Basics
Symptom Improper flex or bending of chain, tight joints.
Remedy Inspect the installation and correct as necessary.
Possible Causes Chain is not installed correctly.
Remove the chain, wash it thoroughly, and provide proper lubrication.
Contamination from metal dust or dirt because of improper lubrication.
Reduce the load or increase the number of or size of chains. Replace chain with a larger size.
Excessive load or bent pin.
Install a chain casing to protect the chain.
Corrosion or rusting.
Provide proper lubrication according to the operating conditions.
Seizing from improper lubrication.
Provide the proper operating conditions.
Seizing of pin and bushing. Pin and bushing seized from high-speed operation. This causes improper bending and can lead to chain breakage.
Replace with new chain and correct installation.
Spreading of link plates.
Uneven or excessive loading caused by improper installation.
Figure 7.14 (i) Transmission Chain, Small Conveyor Chain (Cont.)
Remedy
Symptom
Possible Causes
Reduce shock loads by making the start-up, stopping, and other actions smoother (installing a shock absorber, etc.). Increase the size or number of chains. Install an anti-vibration device (for example, tensioner or idler). Refer to “Excessive vibration in chain.”
Breakage of link plate.
Excessively large shock load.
Vibrations in the chain.
Large inertia in the driven machine (excessive load).
Increase the size or number of chains.
Corrosion.
Replace with a new chain. Install a casing to protect the chain. Otherwise, periodically clean the chain.
Figure 7.14 (ii) Link Plate
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