Want to build an 80 inch hydraulic tiller

[J_J]

Renze ,

He doesn't have a Woods tiller, he wants something similar. And yes they do make tiller blades that will cut/till in both directions.

 

[SpecElim]

Correct I do not have any tillers for a tractor I am trying to make one and it just seems cheaper and much more simple to work with a hydraulic pump and motor. If you guys insist that a pto gearbox/shafts can be as easy/cheap then I may go that route but my budget is about $1000 including steel. My estimate for a hydraulic pto pump and a 15 cu in motor is about $600 from northern tool.

 

[Renze]

My estimate for a hydraulic pto pump and a 15 cu in motor is about $600 from northern tool.

Ok, the cheapest hydraulic pump and motor might be cheap. But what about the hydraulic hoses ? cardan shaft ? steel ? tiller shaft main bearings ? With only that, you'll be over your budget.

I'd try to find something in the scrapyard. A good gearbox, chain and sprockets.
Preferrably a used tiller, because a full set of blades isnt cheap either.
Believe me, building machinery from scratch when a mass product is readily available, wont save you money when using new parts, you just might be able to break even. If you use used parts, and have access to the right tools and machinery (relations with people in welding shops) you might be able to save some money, but usually these projects run way over the budget... Believe me, i have too many of these

Just my advice: Buy a used piece of equipment to get a jumpstart with this inversed rotation tiller.. And think once again before you start chopping it up

 

[SpecElim]

You are correct. I am looking for scrap but my local scrap yard does not have anything for a tractor. They love to cut whatever they get right when it comes in. If you can convince me that I can build a pto driven one for about the same as a hydraulic one please go right ahead. I am working on a 3d model as we speak and will post it within the next hour. Thanks, Matt.

Quick change of plans. I am going to use a 1-1/8" x 76-1/2" square disk axle from agri supply as my main shaft. This way the replacement shafts/ bearings are very cheap. I can weld the tines straight to the shaft. when they need to be replaced I can cut them off and reweld new ones.

 

[Renze]

This way the replacement shafts/ bearings are very cheap. I can weld the tines straight to the shaft. when they need to be replaced I can cut them off and reweld new ones.

Have you thought about the balancing issue ?

 

[powerstroke444e]

A complete set of blades for my howard tiller cost around $500 last time I ordered them to the best of my memory. I will build about anything but 80"tiller heavy duty? You will have more time in getting the shaft and bearings put together than than its worth, never mind the cost of the steel.
Go find a used howard 60" and I bet it if you put it all the way down you can kill your 60+hp tractor. As I have put it on the back of a 4020 deere and made it cry for mercy. The Kubota M5400 does ok with it but only in low gear when grinding roads.

 

[SpecElim]

Here are some of my basic Drawings.

RapidShare: Easy Filehosting
RapidShare: Easy Filehosting

Thanks

 

[radman1]

My Bobcat 68" tiller is run at 19 gpm. I can easily stop it when tilling and not in tough conditions. The tiller is chain driven from the hydraulic motor. If I use my pto driven tiller on my Toolcat, I can use my hi flow hydraulics to run the pto (hydraulic motor) and that produces 28 gpm at 3000 psi. Again I can stop the rear mounted pto driven 72" tiller rather easily in moderate to hard conditions. My JD 3720 with 44 hp engine, can handle the rear pto driven 72" tiller much better in hard conditions and will make the slip clutch activate. If you want a HD hydraulic operated tiller, you will need much more flow than 28 gpm and probably need 40-50 gpm for 80" tiller. With that much flow, you will need an expensive pump, oil cooler, oil reservoir, big hydraulic hoses in the 1" size ect.
Forget the hydraulic approach for running the tiller, too much inefficiency with hydraulics unless you have lots of flow and/or pressure. This link may help you convert hydraulic flow/pressure to horsepower.

Hydraulic Motor Calculator
Baum Hydraulics Corp :: Spec Calculator

 

[kennyd]

Where are you located?

 

[joes_427_vette]

The $1600.00 King Kutter tiller is sounding cheaper by the post. I don't think one can build a 6' tiller any cheaper than the production models. Replacement parts may be an issue down the road as production items are available and one of runs from a surplus center may not. Of course everyone needs therapy... and this project would keep you busy for a long time. Good luck, keep us posted on the progress.