TROUBLESHOOTING GUIDE
Problem
Possible Causes
What to Do
• Realign sprockets and shafts • Tighten set-bolts • Adjust centers or idler take-up • Replace chain and/or sprocket • Lubricate properly • Check chain drive selection
• Misalignment of sprockets • Loose casings or bearings • Too little or too much slack • Chain and/or sprocket wear • Inadequate lubrication or no lubrication • Chain pitch size too large
Excessive Noise
• Resonance to the vibration cycle of machine to be installed • High load fluctuation
• Change vibration cycle of chain or machine
Chain Vibration
• Use torque converter or fluid coupling
• Misalignment
• Realign sprockets and shafts
Wear on inside of link plate and one side of sprocket teeth
• Replace chain • Adjust centers or idler take-up • Reduce load or install stronger chain
• Excessive chain wear • Excessive chain slack • Heavy overload
Chain climbs sprockets
• Reduce shock (e.g., install a shock absorber) • Install a device to absorb vibration (e.g., tensioner idler wheel) • Chain section should be checked (increase number of strands or select next larger size chain) • Realign sprockets and shafts • Lubricate properly • Replace with anti-corrosive chain • Reduce load or replace with chain of suitable strength • Shield drive from foreign matter • Check for chain interference • Adjust the center distance or install idler take-up • Same as above • Replace chain • Reduce shock load or install stronger chain • Remove material build-up or install side gashed sprockets • Lubricate properly • Install anti-corrosive chain or sprockets • Use shorter pitch chain or install larger diameter sprockets
• Chain speed too high for pitch and sprocket size
Broken pins, bushings or rollers
• Heavy shock or suddenly applied loads • Material build-up in sprocket tooth pockets
• Inadequate lubrication • Chain or sprocket corrosion
Chain clings to sprocket
• Center distance too big or high load fluctuation • Excessive chain slack • Excessive chain wear
Chain gets stiff
• Misalignment • Inadequate lubrication • Corrosion • Excessive load
• Material build-up in chain joint • Peening of link plate edges
Breakage of link plate
• Subjected to shock load • Vibration
• Moment of load inertia is too big
A-78
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