I have a New Holland 7630 - S100 - 2004, has a problem in the gearbox. It seems to me that it is the hydraulic pump, but I do not encourage to disarm without a manual. The tractor is a bit and stops advancing even if it continues with the march hooked, as if the drunk disk is slipped (the disc is fine) if you take out the filter it advances a little more and return to do the same but it boots the oil.
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