656 issues

Greg K · Jun 20, 2014

I have a friend who has a 656 that is dumping hydraulic fluid out of the front bolster. There is a cap underneath that has some o-rings on it he says. He replaced the o-rings and put a thicker gasket behind the cap and it still puked out. It sounds like a stuck bypass valve to me but I don't know the first thing about those tractors. What could be the problem and where would a guy start looking? Thanks.

mkirsch · Jun 20, 2014

Find out where the oil is coming from. If it's not pouring out of the top cover, replacing the gasket and orings in that top cover is a waste of time.

I doubt it's a stuck bypass valve, because it doesn't make sense that a bypass valve would vent to atmosphere. Even in the 60's that was a no-no, if not for anything else but the oil was expensive to replace and it made a mess on the tractor.

Most likely the oil is either coming from a blown line, or out the bottom steering arm seal.

pete 23 · Jun 20, 2014

No gasket under that cap. Just o-ring. Putting a gasket would lessen the sealing of the o-ring. I has a leaker couple years ago, not pouring it out but leaking, that someone had not installed the o-ring that goes on the sleeve piston rides in. Was able to pull sleeve out a little and put an o-ring on it. Those lines leak more often than anything else.

656 issues

Greg K

Well-known Member

mkirsch

Well-known Member

pete 23

Well-known Member

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