Umping chisel

Chain and sprocket do not match

Replace the chain or sprocket with a matching size

Insufficient corner wrapping

Set to a wrap angle of 3 or more teeth

Clearly overloaded

Reduce the load. (Installing buffer devices, etc.)

Insufficient backup tension

Adjustment of elasticity and tension, and setting of tensioning devices

Chain wear and elongation

Replace with a new chain

The center distance between the chain and sprocket is not 

suitable, S ≠ S'

Adjust after testing

Chain wrapped around sprocket (chain cannot detach from sprocket)

The slack of the chain is too large

Adjust the length of the chain or the distance between the axes. Or install a tensioning device

Wear of sprocket, mismatch between chain and sprocket

Replace the chain and sprocket with new ones

Make abnormal noise

Insufficient refueling for the sliding part of the pin/sleeve

Fully refuel

Insufficient oiling of sleeve/roller sliding part

Fully refuel. Using bearing rollers and plastic rollers

Get caught up in the sprocket or jump chisel

Same as above

Loose chain cover or bearing

Re tighten all bolts and nuts

Chain or running parts rub against the cover

Adjust after testing

The chain or sprocket is visibly worn

Replace the chain or sprocket. (Replace all chains in a 

series)

Poor guide rail setting

Adjust after testing

Wear on the inner side of the chain plate or the tooth side of the 

sprocket

Poor centering of the sprocket

Disassemble the chain and correct the centering of the 

drive and driven sprockets

The chain is horizontally compressed

Exclude the cause of compression. Use guide wheels

Deviation caused by poor machining accuracy of the 

sprocket shaft hole

After checking the bad position, adjust and replace it 

with a new gear

Poor bending

Chain wear

Simultaneously replace the chain and sprocket

Insufficient number of meshing teeth

Increase the number of teeth

Use BF chain (without rollers)

Replace with RF chain. (with rollers)

Insufficient hardness of teeth due to wear inclusions or 

excessive load

Gear top quenching or use interchangeable chisel 

specification sprockets

Chain wheel and chain do not match

Replace the chain or sprocket with a matching size

Rust and corrosion

Separate to protect the chain. Choose appropriate 

specifications (such as MT)

The conveyed material adheres between the pin, sleeve, 

and chain plate. Or there may be foreign objects entering

Separate to protect the chain. Choose specifications with 

larger gaps between pins, sleeves, and chain plates

Chain deformation caused by poor installation

Check the installation status of the sprocket and shaft 

and adjust them

Insufficient refueling

Consider using fuel or wear-resistant specifications

Used in high temperature (above 400 ℃) environments

Use chains with appropriate gaps

Heating and solid burning due to overload

Regularly refuel

Due to obvious overload causing the pin to bend

Reduce the load

Chain jamming and slipping (crawling phenomenon)

The crawling phenomenon occurs due to a combination of multiple 

reasons, so sometimes even with the coping methods described on 

the right, it may not be possible to avoid its occurrence

Changed the rolling friction coefficient of the chain

Clean and lubricate movable parts. Replace the sprocket 

with a new one. Replace with bearing roller chains

Slow speed

Increase speed

The rigidity of the frame is insufficient, and the chain is 

smaller compared to the mechanical one

Improve the rigidity of the framework and increase the 

size of the chains. Reduce the looseness of the roller 

chain used for driving

Increased friction force

Add oil between the guide rail and the chain to reduce 

friction. Replace with bearing roller chains

Captain is too long

Decompose the conveyor and shorten the length of the 

machine

Polygonal motion causes shaking

Set the number of teeth on the drive sprocket to 12T or 

more. Or strengthen the sprocket

Unilateral wear of the inner links and pins of NF block chains and BF 

chains (without rollers)

Internal tension increases when meshing with the sprocket

Use parts that reduce internal tension on the sprocket. 

Reduce the load. Lubricate both the chain and sprocket

Chain rusting

Selected unsuitable materials

Replace the chain. Protect the environment. Apply anti 

rust oil. (Refueling and covering)

Condensation

Eliminate the temperature difference inside and outside 

the conveyor. (Insulation

 materials, etc.)

Wear and tear caused by the conveyed material

Transported materials with high wear and tear, such as 

orepowder, adhere and can leave scratches on the surface 

of the chain

Ensure that the conveyed material does not come into 

contact with the chain. Make the chain into 

wear-resistant specifications

Wear caused by corrosion

Corrosion caused by contact with acidic or alkaline liquids, 

coupled with mechanical wear, accelerates wear

Use corrosion-resistant materials that are not invaded by 

chemical reagents. Use wear-resistant materials on 

components that experience mechanical wear

Electrochemical corrosion

When the chain is sprinkled with water or passes through 

a solution, the sliding part of the chain forms a local 

battery, leading to surface electrolytic corrosion

Use corrosion-resistant materials that are not invaded by 

chemical reagents. Use wear-resistant materials on 

components that experience mechanical wear