Why has my ERO Joint® Timing belt broken and how can I analyse it?

Discover our troubleshooting solutions for ERO joint® HP Timing belts and ERO joint® WT wide timing belts.

Troubleshooting guide for ERO joint® HP Timing belts
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Courroie dentée ERO Joint HP avec guide AT20

Problem encountered

Possible reason for fault

How can we solve the problem?

Rupture of the junction

Too much voltage

Incident or wear

The rod has been inserted incorrectly / The teeth of the joint are not aligned correctly / dismantling of the belt

ERO joint - guide

We advise you to reduce the voltage

The photo below shows a case where the rod has not been correctly inserted (you can see that the Cords in the junction are not damaged). The possible reason for the junction breaking could be due to the junction teeth being misaligned.

Please read the assembly instructions carefully and observe the following instructions:

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alignement de la denture et centrer l'insertion des tiges

Do not dismantle the Belt (please consult us if necessary)!

The stem is difficult to insert

You have no lubricant

Teeth are misaligned at the junction


You have not used a chamfered shank

Use water to aid insertion

It is imperative that the teeth are perfectly aligned at the junction

You need to insert a chamfered stem (don't hesitate to ask us for one)

Troubleshooting guide for ERO joint® WT wide Timing belts
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Courroie large ERO Joint WT

Problem encountered

Possible reason for fault

How can we solve the problem?

You notice that the junction is broken, broken off

Too heavy a load

Accident or wear

Too much tension

Modify the current joint with a reinforced 5-rod joint

We advise you to reduce the tension

End fingers spread apart

The Belt is fitted upside down, wrong direction of travel

You haven't used the Glued and lubricant that we supplied to you

Check that the Belt is correctly fitted and that it runs in the correct direction.

The pins have moved towards the edges of the Belt

You restarted too quickly after installing the Belt (glue and lubricant did not have time to dry).

There is too much stress in the belt

Replace smooth rods with notched rods