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Re: hydro pump mystery
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Posted by Hugh MacKay on November 25, 2005 at 14:56:29 from (209.226.106.178):
In Reply to: Re: hydro pump mystery posted by fenton on November 25, 2005 at 11:47:29:
fenton: I have been watching this discussion and somehow it seems to be going nowhere. Someone is not communicating very well. Did you by chance split this pump leaving the front cover with the engine block. Have you gotten to the driving gear on pump shaft, driven by the timing gears. By the looks of that shaft in my IT manual, it looks like a taper on shaft where gear fits to it. It has a key, suggesting to me the gear is held on by threaded end of shaft using a nut. Forget those pumping gears for the time being. The gear you must concern yourself with is the gear driven by the timing gears. The one with the spiral teeth. That gear must be removed from shaft to get to the seal. The only place that pump can leak internally into the crankcase is along that shaft that protrudes into the timing gear chamber. My diagram shows a seal on the external side of the front half of the pump housing. Two days ago when I said I never had one of these pumps apart, that is precisely what I meant. That didn't mean I've never had a hydraulic pump apart. They all have one thing in common, that being a driving shaft, and along that driving shaft is the only way hydraulic oil can leak into the crankcase, in this application. In all your communication you speak of gears, but you never identify whether they are oil pumping gears or driving gears. Until you do that no one can help you. By the way the pump in my IT manual is a Pesco pump. It states some tractors are equiped with a Thompson pump.
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