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JD KBA-7-10 Disk


 
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David8686
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PostPosted: Wed May 01, 2013 3:32 pm    Post subject: JD KBA-7-10 Disk Reply to specific post Reply with quote

I have a JD KBA-7-10 disk, new to me. I have used it for about 8 hours. After 8 hours one of the front disk gangs stopped turning. It turns until it encounters corn stalks or resistance and then stops turning, while debris gets pushed in a pile in front of the gang. The only zerk fittings on the disk are on the wheel cross bar and on one wheel. I can easily turn the gang by hand, as I can the other three. I found a manual online, but it does not contain a troubleshooting section. What caused the gang to not work properly and what can I do to fix it? And, should the disk gangs have grease fittings?
 
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Tx Jim
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PostPosted: Wed May 01, 2013 4:39 pm    Post subject: Re: JD KBA-7-10 Disk Reply to specific post Reply with quote

David8686 wrote:
(quoted from post at 19:32:38 05/01/13) And, should the disk gangs have grease fittings?


I'll bet your disk has iron brgs that require greasing frequently. Look for hole that grease zert(parts key #18) has fallen out of. If disk was assembled correctly the grease zert will be pointing towards the rear of harrow.
 


Last edited by Tx Jim on Wed May 01, 2013 4:57 pm; edited 2 times in total
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RandyB(MI)
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PostPosted: Wed May 01, 2013 6:07 pm    Post subject: Re: JD KBA-7-10 Disk Reply to specific post Reply with quote

I have an original op manual for that if interested my e-mail is open. Sounds like it is cocking back against the mud scrappers or the bearing is so worn it is letting the axle cock out of line and jamb up. That is the only thing I can think of that would still let you manually turn the discs but still jamb to a stop in the dirt.
 
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David8686
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PostPosted: Thu May 02, 2013 6:50 am    Post subject: Re: JD KBA-7-10 Disk Reply to specific post Reply with quote

Thank you. I cleared away pent up dirt and found the grease fittings. I greased the bearings good and gave it another try, but the one gang still stops turning when it encounters resistance. Some of the scrapers rub on their disks, so next I'm going to remove those scrapers to see if that makes a difference.
 
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Leroy
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PostPosted: Thu May 02, 2013 11:54 am    Post subject: Re: JD KBA-7-10 Disk Reply to specific post Reply with quote

It will.
 
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rustyfarmall
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PostPosted: Thu May 02, 2013 1:15 pm    Post subject: Re: JD KBA-7-10 Disk Reply to specific post Reply with quote

David8686 wrote:
(quoted from post at 07:50:12 05/02/13) Thank you. I cleared away pent up dirt and found the grease fittings. I greased the bearings good and gave it another try, but the one gang still stops turning when it encounters resistance. Some of the scrapers rub on their disks, so next I'm going to remove those scrapers to see if that makes a difference.


Those scrapers should be adjustable. You can move them either closer to, or further from the blade. If you remove them, you will quickly realize why they are there.
 
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JD Seller
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PostPosted: Fri May 03, 2013 2:11 am    Post subject: Re: JD KBA-7-10 Disk Reply to specific post Reply with quote

The other guys have you covered on the grease zerks issue. The only other thing I can think of is that your blades are worn too small. If they are too small in diameter they will push stuff rather than roll over it and cut it. So what diameter are your blades???
 
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David8686
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PostPosted: Fri May 03, 2013 2:34 pm    Post subject: Re: JD KBA-7-10 Disk Reply to specific post Reply with quote

JD Seller you asked "So what diameter are your blades???" Good question; you may have identified the problem. The rear blades are 17" and the front blades are 15". I believe the original equipment blades were 20" and 18" respectively, so the blades are worn 3" smaller than the original ones. Replacing the blades may cost me more than the $600 I paid for the disk. I'll check into that. Thank you for your help.
 
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RandyB(MI)
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PostPosted: Fri May 03, 2013 5:49 pm    Post subject: Re: JD KBA-7-10 Disk Reply to specific post Reply with quote

I have run pull type discs with 11-12" disc dia with no problem with sliding. That being said , though , if you are running weighted and in light loam/sand up to the axle shafts it might slide,BUT all of them would do it not just one gang. Check that gang against the others as far as spacers and cones on either side of the bearings and if it has them and if they are installed the right way. ALSO, straighten out the angles of the gangs and does that one still slide?. Might be missing or broken spacer/cone letting gang slide endwise when angled and under longitudinal thrust.
 
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Leroy
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PostPosted: Sat May 04, 2013 4:32 am    Post subject: Re: JD KBA-7-10 Disk Reply to specific post Reply with quote

And that disk 16" was normal with 18" on some and common to be worn down less than 15" but the 16" will not do as good a work as the 18" but were sold by price as they were cheaper and at one time it was though that 16" blades cut better and pulled easier than the 18" but that is opposite of fact. Now I do not know if there would be frame clearance for a 20" blade and they are thicker so you might have a problem getting them in because the bearing spacing is fixed and then total axle length might be a problem as well. Orignal blades were probably 11 guage, current replacement 9 guage and 20" would be 7 guage. The thicker the blade the more weight it needs to cut.
 
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