JD 790 Oil Drain Plug Stuck: John Deere Review  -- John Deere Tractors Discussion Forum and Review JD 790 Oil Drain Plug Stuck: John Deere Review -- John Deere Tractors Discussion Forum

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 11-05-2012, 08:41 Post: 185390
Astrobiker



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 JD 790 Oil Drain Plug Stuck

I have a 2002 JD 790 4WD and I've changed the oil 4 or 5 times on since I've had it. This model has the drain plug on the side of engine block. I tried to drain the oil this weekend for another oil change but drain plug seemed to be stuck. In fact the bolt head is damaged from my efforts to remove it. I am thinking my only option now is to order a new drain plug and get a damaged bolt remover set from Sears to get the plug out. Has anyone else had this problem? Any other ideas on how to fix it?

Thanks!






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 11-05-2012, 12:55 Post: 185393
hardwood

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 JD 790 Oil Drain Plug Stuck


Yes, but not with a tractor.
Mine was an XUV Gator transmission drain plug. The plan was to drai n and refil the original fluid, but the plug was stuck fromthe factory so tight it had to be destroyed to remove it.
I don't know what Sears has for a removal tool, but I can tell you already it won't work. The answer to removing a broken off right hand threasd bolt or plug is a set of LEFT HAND drill bits. I got mine at Fastenall quite a few years ago, I'm sure any machine shop supply house would stock them. They aren't that awfull expensive as I remember but sure take the frustration out of removing a bolt.
Start with a small bit 1/8 or 3/16 this can be a right hand bit if you like, then work up to a bigger bit with left handers. all at once the old shell will scrw out with the drill bit leaving the threads in the pan unharmed.

PS; Another special tool you don't loan, or tell too many "Friends" that you own.


Frank.






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 11-05-2012, 14:11 Post: 185394
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 JD 790 Oil Drain Plug Stuck

Pretty sure both tools are intended to accomplish the same job. The Sears tool probably requires a pilot hole be drilled first. I've seldom had 100% success with either. Either the took didn't grab, the reverse drill bit broke, or I damaged the female threads. I've had much more success removing reluctant plugs/bolts with a hammer and vice grips.

The trick is to first break loose whatever's causing the resistance. Usually it's either paint or rust. One or two good smacks with a hammer usually does that par, after which the recalcitrant eventually yields to a vice grip pliers.

//greg//






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 11-05-2012, 14:24 Post: 185396
hardwood

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 JD 790 Oil Drain Plug Stuck


Gregg;

I've got sa whole box full of differeent ez-out gizmos that were all a failure compared to the left hand bits.
An old friend who ran a machine shop tipped me off to the left had bit thing years ago.
The worst case situation, and I've been there is to have an ez-out snap off level with the end of the broken stud or plug. Those things are hard as glass and impossible to drill out, so the next step is usually the acetylene torch, but that raises all kinds of other issues, don't go there if at all possible.

Frank.






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 11-07-2012, 08:45 Post: 185412
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 JD 790 Oil Drain Plug Stuck

I have had success with an impact wrench over anything else. It will sit there and hammer on it and help break loose rust or such. Of course be certain you are trying to turn the correct direction. They do make sockets that "may" grab damaged bolt heads. Had same issue on oil pan and ended up with inch impact and the first touch of trigger had it out.






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 11-07-2012, 09:00 Post: 185413
hardwood

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 JD 790 Oil Drain Plug Stuck

KT;
I'll be the first to admit that I don't take the time to find the proper torque that drain plugs should be tightened to, I'm sure that I over tighten them just as a feel good measure.
The drain plug on the Gator transmission isn't on the bottom, it is on the side at the lowest point. That wouldn't have been a problem except that a frame member is about two inches away blocking any direct from above tools like an impact wrench or my drill bit solution. A JD tech. who stopped by to help, said he had never had one that with the proper wrench didn't come out till mine came along.






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 11-07-2012, 17:30 Post: 185416
auerbach



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 JD 790 Oil Drain Plug Stuck

Common easy-outs are generally designed for a smaller bolt. Two alternatives:

1. Invest in the right vice-grip. Brand name, curved jaws, sharp teeth, and closer to 12" than 6". Squeeze the bolt-head with full force, maybe put a large pipe over the handles, and reef away.

2. Get a long, good quality, 6-pt hex wrench a smidge too small. File the bolt hex surfaces so the wrench socket just fits if you tap it on with a hammer. Whack the wrench with a sledge.

Once it turns the first speck, it's easy. Sometimes they stick because last time, someone neglected to install a gasket, preferably a new copper or nylon one.






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 11-07-2012, 17:37 Post: 185417
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 JD 790 Oil Drain Plug Stuck

A totally different thought that I HAVE NO experience with only seen them for sale...the pumps that you drop a tube down the dipstick tube and pump the oil out. Not too sure on that picks up the full depth of the oil pan nor how well that would be for draining any sludge.






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 11-08-2012, 10:19 Post: 185423
Murf

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 JD 790 Oil Drain Plug Stuck

So far the best way I've ever found for removing a bolt with a rounded head is an arc welder.

Seriously.

I weld a piece of bar to the bolt head to use as a lever. Between the heat of the welder and the grip of the bar, it's worked every time so far for me.


Best of luck.






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 11-09-2012, 06:49 Post: 185429
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 JD 790 Oil Drain Plug Stuck

Quote:
Originally Posted by kthompson | view 185417
A totally different thought that I HAVE NO experience with only seen them for sale...the pumps that you drop a tube down the dipstick tube and pump the oil out. Not too sure on that picks up the full depth of the oil pan nor how well that would be for draining any sludge.

:Mine works fine, but ONLY if the engine oil is HOT. The thicker the oil, the longer it will take to suction out. Same with sludge. When it's cold, it will stay stuck to the pan. When it's good and hot, it will come out with the oil.

But I've only used mine for on-road vehicles. I can see a potential problem using it with some 4wd tractors. To accommodate clearance for the front driveshaft, some of my tractors had two drain plugs. You'd be working in the blind relative to moving the suction tube from one side of the sump to the other.

//greg//






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Discussion Boards > Active Subjects > Messages as Posted > John Deere Review Forum

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