Troubleshooting　Top chain

Conveyor Equipment

1	Abnormal noises: Squeaking, rattling
2	pulsation

Chain

3	Abnormal wear on the chain conveying surface
4	Abnormal wear or scratches on the backside of the chain
5	Abnormal wear on the side of the chain
6	The chain is stiff to bend
7	Chain breakage or damage
8	Chain discoloration

Conveyor peripherals and parts

9	Wear debris accumulates along the rails and under the drive sprocket
10	Chain teeth skipping or poor meshing

Transported goods

11	Products tip over at conveyor transfer points, etc.

Conveyor Equipment

1	Abnormal noises: Squeaking, rattling

Cause 1	The chain is hitting the safety cover, frame, etc.    [Click to enlarge]	countermeasure	Locate the source of the noise and correct it to prevent contact.
Cause 2	The chain is running in an area where the rail guide clearance is narrow.	countermeasure	Identify the narrow areas and check for any thermal expansion or deformation of the rails and correct them.
Cause 3	The rail surface is rough or the dimensions or material are inappropriate.	countermeasure	Replace rails with ones that have the appropriate surface finish, dimensional accuracy, and material.
Cause 4	The chain moves in the opposite direction.	countermeasure	Redo the chain hem.
Cause 5	Insufficient lubrication or excessive operating conditions.	countermeasure	Modify the lubricant and lubrication method.

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2	pulsation

Cause 1	The position and spacing of the return rollers and the position and size of the catenary curve are inappropriate. [Click to enlarge]	countermeasure	Refer to the catalog technical notes and correct any improper parts to ensure a smooth return run.
Cause 2	The idler roller or return roller does not rotate smoothly.	countermeasure	Measures are taken such as using bearings to make it easier to rotate smoothly and increasing the diameter.
Cause 3	There are some places where the rail guide clearance is narrow.	countermeasure	Identify the narrow areas and check for any thermal expansion or deformation of the rails and correct them.
Cause 4	Foreign matter adhering to the rails is hindering sliding.	countermeasure	Clean the rails by removing any foreign matter.
Cause 5	The rail is caught on a sharp edge or an obstacle	countermeasure	Smoothing sharp edges and removing obstacles.
Cause 6	Insufficient lubrication or excessive operating conditions.	countermeasure	Modify the lubricant and lubrication method.

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Chain

3	[Click to enlarge]	Abnormal wear on the chain conveying surface

Cause 1	The return roller is not rotating.	countermeasure	Increase the diameter of the return roller or change the specifications.
Cause 2	The return entrance radius is too small or the diameter of the return roller is too small.	countermeasure	Refer to the catalog technical notes and make corrections.
Cause 3	The surface finish of return-way rail is rough, or the placement or material is inappropriate.	countermeasure	Surface finish and rails of appropriate material should be arranged so that they contact evenly across the chain width.
Cause 4	Roughness that promotes friction adheres to the return rollers and rails.	countermeasure	Clean the conveyor. Identify the cause and take measures.
Cause 5	Guide channel or obstacles are damaged.	countermeasure	Identify and correct obstacles.

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4	Abnormal wear or scratches on the backside of the chain

Cause 1	Foreign matter is stuck or buried on the conveying rail, causing scratches on the chain.	countermeasure	Remove any foreign matter and clean.
Cause 2	The surface finish of the rail on the transport side is rough.	countermeasure	Correct the surface finish or replace with a suitable rail.
Cause 3	Contact marks with the idler wheel.	countermeasure	Replace the sprocket if necessary.

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5	Abnormal wear on the side of the chain

Cause 1	The rail or sprocket is not in the correct position.	countermeasure	Correct the position.
Cause 2	The surface finish of the curved Plastic rail is rough or the material is inappropriate.	countermeasure	Replace the rail with one that has an appropriate surface finish and material.
Cause 3	Insufficient lubrication or excessively harsh curve conditions.	countermeasure	Correct the lubrication method, etc.

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6	The chain is stiff to bend

Cause 1	Pins and links are bent or galled due to overload.	countermeasure	Remove the stiff spot or replace with a new chain.

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7	Chain breakage or damage

Cause 1	A foreign object or obstacle has been caught.	countermeasure	Remove any foreign objects or obstacles.
Cause 2	Brittle fracture due to deterioration and corrosion caused by chemicals and high temperatures.	countermeasure	Identify the cause and change the conditions of use or change the chain specifications.
Cause 3	The chain has climbed over the sprocket.	countermeasure	Replace the chain as it is caused by wear and elongation of the chain.
Cause 4	The conditions of use were severe and an excessive amount of tension was applied.	countermeasure	Identify the cause and take measures.
Cause 5	The plug has fallen off.	countermeasure	Check the condition of the plug. Replace it with a new one.

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8	Chain discoloration

Cause 1	Dirt is attached.	countermeasure	Wash.
Cause 2	Deterioration caused by chemicals, high temperatures, ultraviolet rays, etc.	countermeasure	Check the conditions of use and replace the chain with one that meets the appropriate specifications.

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Conveyor peripherals and parts

9	Wear debris accumulates along the rails and under the drive sprocket

Cause 1	The surface finish of curved Plastic rail and other parts is rough.	countermeasure	Change the material grade of the curved Plastic rail.
Cause 2	Sharp edges or obstacles on the rail end are scraping the chain.	countermeasure	Smooth the edges.
Cause 3	Insufficient lubrication.	countermeasure	Provide adequate lubrication.
Cause 4	Presence of roughness.	countermeasure	Identify the cause and take measures.

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10	Chain teeth skipping or poor meshing

Cause 1	The chain is overstretched.	countermeasure	Replace the chain and sprockets.
Cause 2	Foreign matter has accumulated on tooth root.	countermeasure	Remove any foreign matter and clean.
Cause 3	The sprocket is out of position.	countermeasure	Redo the installation.
Cause 4	Inappropriate sprocket (damaged, deformed, swollen, corroded).	countermeasure	Investigate the cause, recheck the specifications, and replace if necessary.
Cause 5	Damage to the area around the hub of a split sprocket.	countermeasure	Check for loose or over-tightened sprocket bolts. When replacing, check that the bolts are tightened to the correct torque.

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Transported goods

11	Products tip over at conveyor transfer points, etc.

Cause 1	Position and shape of guide channel, chain level, speed ratio, lack of slippage.	countermeasure	Make the guide angle gentler. Change the guide position. Adjust the speed and lubrication. Check the level. Make changes as necessary.

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