Problems

1. CHAIN STRETCHING

Chain joint wear and tear

Replace the chain following the recommendations: The drive sprockets must have an odd number of cogs. Use a greater number of sprocket cogs (but no more than 120). The degree at which the chain goes around the sprocket must be at least 120 degrees. The maximum angle between the drive and the horizontal plane must be 60 degrees. The drive must have a tension device. All chains must be periodically washed and lubricated.

Incorrect engagement with the drive sprockets

Keep an eye on the condition of the sprockets and on the precision of their relative positioning.

2. WEAR AND TEAR ON THE INSIDE OF THE INNER PLATES AND ON ONE SIDE OF THE SPROCKET

The drive shafts are not parallel in the horizontal and vertical planes and the mid point planes of the sprockets are shifted relative to the mid plane of the centers of the gears

Replace the chain and the sprockets if necessary. Adjust the chain drive by: checking that the shafts are parallel and that the mid planes of the sprockets are aligned.

3. THE CHAIN GETS STUCK ON A SPROCKET

Wear and tear of the sprocket

Replace the sprocket and the chain

The drive shafts are not parallel in the horizontal and vertical planes and the mid planes of the sprockets are shifted relative to the mid plane of the centers of the gears

Replace the chain and the sprockets if necessary. Adjust the chain drive by: checking that the shafts are parallel and that the mid planes of the sprockets are aligned.

4. INCORRECT ENGAGEMENT AS A RESULT OF THE SHIFTING OF THE CHAIN HINGES ON THE COGS OF THE SPROCKET TO A GREATER ENGAGEMENT DIAMETER

Lack of chain tension

Tighten the chain

Chain wear and tear

Replace the sprocket and the chain

Wear and tear of the sprocket

Replace the sprocket and the chain

Excessive loads on the chain

Replace the chain. Eliminate the cause of the excessive loads being transmitted to the chain or redesign the drive for a larger, stronger chain.

5. LACK OF PINS OR DAMAGED PINS

The pins are installed incorrectly

Install new pins as per the manufacturer's instruction

The chain impacts the parts of the drive during operation

Replace the chain. Eliminate the cause of the impacts

Vibration

Replace the chain. Eliminate the vibration. If possible, use sprockets with a larger number of cogs.

The chain moves at an excessively high speed during operation

Replace the chain. Reduce the operating speed. If possible, redesign the drive for a shorter step chain.

Rotation of the chain rollers

See the section on rotation of the chain rollers.

6. CRACKS ON THE PLATES (CORROSION UNDER TENSION)

Impact of an aggressive environment causing corrosion as well as excessive tension resulting from the chain being stretched too much when installed

Replace the chain. Protect the chain from the elements

7. DISRUPTION OF THE FREEDOM OF MOVEMENT OF THE CHAIN LINKS RELATIVE TO EACH OTHER

Abrasion in the chain links

Clean and re-lubricate the chain.

Insufficient lubrication

Replace the chain. Re-lubricate.

The drive shafts are not parallel in the horizontal and vertical planes and the mid point planes of the sprockets are shifted relative to the mid plane of the centers of the gears

Replace the chain and the sprockets if necessary. Adjust the chain drive by: checking that the shafts are parallel and that the mid planes of the sprockets are aligned.

Internal corrosion

Replace the chain. Protect the chain from the elements.

Excessive loads on the chain resulting in the deformation of the roller

Replace the chain. Eliminate the cause of excessive loads on the chain. If possible, redesign the drive for a larger chain.

8. ROTATION OF THE CHAIN ROLLERS

Insufficient lubrication of the chain

Replace the chain. Re-lubricate properly

Excessive loads on the chain

Replace the chain. Eliminate the cause of excessive loads on the chain. If possible, redesign the drive for a larger chain.

9. INCREASE IN THE SIZE OF THE PLATE HOLES

Excessive loads on the chain

Replace the chain. Eliminate the cause of excessive loads on the chain. If possible, redesign the drive for a larger chain.

10. DESTRUCTION OF CHAIN ROLLERS AND PLATES

Excessive loads on the chain

Replace the chain. Eliminate the cause of excessive loads on the chain. If possible, redesign the drive for a larger chain.

11. CRACKS ON PLATES (MATERIAL FATIGUE)

Dynamic loads on the chain are in excess of the acceptable level

Replace the chain. Reduce the dynamic loads or redesign the drive for a larger chain.

12. IMPACT TRACES ON THE BUTT-ENDS OF PLATES

The chain impacts the parts of the drive during operation

Replace the chain. Eliminate the cause of the impacts.

13. WEAR AND TEAR OF PLATES AROUND THE PERIMETER

The chain comes into contact with the crankcase, guides or other components of the drive

Replace the chain if 5% or more of the height of the plate is worn down or if there is any plate discoloration as a result of exposure to high temperatures. Tighten the chain. Eliminate the cause of the chain rubbing against the components of the drive.

14. DESTRUCTION, CRACKING, DEFORMATION OF THE CHAIN ROLLERS

The speed the chain is operated at is too high

Replace the chain. Reduce the speed or redesign the drive for a shorter step chain.

Few cogs on the sprockets

Replace the chain. Use sprockets with more cogs or redesign the drive for a shorter step chain.

Violation of the conditions for normal engagement as a result of the shifting of the chain hinges across the cogs of the sprocket to a larger engagement diameter

See the paragraph on the violation of the conditions for normal engagement as a result of the shifting of the chain hinges across the cogs of the sprocket to a larger engagement diameter

15. WEAR AND TEAR OF THE CHAIN ROLLERS

The speed of operation is too high or the loads on the chain are too great

Reduce the speed or the load. If possible, change the design of the drive: if the operation speeds are too high, replace the chain with one with a shorter step and if the loads are too high, replace the chain with one with a longer step. If both negative factors are present, chain consisting of multiple strands must be used.

Insufficient lubrication

Apply the right amount of lubricant or re-lubricate.

16. EXCESSIVE NOISE

The chain impacts the parts of the drive during operation

Replace the chain. Remove the obstacle.

The crankcase or the drive shaft are not properly fixed

Tighten the bolts.

Lack of chain tension

Tighten the chain.

Chain wear and tear

Replace or tighten the chain and replace the sprocket.

Wear and tear of the sprocket

Replace the chain and the sprockets if necessary.

The drive shafts are not parallel in the horizontal and vertical planes and the mid point planes of the sprockets are shifted relative to the mid plane of the centers of the gears

Adjust the chain drive by: checking that the shafts are parallel and that the mid planes of the sprockets are aligned.

Insufficient lubrication

If necessary, replace the chain. Re-apply enough lubricant.

The sprocket has too few cogs

Check if sprockets with more cogs can be used.

The chain stretches beyond the acceptable level due to plastic deformations

Eliminate the cause of excessive loads on the chain or redesign the drive for a larger chain.

17. TRACES OF CORROSION ON COMPONENT PARTS OF THE CHAIN

The chain is exposed to the environment

Replace the chain. Protect the chain from the elements

There is water in the lubricant

Replace the lubricant. Eliminate the cause of water seeping into the lubricant

Insufficient lubrication

Apply enough lubricant or replace the lubricant. If necessary, replace the chain

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