743B Drive Motor, O-Ring breakdown, Disappearing - Hydraulic Oil?

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Aug 16, 2017
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I recently rebuilt the drive motors in a 743B with in six month ref 21 was missing. On the original rebuild the o-ring was in pieces and partially missing. This time the ring back up was there and unbroken but the o-ring was gone completely. So wondering what could cause this? Type of Hydraulic fluid? Viscosity of fluid? That particular o-ring is a different color than the standard black. Probably a Viton material. Viton should stand up to anything. Would be helpful to many if this is hydraulic related. I use L-HM 46. Any thoughts on this?
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