatigue)Crack from aperture towards edge of linkplate at 90º to line of pull. Note there is no linkplate distortionLoading beyond chain’s dynamic capacity (above fatigue endurance limit)Replace chain with leaf chain of larger dynamic capacity or eliminate high load condition or dynamic (impulse) overloading
Fractured plates (tension mode)Note material distortionHigh overloadReplace leaf chain and correct cause of overload
Arc like cracked plates (stress corrosion)Severe rusting or exposure to acidic or caustic medium, plus static pressure at press fit (between pin and pin linkplate). No cyclic stress is necessary for this phenomenon to occur.Replace leaf chain and protect from hostile environment.
Enlarged holesHigh overloadReplace leaf chain and correct cause of overload
Corrosion Exposure to corrosive environmentReplace leaf chain and protect from hostile environment.
Worn leaf chain anchor bolt connecting pin Normal wearReplace worn leaf chain components and always when fitting new leaf chains

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Over 20 years of experience on all makes and models material handling equipment. Over 25 years automotive repair.

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