Posted by MN Scott on June 06, 2009 at 17:19:40 from (206.9.216.31):
We had one of our 2/10's rain days today so I pulled my progect 756 in the shop to fix the last issue "hopefully" before paint. The rear pump is sucking air. I hooked up a flowrater and could not get a GPM rating as it seems to be flowing 50% air. The three point hitch also raises in jerks and is spongy with no load. I pulled the pump for inspection. The seal on the suction tube to filter housing was gone so I replaced that and the oring reinstalled and filled with oil. Same thing, sucks air. The front MCV pump has no issues, no air burps, priming issues, nothing. So I think the oring between the speed and range gear housing must be good. The only other place it could be sucking air is the pickup tube I guess. Looking at it from pump hole I could see no cracks and there is no movment in its mounts or frame. Were do these things crack or does the oring just leak? Its hard to belive an oring is letting in all this air unless it totally gone. Also if its sucking all this air thru the pickup tube I would think the front pump would be getting some air too. I can't think of were else this air could be comming from, any ideas? Anyone changed a pickup tube without pulling the cover? I am out of Hytran so I guess I'll have to get a pail monday and try the 5 gallon overfill thing and see if that solves the problem.
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