Who do I believe?

[EddieWalker]

I have a 35 hp Century 4x4 tractor without a FEL. I've been cutting with a Landpride 72 inch medium duty bush hog for three years. Before I had the dozer, I would really push it to create trails and open up areas on my land. I've replaced the blades twice, the gear box, drive shaft and tail wheel once. I've abused it much worse then most people would, but when it breaks, I fix it and keep on going.

The HP is plenty for that sized mower, but the front end is a little light without a FEL. I've had the front tires come off the ground on steep hills to the point I couldn't turn. Nothing to it, I just back up and try a different angle.

The tractor handles the weight fine, but I don't know what it weighs. A bigger tractor would just be that much better.

Good luck,
Eddie

 

[JRobyn]

Hey Chuck,

I run a Bushhog 286 (962#) on my 4330 (also w/LA853 FEL) with no issues whatsoever. I have driven the rig several miles over rough gravel and dirt roads between my place and my BILs, in mid or high range, with the cutter raised and bouncing around, also with no issues whatsoever. I've also driven the same route with my 1400# chipper on - no issues. Maybe I'm just lucky, but I agree that Kubota's ratings are very conservative, and my dealer confirmed it when I asked them about the chipper.

 

[Dalhan]

Thanks for the replies all. Think I'll just go on ahead and get a Med Duty Cutter then. Everyone seems to be in agreement including my dealer who says it's under rated as well. Rhino TW72 seems to be the lighest of the bunch at 1029 lbs Aprox. Them Bush Hog 296 at 1095 lbs. Going to get one end of the month I guess so I'll post a few pics if anyone cares to view it.

Thanks again,

Chuck

 

[638]

Of course we want to see it.

ron

 

[Soundguy]

The Kubota manuals have a separate rating for the total weight of an attached implement.

Relief valve is suposed to be there to protect the cyl from a load that is too heavy to lift.

Soundguy

 

[Mike_VT]

I have an l4330 and run a 72 woods that is appx 1000lbs. No worries.

 

[Glowplug]

1) In my opinion, Kubota tends to be a bit conservative in their implement recommendations,

+2

You should be okay. 100lbs is not going to make a big difference. On my M7040 the weight limit recommendation for a box blade is 1200lbs. But I've seen plenty of people use 1500lb box blades with no problem. I'd go ahead and get either a Woods BB720 or Rhino TW72 if I were you. Just make sure you have adequate front-end ballast.

 

[N80]

Relief valve is suposed to be there to protect the cyl from a load that is too heavy to lift.Soundguy

I'm just saying what the manual says.

The parts manual for my tractor (which I don't have in front of me) shows some type of valve integral to the 3 pt lift piston (which is internal) housing. It does not call it a pressure relief valve. There is a pressure relief valve but it is on the front hydraulic block and only affects the loader as far as I can tell. This valve thingy for the 3 pt lift piston is called something like 'shock load absorber' or something to that effect and is a fairly large, complex looking thing. I'm assuming it has a function similar to a pressure relief valve but it does not appear, from the drawing, to by pass any fluid. But, I agree with you, there is obviously something there to dissipate shock loads on the 3 pt hydraulics. How much shock load can it withstand? Well, that takes me back to the manual, which appears to be very conservative. I'll look up the name of that part when I get home.

As an aside, I always assumed that single internal 3 pt lift pistons were for small, low end tractors and dual external pistons were for larger Ag and utility tractors. I was suprised to find that my farmer friends big JD (4430 or 4340, something like that) has a single internal piston. He had it all apart and I had a chance to look at it. Of course it was enormous and very stout.

 

[N80]

I looked it up. Its called the 'cyclinder safety valve'. Have no idea what it does. Again, assume its to relieve pressure in some way if there is a shock load. I can't really tell, but it might just be a simple pressure relief valve but can't tell from the drawings where it vents to. Probably back into the transmission case.

I don't know if the 4330 has an internal lift cylinder or external lift cylinders.

 

[Soundguy]

I looked it up. Its called the 'cyclinder safety valve'. Have no idea what it does. Again, assume its to relieve pressure in some way if there is a shock load. I can't really tell, but it might just be a simple pressure relief valve but can't tell from the drawings where it vents to. Probably back into the transmission case.

I don't know if the 4330 has an internal lift cylinder or external lift cylinders.

Quite possible it exhaust right into the open housing.

And yes.. external lift pistons are generally the exception.. not the rule.. even up into the 100hp tractors. my NH 7610s tractor has an internal lift piston..

Now once you get into crazy large machines.. then you never know what you will see...

Soundguy