OCM Roller Chain Troubleshooting Guide
Troubles and their causes, countermeasure for transmission

CAUSE : Sprockets are not installed in flat surface

SOLUTION : Use straight edge ruler on the side of sprocket and re-align sprocket surfaces

CAUSE : Rotation is uneven

SOLUTION : Change speed of chain
Change tension of chain
Add idler or tensioner to stop vibration

CAUSE : Fluctuation of load is excessive

SOLUTION : Use torque converter or liquid coupling

CAUSE : Uneven stretching due to abrasion

SOLUTION : Immediately replace chain and lubricate sufficiently

CAUSE : Excessive overload is applied

SOLUTION : Try to reduce overload
Move up chain number to larger one

CAUSE : Lubrication is not adequate

SOLUTION : Once clean chain and lubricate correctly to operating condition

CAUSE : There is corrosion

SOLUTION : Install casing
Clean and lubricate periodically

CAUSE : Installation is not adequate

SOLUTION : Replace chain with new one
Check and align the installation of sprocket and shaft

CAUSE : Chain sag is not proper amount

SOLUTION : Align centering distance of sprocket so that it becomes most proper slack amount for chain transmission

CAUSE : Chain and sprocket have excessive abrasion

SOLUTION : Replace chain and sprocket

CAUSE : Lubrication is not sufficient

SOLUTION : Conduct proper lubrication for operating condition
Higher the viscosity of lubricant, lower the noise

CAUSE : Improper installation of sprocket or shaft

SOLUTION : Check condition of sprocket and shaft installation and correct it

CAUSE : Improper installation of chain casing or bearing

SOLUTION : Check if chain casing is touching chain and retighten bearing bolt

CAUSE : Operating condition is not sufficient

SOLUTION : Change speed of chain
Change tension of chain
Install vibration stopper (idler or tensioner)

CAUSE : Excessive over load is applied

SOLUTION : Try to reduce overload
Change chain number to larger one

CAUSE : Chain is extremely elongated with abrasion

SOLUTION : Replace chain

CAUSE : Improper sprocket

SOLUTION : Replace sprocket

CAUSE : Rotation speed and load are much higher than normally selected value

SOLUTION : Selection of chain shall be done again

CAUSE : Insufficient lubrication

SOLUTION : Lubricate to fit operating condition and environment

CAUSE : Excessive chain vibration

SOLUTION : Change tensioner or install vibration stopper so that vibration becomes minimum

CAUSE : Chain and sprocket bite foreign object

SOLUTION : Remove foreign object and install protector

CAUSE : Unexpected shock load is applied

SOLUTION : Start over chain selection
Reduce shock with installing absorber

CAUSE : Corrosion due to inferior atmosphere

SOLUTION : Install casing or periodically clean and lubricate

CAUSE : Distance between centers of sprocket is too long

SOLUTION : Shorten center distance or change intermediate idler

CAUSE : Chain sag is excessive

SOLUTION : Decrease chain sag or install tightener

CAUSE : Improper selection of chainand sprocket

SOLUTION : Change to smaller pitch chain, or larger number of sprocket teeth

CAUSE : Unexpected overload with shock is applied

SOLUTION : Start over chain selection
Soften shock with installing absorbor
Improve starting up smoothly

CAUSE : Excessive vibration

SOLUTION : Install tightener or intermediate idler to reduce vibration

CAUSE : Inertia of sub transmission side is unexpectedly too high

SOLUTION : Start over chain selection
Increase number of strands of chain, or change to larger number of chain

If this still does not solve the issue, please prepare the following information and contact to your supplier.
But please check these points first before asking

  • Check point 1 - Is the chain properly installed?
  • Check point 2 - Is the installation condition of sprocket and shaft adequate?
  • Check point 3 - Is any force other than tensile strength of chain existing?
  • Check point 4 - Has only chain or sprocket already replaced?
  • Check point 5 - Is the tensioner and lubricating method properly done?

Operating Information when reporting failure

  • 1. Defective condition of chain that shows specific point of failure. Prepare defective sample or photos
  • 2. Approx. amount of tensile strength
  • 3. Application and layout of chain installation
  • 4. Operaing environment
  • 5. Lubricating condition