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Discussion Starter #1
Hey everybody! I am in the market for a King Kutter box blade. Really only looking at the King Kutter because of the price, and others I have talked to said they were happy with the purchase. They seem to be built well enough. Anyway I have searched the internet high and low on whether to go with a 5' or 6' model. My dealer recommends a 5 footer. He claims a 6' blade with the rippers down will stop my tractor in its tracks. I DO have loader tires which should help. Just asking for some more advice before pulling the trigger. I would rather have a 6' model. Makes it a lot easier getting the blade close to an edge. The 5' blade will just barely cover the tracks (maybe). I would hate to buy a 6 foot blade just to find my tractor can't handle it. I am a professional landscaper and it will mostly be used to grade loose topsoil and the occasional breaking up soil with rippers before leveling it out. Thanks for the help.
 

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Being it is going to mostly be used to moving/spreading loose material make sure it will cover the tracks of the tractor easily.

And for using the scarfiers - with a bigger box blade you can always use just a couple at a time and make a couple passes. You don’t have to have all of them down all the way all the time. That is why they all have adjustments in them.
 

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I use a 6' box blade with my 3520 (the model before your 3039) and the tractor has zero issues with it. I do whatever I want with it and never once worried that my tractor couldn't handle it. I am really curious as to why your dealer told you that. I believe even in the John Deere implement brochures it lists the 3520 as a compatible tractor with a 6' box blade.
 

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A lot has to do with how heavy the box is and the type of ripping actuator it has as well as the type of ground and moisture content. You put a 65"-72" box that weighs 800lbs-1000lbs and rippers that can go into the ground 10" and I guarantee you that there are times when the tractor will come to a complete stop.

As far as a KK box, just get the professional grade 72" unit and be happy.
 

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Discussion Starter #7
Thanks for all the great input! I did have a typo in my original post. It says I have LOADER tires...what I meant to say was LOADED. I would think the increased traction from the weight of the fluid would also help. I pull a 6 foot soil pulverizer all the time. They don't fill with dirt like a box blade, but it will put a load on the tractor when you hit undisturbed soil. I'm going to pull the trigger on a 6 footer. Thanks again!
 

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Thanks for all the great input! I did have a typo in my original post. It says I have LOADER tires...what I meant to say was LOADED. I would think the increased traction from the weight of the fluid would also help. I pull a 6 foot soil pulverizer all the time. They don't fill with dirt like a box blade, but it will put a load on the tractor when you hit undisturbed soil. I'm going to pull the trigger on a 6 footer. Thanks again!
I don't think you will be disappointed with your choice. I have used 5' box blades with my 3520 and in my opinion, they are not wide enough. Granted I do not have the heaviest 6' box blade available, what I do have isn't light either. My tractor has no issues with the box fully loaded with gravel or soil. It doesn't have problems with all of the scarifiers being in their deepest position either. I have no doubts if I was in B range the tractor would lug and obviously there is no reason to be in C range but the tractor handles it while in A range like a champ. Really, I'm confident under most circumstances for what I use a box blade for the tractor is capable of handling bigger. I wouldn't buy bigger and feel 6' is the appropriate size but often the tractor could handle more.
 

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I have a Frontier 5 foot box blade with scarifiers. I pull it with my 2038R. No problems, unless I hit a big root or big rock, but that would cause any tractor problems. I believe Joe pulls a 6 foot Frontier with his 2038, says it does fine. I went with the 5 footer because my land is hilly and steep in some places. Pulling up a steep hill changes everything. I think with your heavier tractor and increased torque over mine and Joes, you will be fine with the 6 footer.
 

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Discussion Starter #10
Thank you everyone for the feedback and useful advice! I picked up a 6 foot King Kutter this weekend. I know the build quality can sometimes be sketchy. I looked it over good and I have to say build wise it looks great. First impression....I'm impressed with the construction it is very solid and heavy. Has the heavy duty clevis type mounting for the 3 point arms, curved reversible cutting blades front and back. Only issue is scratched up paint from the lack of care rural king shows with a fork lift. I don't really care though since it will be getting painted green anyway. After some heavy use over the weekend I am sure glad I listened and went 6 Foot. With all five rippers down and the box almost full to the back tires (I wanted to see if I would spin out) I had no problems what so ever in 4x4. The rpm's would go up and as soon as you heard the turbo whistle it was like you weren't even pulling anything. Overall very impressed with the blade and the 3039! Thanks again!
 

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I wouldnt think a 6' box blade with all the chisels in the ground would be any more than a couple of turn plows. I know for sure a 38hp tractor will handle two plows.
 

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I can't imagine a 6' box blade being an issue with your tractor. I wouldn't hesitate to buy it. Your dealer saying a 6' blade would stop your tractor in its tracks is almost laughable.

Perhaps if you dropped all the scarifiers at max depth in extremely well compacted gravel, and had the box heaping with gravel? :dunno:
 

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For what its worth, I have a 5' blade for my 32hp 2032r and when the box is full of material its all she can handle, have to run full rpm in 4x4, low gear, and a walking pace. Anything else will bog it.

When ripping it does pretty good as long as I'm just ripping and not collecting material (bring top link all the way in).

Is 6 inches on either side going to make any sort of meaningful difference for you? As long as the 5' covers your tracks, I'd say do that.
 

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Discussion Starter #14
Perhaps if you dropped all the scarifiers at max depth in extremely well compacted gravel, and had the box heaping with gravel? :dunno:
I am sure there would be scenarios that would spin the tractor out. I was simply concerned with the amount of scarifiers and the weight of the box, and whether it would be to much for the 3039r. I have a decent size rock parking area I almost tried it on, but it is smooth and packed nice and I didn't really want to mess it up.
 
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