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John Deere Tractors Discussion Forum
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Stripped holes (drawbar hitch)

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KB

10-13-2003 16:44:00




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Took the day off to work on the 60 with dad. Pulled the shifter from the top of the transmission found two stripped holes so we drilled them out and put in heli coils. OK not so bad a couple of stripped holes. Then started to work on the 3 point parts, found that the top link is stripped. This seemed a bit odd never heard of something like this being stripped but it is so deal with it. Then noticed that the draw bar hitch is loose so pulled out a sheet of cardboard crawl underneath to tighten up the bolts not a big deal..... as usual the "not big deal" kiss of death strikes, 3 of the 4 bolts are stripped. We are talking 3/4 inch bolts here. Has anyone Heli-coiled on of these? If so, A) where does one get a kit for this at this size, B) any words of wisdom for tackling such a thing?

BTW, stopped early tonight afraid that I might find more stripped holes.....

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ET

10-14-2003 07:02:54




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 Re: Stripped holes (drawbar hitch) in reply to KB , 10-13-2003 16:44:00  
I think the drawbar bolts were 5/8" to start with so if 3/4" is in there now they have been drilled and tapped oversize once already. I had the same problem with my 50 and used heili coils to fix it and it worked great. The only problem I had was the last guy that put in the oversized bolts drilled until he struck oil on one hole. I also locktite the new bolts in to keep them from loosening. If you have a good working relationship witha local machinest he might loan you the special drill and tap to put in the helicoils. Some auto or truck parts stores will loan the drill and tap when you buy the coil.

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F-I-T

10-14-2003 07:46:50




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 Re: Re: Stripped holes (drawbar hitch) in reply to ET, 10-14-2003 07:02:54  
ET:

According to the parts book, the bolts were 3/4" on the '60'.

Frank



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Chris

10-13-2003 20:26:37




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 Re: Stripped holes (drawbar hitch) in reply to KB , 10-13-2003 16:44:00  
A word of advise spend a little more for the tap, a cheap tap will do nothing but cause more grief. We had to drill and tap the frame holes on a 4430 engine, and all they had at the shop was cheap VermontAmerican taps. My brother and I spent a half hour on a single 3/4 hole and we had a few to do. The tap was a satin/dull gray finish. I brought one from home that was a high speed tap, polished/smooth finish and cut four holes in no time flat and with little to no effort, then we thought maybe the VA tap was dull, went and bought a new VA SAME THING, we're big boys and thought we were going to twist that 3/4 VA tap off before getting one hole tapped. VA's are ok for cleaning threads but can't cut large threads for nothing. The other mechanics couldn't believe it either.

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ChuckW

10-13-2003 17:30:26




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 Re: Stripped holes (drawbar hitch) in reply to KB , 10-13-2003 16:44:00  
another good way to run the tap is impact wrench but be careful in adjusting pressure...run it on regulator just enough to cut threads and keep backing a reversing. Use underpower to prevent breaking the tap.



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ChuckW

10-13-2003 17:28:00




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 Re: Stripped holes (drawbar hitch) in reply to KB , 10-13-2003 16:44:00  
those draw bar bolt holes are a pain. My suggest would be to go just to the next size. The studs that are used for the drawbar are oversized so that they kinda seize in the hole, they have regular threads on the bottom. I would use a new tap and the proper drill bit. Have found that a breaker bar works the best and work the tap back and forth. Use the appropriate 12 point to fit your tap. Once thread use a stud and locktite. You should be okay. Don't get in a hurry and it best if you can get the tractor on a ramp or up high. Be sure to properly block or chain it off. a good spot would be like up on trailer ramp.

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JDVan

10-13-2003 17:05:01




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 Re: Stripped holes (drawbar hitch) in reply to KB , 10-13-2003 16:44:00  
KB:


WOW, you are dealing with an unusual occurance. Looks like the PO has been abusing the 3 point hitch and stessing the heck out of the drawbar frame at the same time. Something you might check though on the drawbar hitch frame bolts; Check to see how far the threads are stripped up into the casting. May only be a short distance. These bolts tend to work loose and may have only stripped out the last few threads. Might get lucky!

I've never used a heli coil ever, although others swear by it and I suspect you will be able to find and use a 3/4" helicoil successfully. There is another alternative if you want to go to all the work to do so. You can drill out the holes to a new much larger bolt size. Tap the new hole for the larger bolt or stud and then insert a #8 hardness threaded stud or bolt of the correct diameter. Then cut off the remaining part of the stud or bolt. Then drill the stud or bolt you just put in so that you can tap it for a 3/4" bolt. Lot's of work laying under the tractor and may not be appropriate. Be carefull not drill too far or you will find oil!

I'm curious what type of three point you have on the 60. An aftermarket type or an 800 series hitch?

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KB

10-13-2003 17:13:37




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 Re: Re: Stripped holes (drawbar hitch) in reply to JDVan, 10-13-2003 17:05:01  
The 2 rear holes are stripped way up in there, so we are going to have to do something with them. Maybe going a size bigger isn't a such a bad option, however, where does one get a 7/8" tap?

The 3pt is an after market hitch.



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kjm

10-13-2003 20:27:06




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 Re: Re: Re: Stripped holes (drawbar hitch) in reply to KB, 10-13-2003 17:13:37  
KB,Check with a local industrial machine shop the biggest one here will loan a tap with a cash deposit.(you break it you bought it) It is the reason I buy all of my steel and nuts and bolts from them and it is worth every dime.



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f-I-T

10-13-2003 19:35:08




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 Re: Re: Re: Stripped holes (drawbar hitch) in reply to KB, 10-13-2003 17:13:37  
KB:

I have bought large taps from McMaster-Carr, and ordered from their website: www.mcmaster.com


Frank



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HAVVEY

10-13-2003 18:06:18




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 Re: Re: Re: Stripped holes (drawbar hitch) in reply to KB, 10-13-2003 17:13:37  
ANY INDUSTRIAL SUPPLY PLACE FOR THE TAP AND BOLTS MY SYMPATHY AS THAT DRILLS HARD MIGHT HAVE TO TAKE REAR END OFF AND GO TO MACHINE SHOP



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JDVan

10-13-2003 17:20:05




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 Re: Re: Re: Stripped holes (drawbar hitch) in reply to KB, 10-13-2003 17:13:37  
Ok, not good. My guess is the PO has been using a 3 point boom on the 3 point hitch to cause the damage to the top link and the hitch frame. You might want to consider adding some additional braces for the 3 point to take some of the stress off of the drawbar hitch frame. The 60 Pwr-Trol does have a lifting limit so the damage done to the hitch must be abuse while moving. A replacement aftermarket Cat II Top Link is not expensive. Maybe $25 to $30.

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