When the engagement between chain and sprockets becomes defective or any element that triggers extreme decline inside the power in the chain takes place, change the whole chain. When any from the following circumstances occur inside the chain you employ, exchange the whole chain to keep security.
Whenever a chain is worn close to the “Elongation limit of chain” .
?When a flaw or crack takes place in the plate.
?Whenever a flaw or crack or defective rotation of a roller is observed.
?When a chain hyperlink is stiff.
?Whenever a pin is rotated.
?Whenever a pin is bent or otherwise deformed or when a plate is seriously warped.
?When rust buildup prevents smooth bending of the chain.
?When diluted sulfuric acid or every other corrosive materials is deposited.
In case you can not judge no matter whether a flaw is “harmful”, please seek the advice of us.
Replacement of sprockets and how to buy
The lifestyle of sprockets is generally numerous occasions the existence of a chain, but when the teeth are worn since of insufficient lubrication or broken due to the fact of a shock load, and so forth., the sprockets have to 
be replaced.
?When placing an buy, please specify the next in case the chain No. is identified.
1. Chain No. and number of strands
two. Type of sprockets
3. Shaft hole diameter (d) (This really is not needed in the event you drill this hole; in this instance, drill a hole not exceeding the maximum shaft hole diameter.)
4. Number of teeth
five. Hub diameter (DH) and length (L) (while in the situation of non-standard sprockets)
6. Whether the tooth heads are hardened
Specify the next objects, when the chain No. is unknown
one. Tooth thickness (T)
2. Root diameter (DB) (Caliper diameter (DC) within the case of odd-number teeth)