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1200A Secondary Cap Screw

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Coachlarry
Join Date: Apr 2016
Posts: 57 Southern californai
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2016-04-25          195031


Sorry to post this in Gator forum, but I think the part number is the same for both vehicles. While troubleshooting some wobble in the driven, I noticed the set screw head was not where it should be. After removing unit, I saw the cal screw had brown off in the shaft. I want to extract it, but want to make sure it's left hand thread before I tap it. The parts diagra,s for both gator and 1200a show same part number, but only one has left hand thread in description. I would assume it's LH but thought I might ask here to be sire. Also, does anyone know the length of the screw? And bushing dimensions?

Thanks
coach Larry

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1200A Secondary Cap Screw

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Coachlarry
Join Date: Apr 2016
Posts: 57 Southern californai
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2016-04-25          195032


....

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1200A Secondary Cap Screw

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gatoraider
Join Date: Nov 2008
Posts: 540 Maryland
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2016-04-25          195033


The picture looks like an 8mm bolt. They were 8mm up to sn130445 then they went to 10mm. 8mm is a LH thread and that's normally why they are twisted off, 10mm bolts are RH thread. PN 119394 for bolt and PN128560 for bushing if it is 8mm. Same as the early 4x2s. ....

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1200A Secondary Cap Screw

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Coachlarry
Join Date: Apr 2016
Posts: 57 Southern californai
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster

2016-04-25          195035


Quote:
Originally Posted by gatoraider | view 195033
The picture looks like an 8mm bolt. They were 8mm up to sn130445 then they went to 10mm. 8mm is a LH thread and that's normally why they are twisted o ...


Yes, it's 8mm, and sorry for all the typos in my OP. Thanks for deciphering it. Ok, I will tap it and hope I can get it out of there. Thanks again. ....

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1200A Secondary Cap Screw

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Trainpilot
Join Date: Mar 2015
Posts: 67 Ukiah, CA
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2016-04-25          195038


I'm not sure if you've tried this yet, but if the bolt broke because of tension and is not bottomed out, you might try a couple of easy tricks. If you know which way the bolt needs to turn to come out, sometimes a pin punch or nail set can be used to dimple what's left of the bolt and turn it until it can be grabbed with pliers. Sometimes it takes surprisingly little torque to tap the bolt around. A little heat to the end of the shaft could help too, as this will increase clearances as the shaft will expand first. Not too much though, as you don't want to ruin temper of shaft or melt seal. Even a bit from a propane soldering torch can help. Another old and useful trick is, when the shaft is hot, hold a bit of beeswax against the stuck bolt or into the bore. It will sweat into the threads and make removal easier regardless of whether tapping with punch or easy out or whatever. ....

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1200A Secondary Cap Screw

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Coachlarry
Join Date: Apr 2016
Posts: 57 Southern californai
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster

2016-04-25          195039


Quote:
Originally Posted by Trainpilot | view 195038
I'm not sure if you've tried this yet, but if the bolt broke because of tension and is not bottomed out, you might try a pin punch or nail set p. Another old and useful trick is, when the shaft is hot, hold a bit of beeswax against the stuck bolt or into the bore. It will sweat into the threads and make removal easier regardless of whether tapping with punch or easy out or whatever.


Thanks for your post Trainpilot. I will try using the pin punch trick with a bit of heat. I bought the new Deere cap screw and it has red loctite on it, so might be a little tough if its a stock screw in there. Have never used the beeswax trick; thanks for that. My plan is to drill and tap, using a hex bolt to remove if I cannot do it with the punch.. ....

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1200A Secondary Cap Screw

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Trainpilot
Join Date: Mar 2015
Posts: 67 Ukiah, CA
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2016-04-25          195040


Good Luck Coach!

I learned the beeswax trick from a retired Granite Construction heavy equipment mechanic. It works surprisingly well--great for frozen studs and such. Consider right-hand or left-hand drills, depending on which way the screw needs to come out. Often times with broken bolts, the drill will bind a bit as it starts to go through the bolt and will spin the bolt out. So you want to use a lh bit to extract rh screws and rh bits to extract lh screws. Of course if the bolt is bottomed out hard or loctited in it gets more difficult. ....

