Yanmar Vio35 Swivel Joint Rebuild

2012 Yanmar Vio35-6a swivel joint rebuild
27mm Crows foot
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BSPP Cap and plug set
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Crows foot wrench set
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Maintenance Kit
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[@kev63rod]

What are the symptoms of needing a rebuild? I have the same machine

[@SparkysGarage]

If you have a disconnect or mismatch from the controls in the cab to any of the hydraulics to the lower half of the machine then it could be the swivel joint that is the problem.
I had very low track power and pretty bad blade drop, The back fill blade would randomly drop while moving.