7. Manipulation of Chains
Possible Causes The chain and sprocket do not match. Excessive load. Elongation of the chain due to chain wear or excessively worn sprocket teeth. Improper installation of the sprocket or axle. Chain casing or bearings are loose. Excessive or insufficient slack in the chain. Excessively worn chain or sprocket. Not enough lubrication.
Symptom Chain is riding up on the sprocket.
Remedy Replace the chain or sprocket with the correct size.
Decrease the load, or increase the number of strands or size of the chain. Replace with new chain and sprockets.
Inspect and correct.
Unusual noises.
Tighten all bolts and nuts.
Adjust the distance between axles to obtain the proper amount of slack. Replace the chain and sprocket with new chain and sprocket. Provide proper lubrication according to the operating conditions. Change the chain’s mode of vibration. 1. Preventing resonance. a.To change the natural frequency of the chain. •Alter the effective tension either by applying an initial tension or adjusting the existing one. • Install a tensioner to change the chain span. • Replace the chain. Choose a different quality and spring coefficient.
Chain is resonating with a periodic external force.
Excessive vibrations in chain.
b. Change the vibration frequency. • Change the speed of rotation of the sprocket. • Re-evaluate the device set-up. 2. Mechanically reducing the vibrations.
Chain Guide
• Install a guide shoe. • Install a self-adjusting tensioner on the slack side.
Chain Tensioner
Load fluctuations are excessively large.
Reduce fluctuations with fluid coupling or similar technique.
Install an idler.
The chain winds onto the sprocket (poor separation from the sprocket teeth).
Span between axles is too large.
Adjust the chain length or distance between axles. Install a tensioner.
Excessive slack in chain.
Replace with new chain and sprocket.
Elongation of the chain due to chain wear or excessively worn sprocket teeth. Improper lubrication or poor environment. Improper installation.
Replace chain and protect it from the environment with chain casing or proper lubrication. Correct sprocket and axle installation.
Rusting of the chain.
Excessive wear at the inside surface of link plates and sides of sprocket teeth.
Check the condition of the guides, and increase the gap between the guides and chain.
Excessive wear at the link plate side surfaces and pin heads.
Improper installation of guides, etc.
Figure 7.14 (i) Troubleshooting Chain Symptoms and Remedies Transmission Chain, Small Conveyor Chain
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