Troubleshooting for roller chain and applications

Troubleshooting for roller chain and applications




Chain climbing or jumping off the sprocket teeth Chain or sprockets worn

Replace the chain and sprockets if necessary

Chain excessively slack

Adjust the center distance or introduce a jockey sprocket to take up the slack. If allowable, shorten the chain

Insufficient chain wrap

For large raito drives the driver sprocket may not have enough teeth to absorb the working tension. If the drive cannot be altered, introduce a jockey sprocket to increase the chain wrap

Foreign material build up in the sprockets tooth gaps

Clean the sprocket teeth of all material so that the chain engages correctly

Chain Drive Running Hot

Lubrication method or type of lubrication is unsuitable for the operating speed and power being transmitted

Check the catalogue selection tables for the correct lubrication method

Insufficient lubrication

Increase the frequency of lubrication in line with good maintenance practice

Chain continually hitting an obstruction

Remove the obstruction

Incorrect chain size selected for the speed and transmitted power

Check the chain selection as a smaller pitch or multistrand chain of equivalent capacity may be required

Chain elongation (A gradual increase over its life is normal)

Lubrication failure Replace chain and sprockets
An overload Check lubrication, drive configuration and loadings
Displacement of the bearings Monitor drive elongation over a period of 2-3 months by checking the degree of sag
Failure of the tensioning device Contact our technical staff for advice if problem persists

Chain stiffens, starts to whip

Worn chain or sprockets Replace chain and sprockets
Excessively slack chain Adjust centres if possible or introduce a take-up system such as a jockey sprocket. it is also possible to shorten the chain by one or more pitches
Heavy & impulsive load Reduce the loading
Centre distance too long Add a jockey sprocket on long centre distances
One or more stiff joints

Remove or repair stiff joints

Excessive noise

Misalignment of sprockets

Misalignment introduces abnormal loading and wear. Recheck alignment to maintain normal drive conditions
Inadequate lubrication Improve the lubrication method to ensure the proper amount of lubrication is available in the bearing areas

Worn or incorrectly fitted bearings

Replace or correct the bearings as these will malign the entire drive

Chain excessively slack or tight

Adjust the centre distance if possible or introduce a jockey sprocket

Worn chain or sprockets

Replace the chain and where necessary the sprockets. Consider hardened teeth
Tight joints Replace or repair joints
Heavy impulsive loads Reduce the load or introduce a jockey sprocket
Chain pitch size too large Check the chain selection or contact our technical staff
Obstruction in the chains path Remove the obstruction

Heavy wear on sprocket Teeth working faces. (A bright polished appearance Is normal)

Poor lubrication

Improve the method of lubrication, (see lubrication section)

Presence of abrasive

Check for presence of foreign materials and eliminate the source. Replace sprockets and chain if necessary

Pin fails

System loading is greater than the capacity of the chain

Check the kilowatt rating table to determine if the chain capacity has been exceeded. Larger pitch chain or a multistrand chain may be required if the load conditions cannot be corrected

Roller or bush fails

Chain capacity has been exceeded at high speed causing impact on the sprocket teeth

Check the drive selection. A smaller pitch chain, a multistrand chain or sprockets with more teeth may be required

Tooth marks on the outside of the roller diameter can initiate failure

If the rollers are marked by the sprocket teeth, adjust the centre distance

Rust present on chain

Inadequate lubrication. This will also affect the joints which will be discoloured, (light to dark brown) and could be rough, grooved or galled

Remove several joints and check that the components are not severely damaged. Replace chain and sprockets as necessary Improve lubrication method

Side plate fails

Fatigue failure is caused by repetitively loading the chain above its limit

Check the drive selection, a larger pitch chain or a multistrand chain may be required

Impulsive drive conditions can also cause fatigue failure

If not the above, check for excessive slack. This may indicate worn chain and sprockets. Replace where required

Side plates are worn

Wear on the inside of the plate is caused by sprocket misalignment

Check and adjust sprocket and shaft alignment

Wear on the top of the side plate is caused by the chain rubbing against the chaincase or some obstruction

Remove source of rubbing by removing the obstruction or adding a jockey sprocket to control the slack in the chain

Wear on the sides of the sprocket teeth

Drive misalignment

Check and correct sprocket and shaft alignment