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JD 850 overhaul

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Chris Wolfe

07-08-2002 05:56:00

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I've got a JD 850 with a Yanmar Engine that quit running. The engine cranked slowly and made a squealing noise. With the help of a friend, we tore the engine down, and replaced loose rod bearings and damaged rings. Before putting it back together we cranked the engine a couple of times and the squeal was gone. When the engine was reassembled it cranked slowly, never starting, and eventually made the loud squealing noise. My friend is inclined to think we will need to teardown and replace the crank bearings.

I bought a new battery but the JD Dealer said if I didn't use it soon it would need to be recharged. I wonder if the battery was just not fully charged enough to start?

Any thoughts or suggestions would be appreciated.

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G-MAN

07-08-2002 16:01:11

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Re: JD 850 overhaul in reply to Chris Wolfe, 07-08-2002 05:56:00

Chris, I'm just taking at stab here, so don't hold me to this. I rebuilt a small Yanmar tractor engine once that had some similar symptoms. The engine had lost oil pressure and did some damage to the bottom end - we ended up grinding the crank and installing new bearings as well as working the head and installing new pistons/liners. The culprit in the bottom end damage was the oil pump.
I'm looking at an 850 parts picture here, and it looks like the front cover has to be removed to inspect the oil pump. I can't remember exactly what was wrong with the one I worked on, but I believe it was some plastic component in the oil pump that failed - possibly the drive gear itself - it's been a long time ago. I know this is probably not much help, but I think you need to investigate this a little further, as you have some other problem there. Those Yanmars are pretty good little units, and the only thing that will cause severe crank/bearing wear is lack of lubrication or contaminated oil, so check that pump out. It also shouldn't take a lot to start that little engine, so if it's cranking slowly, it could very well be due to damaged main bearings. I would get a service manual (make sure it covers the engine in detail), and dig a little further. If I remember right, parts aren't real cheap for those little buggers.

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chris

07-10-2002 10:27:13

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Re: Re: JD 850 overhaul in reply to G-MAN, 07-08-2002 16:01:11

Thanks for the suggestions. Were going to start working on it today.

Although we have a couple of other tractors we use for our bigger jobs, the JD was perfect with a belly mower for maintaining some of the smaller pastures and yards. Unfortunately, everyone and their brother borrowed it and no one bothered to check the oil.

I had hoped the rod bearings and rings were the problem but suspected the crank bearings, I was just hopeing not to have to tear into it that far. Will also check oil pump.

Thx,
C

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