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how would ya repair this?

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tn terry t

05-09-2008 19:11:29

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this aint the right picture but you can get the jest of things. on a 560 that #8 has three 7/8 x13/4 bolts that hold it to the tractor all three bolts holes are stripped. some time in the past someone had put heli coils in them . is there enough "meat" there to drill them out to 1" or what would you do if you where in my shoes

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slowfolk

05-10-2008 08:58:33

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Re: how would ya repair this? in reply to tn terry t, 05-09-2008 19:11:29

However you decide to make the repair be sure you use a good grade of bolt to hold the bracket onto the tractor or you will have the same problem.

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dansuper27

05-10-2008 08:27:02

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Re: how would ya repair this? in reply to tn terry t, 05-09-2008 19:11:29

You need to post a picture of the place on the tractor that this bolts on. I would say that if this area of the casting was built to take the stress of this bracket then going to the next size bolt would not be a problem. I would like to know whats on the other side of the bolt hole to determine if you can drill the holes all the way thru the casting to get more thread securing the bracket. I'm guessing this would be in the transmission area but then you have all the thread you can get or better yet if you can get to the back side and put in a bolt and nut you would never have to revisit this problem. This is one of those fixes you don't do half way.....you do it the best way there is so it doesn't happen again because you can't keep stepping up the bolt size. I do like the inserts so that would be a good option if the metal is there to secure them.

Dan

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tn terry t

05-10-2008 07:16:03

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Re: how would ya repair this? in reply to 658834, 05-09-2008 19:11:29

thank you guys i want to go with the keenserts but didnt know if there was enough metal there to drill for the 7/8 insert i dont care for the helicoils much

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El Toro

05-10-2008 07:51:43

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Re: how would ya repair this? in reply to tn terry t, 05-10-2008 07:16:03

We used those keenserts in aluminum plates for 1-inch bolts and they're very durable. Should be even better on your tractor. Hal

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the tractor vet

05-10-2008 06:50:43

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Re: how would ya repair this? in reply to tn terry t, 05-09-2008 19:11:29

Myself i do not like heli coils and have had far better luck with a product called Keen Serts . They need nothing fancy to install just the standard drill bit and a standard tap , then ya screw them in and use the tool for that insert and set the locks and use a standard bolt . They will hold more then the factory threads . Had to do that to a 706 i had when i pulled the hitch out from under it while plowing .

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teddy52food

05-10-2008 06:47:20

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Re: how would ya repair this? in reply to tn terry t, 05-09-2008 19:11:29

Years ago that was a common problem. John Deere had studs that were oversized on one end. I put them in as deep as they would go and put the bracket on with nuts. Then if you look on each side of that casting, there are 2 tapped holes on each side. I fabricated some heavy strap irons to bolt on the sides and welded them to the bracket. After repairing them this way, they never came loose again.

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Allan from PA

05-10-2008 06:45:07

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Re: how would ya repair this? in reply to tn terry t, 05-09-2008 19:11:29

There are twinsert heli-coils that put a heli-coil inside another heli-coil where you do not have to take out any parent metal and you may be able to go back to the original bolt size.

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charles todd

05-09-2008 21:38:36

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Re: how would ya repair this? in reply to tn terry t, 05-09-2008 19:11:29

LOCTITE 660 Quick Metal might work it there are some decent threads left. This material is anerobic (cures in absense of air, like a bolt & thread), similar to thread lockers. Its purpose is to rebuild worn shafts, slip fit bearing surfaces, worn/ elongated keyways, stripped bolts ect. Try GOOGLE for "loctite 660" and the first 3 or 4 pages are prety relevent and describe its uses. Industrial supply companies, bearing shops, and the like should carry this if they sell other loctite products.

Charles

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Janicholson

05-09-2008 21:25:49

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Re: how would ya repair this? in reply to tn terry t, 05-09-2008 19:11:29

7/8" to 1" is 1/16" on a side. That is not enough "meat". Thread inserts that are for 1" bolts, Will take the holes out to the appropriate thread depth. They could be heli coil, or other solid insert.
Do not drill too deep, and you may need to bottom tap the hole to get sufficient thread to form, while not drilling into the oil. Use locktite on the insert, and on the bolts. JimN

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tn terry t

05-09-2008 20:25:37

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Re: how would ya repair this? in reply to 658834, 05-09-2008 19:11:29

HENRY E NC said: (quoted from post at 23:22:34 05/09/08) I have had some luck with JB Weld on rethreading larger bolt hole. Coat the walls of the bolt hole with the epoxy and then lightly grease the bolts and screw them in and then out. Let the epoxy set for at least two days before stressing it. Nuff said Henry

i just want everyone to realize that those three bolts are the anchor point for the fasthitch

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HENRY E NC

05-09-2008 20:22:34

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Re: how would ya repair this? in reply to tn terry t, 05-09-2008 19:11:29

I have had some luck with JB Weld on rethreading larger bolt hole. Coat the walls of the bolt hole with the epoxy and then lightly grease the bolts and screw them in and then out. Let the epoxy set for at least two days before stressing it. Nuff said Henry

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Nebraska Kirk

05-09-2008 20:12:56

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Re: how would ya repair this? in reply to tn terry t, 05-09-2008 19:11:29

Let me preface my statements with this; I am not intimately familiar with the 560 but I do have a general knowledge of its workings.

I think that there would be enough "meat" there to drill and tap to 1" and either use helicoils or just use 1" bolts.

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tn terry t

05-09-2008 19:48:47

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Re: how would ya repair this? in reply to 658834, 05-09-2008 19:11:29

sorry there James the bolt holes are in the belly of the tractor the bolts go thru that #8 into the cast iron of the tractor

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james rumph

05-09-2008 19:44:24

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Re: how would ya repair this? in reply to tn terry t, 05-09-2008 19:11:29

Can a nut be welded there on the back side ?

Or drill them out and weld in some round stock and redrill and tap them. Find some round stock several sizes bigger so that your not drilling into the weld.

Hell drill them out and weld some grade 8 nuts in .

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Clefus

05-09-2008 19:33:26

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Re: how would ya repair this? in reply to tn terry t, 05-09-2008 19:11:29

I have had problems keeping the bolts in even with lock washers if I dont keep an eye on it once in a while.....

not sure what you should do....are the helicoils all shot??next size up may work--just maybe not any deeper....

On bracket #3 I re-welded it but it didnt hold and ended up fabricating one from 1/2" plate...has been fine since last year...

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