Troubleshooting  Troubleshooting ?Synchronous belt/Belt sprocket

1Premature breakage of belt
2Wear of belt teeth
3Belt tooth jumping
4Shear breakage of belt teeth
5Tear and wear of belt side face
6Longitudinal scratches on belt tooth surface
7Partial cut of belt
8Shrinkage of belt
9Apparent elongation of belt
10Sticky or softened rubber on back of belt
11Wear of rubber on back of belt
12Crack on rubber on back of belt
13Wear of belt sprocket teeth
14Noise
Answers
1


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Premature breakage of belt

Cause 1 Overload Solution Check the inertia of the driven object, motor, conditions of use, etc.
Cause 2 Shock load Solution Increase the belt size or install a shock damping mechanism.
Cause 3 Bent belt Solution Exercise caution during belt transportation, storage and installation.
Cause 4 Too small belt sprocket diameter Solution Increase the number of belt sprocket teeth above the allowable minimum number of teeth.
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2


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Wear of belt teeth

Cause 1 Overload Solution Modify the design.
Cause 2 Too high installation tension Solution Adjust the installation tension.
Cause 3 Insufficient installation tension Solution Adjust the installation tension.
Cause 4 Incorrect belt sprocket tooth profile or incorrect dimensions of the tooth part Solution Use a belt sprocket having the correct tooth profile and dimensions.
Cause 5 Use in dusty atmosphere Solution Improve the atmosphere or install a cover.
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3Belt tooth jumping
Cause 1 Shock load Solution Increase the belt size.
Cause 2 Insufficient belt installation tension Solution Apply an adequate installation tension.
Cause 3 Insufficient number of meshed teeth Solution Either increase the number of belt sprocket teeth or increase the number of meshed teeth by using an idler.
Cause 4 Insufficient rigidity of frame on which belt is used Solution Use a frame having sufficient rigidity.
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4


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Shear breakage of belt teeth

Cause 1 Ultimate symptom of Problems 2 and 3 Solution Same action as for Problems 2 and 3.
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5


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Tear and wear of belt side face

Cause 1 Poor parallelism between shafts Solution Make the shafts parallel.
Cause 2 Poor belt sprocket alignment Solution Align the belt sprockets accurately.
Cause 3 Insufficient rigidity of frame on which belt is used Solution Use a frame having sufficient rigidity.
Cause 4 Bent flange Solution Replace the bent flange with a good one or remedy the bent flange.
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6


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Longitudinal scratches on belt tooth surface

Cause 1 Belt running on edges of belt sprocket Solution Align the belt sprockets and make the shafts parallel.
Cause 2 Belt running on flange Solution Apply an adequate installation tension.
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7


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Partial cut of belt

Cause 1 Jammed with foreign objects Solution Improve environment or install a cover.
Cause 2 Belt running on flange Solution Apply an adequate belt installation tension and make the shafts parallel accurately.
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8


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Shrinkage of belt

Cause 1 Swelling due to oil/water Solution Either improve environment so that the belt is not wetted by oil/water or install a cover.
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9Apparent elongation of belt
Cause 1 Approaching shafts due to movement of shafts Solution Secure the bearing rigidly. If shock is strong, use a stopper to prevent the bearing from moving.
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10


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Sticky or softened rubber on back of belt

Cause 1 Slipping of back pushing idler Solution Apply an adequate installation tension. Reduce the inertia of the idler
Cause 2 Adhesion of oil Solution Either improve environment so that the belt is not wetted by oil or install a cover.
Cause 3 Use in high temperature atmosphere Solution Lower the atmosphere temperature
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11Wear of rubber on back of belt
Cause 1 Poor parallelism of back pushing idler shaft Solution Make the idler shaft parallel.
Cause 2 Poor rotation of back pushing idler Solution Improve idler rotation.
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12


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Crack on rubber on back of belt

Cause 1 Too small belt sprocket diameter Solution Increase the belt sprocket diameter.
Cause 2 Use in low temperature atmosphere Solution Optimize atmosphere temperature
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13


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Wear of belt sprocket teeth

Cause 1 Inadequate belt sprocket material Solution Impart wear resistance to the belt sprocket by using harder material, hardening the tooth surface or surface treatment.
Cause 2 Use in dusty atmosphere Solution Improve the atmosphere or install a cover.
Cause 3 Too high installation tension Solution Adjust the installation tension.
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14Noise
Cause 1 Too high installation tension Solution Apply an adequate installation tension.
Cause 2 Overload Solution Increase the belt size.
Cause 3 Poor shaft parallelism or poor belt sprocket alignment Solution Make the shafts parallel and align the belt sprockets.
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