Re: Oil pressure question re:JD 850 w/Yanmar engin

Posted by mark on June 10, 2007 at 21:05:51 from (172.168.44.250):

In Reply to: Re: Oil pressure question re:JD 850 w/Yanmar engin posted by omahagreg on June 10, 2007 at 19:25:27:

Two years ago, I sold my JD 1050 after 20+ years of faithful service....yet it only had 1500 hours on it! I mowed the grass and plowed the garden with it. I started having the same trouble you are. I had babied that little tractor from day one, always kept in the barn, changed oil twice a year and it never did a hard days work while I owned it. I suspicioned the oil pump....no way the mains could be bad! I ordered one and went to the service dept. and asked for a copy of their repair manual pages. The mechnic asked me why I thought it was the pump? I explained myself and he said....."well, if it were me, I'd take that pump back to parts and get my money back. Your pressure is held on the mains in that engine (some engines the pressure is measured on the cam bearings) and that is where your problem is." So, I get a spec sheet and go home..without the new pump. I tap a gage in at the pump and at cold start up, it held 60 psi. But as it warmed, it began to fall. The idiot light comes on at 25 I think...and mine held 23 pounds....and the light was flickering. I believe it was supposed to hold 40 at idle and warm. Anyway......the gage told the story. The mains had wear. Why at 1500 hours? I cannot say. So, I sold it, told the guy why and he is still running it and happy as a lark. Just set the throttle higher and the light goes out as pressure builds. No, it won't heal itself and will only get worse. But, in the 1950's, Chevy trucks idled at about 6 pounds pressure and I guess that was enough. If i wasn't in too deep on that 850, I'd just keep running it...fast enough to keep the light off and forget it. When you go buy parts and overhaul it, you'll spend big bucks. I was told there is very little meat in a Yanmar crank to regrind if it's scored or out of round. They priced me a new crank at $750.

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