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Those familar with the SAE 9T splined shaft J498 16/320P will have at some point experienced problems with them shearing at the waist.

For the past 10 years Vivoil have manufactured this shaft without the waist, thus increasing the torque from 67Nm to 100Nm. This greatly improves the longevity of pumps fitted with this shaft, especially those with large displacements.

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