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1200A Secondary Cap Screw

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Coachlarry
Join Date: Apr 2016
Posts: 57 Southern californai
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster

2016-04-26          195045


Unfortunately, I broke my first tap while nearly done tapping a 6/32 thread. Now I have an 8mm LH bolt with a broken 6/32 hardware-store (junk) tap broken off just below the surface. I really don want to take the transaxle off the machine if I can help it, but not sure I can get this little tap out. Big bummer.. ....

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1200A Secondary Cap Screw

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Trainpilot
Join Date: Mar 2015
Posts: 67 Ukiah, CA
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2016-04-26          195051


I've been down that road a few times myself. Have you got an oxy/actelylene set? If the tap is broken below hole you drilled into original bolt, you might be able to put on your smallest tip and heat just the tap. Put the flame into one flute and let it out other. If you can get it red hot and let it cool down slowly, it'll lose its temper, and drilling will be much easier. Your initial hole should help keep drill centered. I'd go for a carbide, or the best bit you can find, bigger than before, and try drilling again. Have you ever used a Helicoil? They will let you drill out original hole oversize, then tap and screw new threads into bore. In the end, the broken bolt mostly just keeps clutch onto splined shaft. You could also drill bigger and tap for 10mm. ....

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1200A Secondary Cap Screw

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Coachlarry
Join Date: Apr 2016
Posts: 57 Southern californai
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2016-04-26          195054


Mapp gas is the hottest I have on site, and the tip is just a standard soldering tip. I suppose I can try to be precise and hopefully make it brittle enough to punch or drill. If that doesn't work, I'll try a carbide bit and increase to 8/32. Should I go dry or wet n drilling new hole with tap in. Other than that, looks like a long day of taking transaxle off and putting the shaft in the mill. ....

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1200A Secondary Cap Screw

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Trainpilot
Join Date: Mar 2015
Posts: 67 Ukiah, CA
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2016-04-26          195057


The heat with slow cooling would more likely make tap softer to drill. I don't think Mapp with air and solder tip would do it. Maybe carbide pointed die grinder at first to give smooth start for drill bit. I've always had best luck with coolant/lubricant when drilling. I think if you can get tap out, your best bet would be to drill shaft up to size required for 10mm (or close US equivalent) tap for new threads and new larger bolt. I'll be impressed if you can save original threads at this point, but I'm pulling for you. If you have access to machine tools, could you make a sleeve that would guide a good end mill down middle of shaft? Just a thought. I've used slightly larger end mills and a higher speed hand drill in the field. Broken a few, but also solved a few problems too. ....

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1200A Secondary Cap Screw

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Coachlarry
Join Date: Apr 2016
Posts: 57 Southern californai
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2016-04-27          195061


Success! Oh man I was on my last ditch effort. I broke two carbide bits and had only made small headway. I decided to try hammering a flat blade bit into the mess and it caught some traction. You can see what happened next. ....

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1200A Secondary Cap Screw

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Coachlarry
Join Date: Apr 2016
Posts: 57 Southern californai
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster

2016-04-27          195062


....

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____________________________________________________________________________________
1200A Secondary Cap Screw

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Coachlarry
Join Date: Apr 2016
Posts: 57 Southern californai
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster

2016-04-27          195063


....

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____________________________________________________________________________________
1200A Secondary Cap Screw

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Trainpilot
Join Date: Mar 2015
Posts: 67 Ukiah, CA
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster

2016-04-28          195069


That's great. It's always nice to hear success stories. I see you also have one of my favorite models of Vice Grips. ....

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1200A Secondary Cap Screw

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Coachlarry
Join Date: Apr 2016
Posts: 57 Southern californai
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster

2016-04-28          195070


Quote:
Originally Posted by Trainpilot | view 195069
That's great. I see you also have one of my favorite models of Vice Grips.


That's one my most used tools. Hard to believe it's not more popular. Thanks for your help TP. ....

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