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Implement Alley Discussion Forum

changing blades on JD disk.

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RC farms

04-04-2007 06:05:39




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I have never replaced a disk blade. I've read up on some of the archives regarding disk blades and I need to replace some for my JD 8' tandem. One gang in front has 10 - 16" blades...and they are all shot. I've been soaking the end nut and spacers or "spools" with PB blasters with hopes that will help. Map gas torch ready if needed...but once the nut is off the end will everything else slide off? Plus I assume that I need to remove what's left of the first blade to see what the mounting hole size will be...are there various shaft type and hole sizes? Thanks in advance for any and all help. I don't always get back to the board as fast as I'd like to so don't think I'm not reading or will respond.

Ron

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`Bernie in MA

04-05-2007 18:12:49




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 Re: changing blades on JD disk. in reply to RC farms, 04-04-2007 06:05:39  
One way to loosen a stubborn nut is to put a shallow crease in one of the flats with a cold chisel. This will open it up a few thousandths. You can still get a wrench on it except that flat and you can reuse the nut. If this is a rigid harrow the front disks will break going over rocks if the tractor drawbar is too low. I found the best way is hook it to the 3PH drawbar and lift it the same time as putting the wheels down. HTH

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RC farms

04-05-2007 06:16:09




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 Re: Thanks in reply to RC farms, 04-04-2007 06:05:39  
Thanks, to all of you for your feedback. I thought about getting another disk rather than replacing the disks on the one I have but unless I was lucky I might be buying someone else' probelems. This disk I have is a pull type with hyraulics and when I first got it the disk were not too bad but the one gang in the front finally went. If I bought another used disk I may be faced with the same problem of eventually having to change out some disks....so I've decided to just fix the one I have. I contacted Shoups and they have 16" disks for $13 each with free shipping...I may look at the notched disks as mentioned, but they may depend on the $$$....and as far as hiring a sailor..no need to... I was in the Navy and know all those words...but I have to watch myself now with my wife and the grandkids around ;^)

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FreeRanger

04-04-2007 14:45:57




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 Re: changing blades on JD disk. in reply to RC farms, 04-04-2007 06:05:39  
I have an old JD 8' tandem as well. I broke the outside rear disk in half (probably hit bedrock in shallow ground!) Did the same thing to an old Ferguson 8' tandem three years ago. Both are in need of the disk to be replaced.

Question: Is it really worth the effort to take on this project for either disk? Or should I just wait for another old disk to become available at auction or in the paper?

I think I paid about $150 for each. I like the fact that both are drag and not 3pt. I can add weight so they both still work OK for my place.

They are very old, I can imagine they won't come a part with out a lot of muscle.....

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ChrisLSD

04-04-2007 13:05:59




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 Re: changing blades on JD disk. in reply to RC farms, 04-04-2007 06:05:39  
this is how we did it - get the giant crescent wrench or pipe wrench (either one whichever is bigger) we did have a 24" crescent wrench that weighed as much as i did at the time - that was usually the tool of choice - - put that on the nut - put the disk down in the lawn - drive forward (or backward depnding on which nut) with the wrench on (after spreading the little tin anti spin locking type washer/plate) to loosen the nut - sometimes jumping on the pipe wrench with big pipe on it helped - still with disk in the ground -

then once we got that loose - it was just a matter of time - next we would take the bolts out of the bearings and remove the whole gang away from the rest of the dsk - so we didn't have to fight the scrapers

then once we had it out of the disk the nut and the first disk blade were easy - then comes that first spool - we have spent several days and a lot of beating along with a lot of compressed air - diesel fuel , waste oil - water - you name it we tried to use it - but we did eventually get it -

so just like on star trek - good luck scottie

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johns48jdb

04-04-2007 12:06:07




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 Re: changing blades on JD disk. in reply to RC farms, 04-04-2007 06:05:39  
have you given any thought to the type of blade your going to put back on. the notiched blades will cut better. a few taps with a hammer on the spools will jar some of the dirt loose when you start taking things apart. just lay everything out in order as you take it off. oh, yeah hiring a sailor to say words for you will help.



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55 50

04-05-2007 16:08:22




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 Re: changing blades on JD disk. in reply to johns48jdb, 04-04-2007 12:06:07  
Hey, I was in the Navy and I resent that!!! LOL



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johns48jdb

04-06-2007 14:55:49




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 Re: changing blades on JD disk. in reply to 55 50, 04-05-2007 16:08:22  
i appologize to all you sailors. i know you'll are all good guys who would never say anything off color at any time. man i hate saying that. my mom taught me to not tell lies. lol



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MLD

04-04-2007 08:25:59




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 Re: changing blades on JD disk. in reply to RC farms, 04-04-2007 06:05:39  
The nut on the end of the shaft keeps everything tight, once it is off the spools & blades should slide off with a little help. Also use the advise from the other reply about the bearings, I can't say how to work on that because I don't know what you have. Make sure when you put it back together you get it good & tight, if not, the blades can move & wear your axle out. Good luck, theres going to be some cuts & busted knuckles during this project.

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Lou

04-04-2007 07:28:53




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 Re: changing blades on JD disk. in reply to RC farms, 04-04-2007 06:05:39  
I started a rebuild on a JD disk two years ago. didnt take me long to figure out I could buy a working disk for less money and a lot less time.IMHO.



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RC farms

04-04-2007 10:19:38




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 Re: changing blades on JD disk. in reply to Lou, 04-04-2007 07:28:53  
Yes, I thought about that, but this is actually a pretty good disk, just the one gang is bad. I priced out the disk at about $120 so that's not too bad considering having to do the whole thing.



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Devin Sparks

04-04-2007 07:25:48




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 Re: changing blades on JD disk. in reply to RC farms, 04-04-2007 06:05:39  
Once you get the nut off and remove the first couple of spacers you should encounter the bearing and support. Not sure of which disc you have but you will need to loosen the bearing support. After the gang is loose you should be able to remove the blades and spacers. Just remember to put bearings back where they should be. You may need that torch to get the nut off. The bearings and blades may be hard to get off due to dirt being packed up against them over the years. Good luck and get some help with moving the gangs so that you dont hurt yourself.

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