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 | plots
Join Date: Posts: 1 
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2003-02-09 48949
look to get cutter for 790 deere will it pull 6ft or is 5ft more in the game for the 790?
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| TomG
Join Date: Feb 2002 Posts: 5406 Upper Ottawa Valley 
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2003-02-10 48972
Part of the answer depends on what's being cut, how fast you want to go and the 3ph weight rating. Manufacturer web sites often list minimum HP ratings for their models. The models usually are rated in the diameter material they're rated for. The ratings are a bit conservative, and larger material can be cut by going slower or replacing a bunch of shear pins.
If I was doing it, I'd look for a cutter that just covers the rear tire tracks and stays within the manufacturer's recommended HP range. There may be models in-between 5' & 6' as well. I think that as small as gets the job done is good. Big cutters are hard on PTO clutches and extra width may not be too important.
The 3ph rating might be an issue for a larger cutter. The full 3ph rating can't be used to carry a cutter because they extend further back from the link pins than most implements.
....
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| BillBass
Join Date: Feb 2002 Posts: 190 North Texas
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2003-02-10 48973
I couldn't find any specs. on the 790. I run a 6' rotary cutter behind my JD 950. It has 27 PTO hp. It runs the 6 footer OK but it is at the upper limit. If I get into tall heavy grass, it cuts it ok but I have to slow down quite a bit. Otherwise it does fine. ....
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| George in VT
Join Date: Jul 2003 Posts: 12 Monkton, VT
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2003-02-10 48976
Like TomG said, it depends on what is being cut. I have a 4300 with 29 pto hp. I cut in the woods and my fields have a lot of obsticles. In my case I went with the 5 footer. My tire width is 5 1/2 feet so I wanted to keep it inside my tires to aid in manuvering. With the decrease in size, I have plenty of power, to pickup the stuff my tires run over, on the next pass. Good luck and I know there are plenty of old threads on this same thing. One of them was from me when I was in your position. ....
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 | Peters
Join Date: Feb 2002 Posts: 3034 Northern AL
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2003-02-10 49002
The hydraulics on the 790 are a little weak so it might depend on the weight of the 6ft. I definitely would not expect it to handle a heavy duty 6ft well.
Peters ....
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| Jim on Timberridge
Join Date: Jul 2003 Posts: 172 La Crosse WI
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2003-02-10 49010
A 6ft'r is too big for your tractor if you have any hills, slopes, or drag on the mower. In fact, it's just too big period.
jim ....
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 | DRankin
Join Date: Jan 2000 Posts: 5116 Northern Nevada
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2003-02-10 49015
Plotz, Jim is right. My handy dandy Gummint Guide to Green Tractors sez the 790 is rated for the 413 and the 513 rotary cutters. It has a "N" next to the 613. ....
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 | plots1
Join Date: Jul 2003 Posts: 563 mo 
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2003-02-27 50204
some say that a 4 foot is easer on machine than 5 foot , can someone help me understand that better. i was told by dealer that i should run at 2600 rpm using 513 cutter that is 5ft on my 790, can you run 4ft at lower rpm , if not how is that easer on machine. ....
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 | Billy
Join Date: Oct 1999 Posts: 975 Southeast Oklahoma 
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2003-02-27 50205
plots1,
Most rotary cutters are designed to run at 540 RPM at the PTO. Your JD achieves this when it's running at 2600 RPM.
The reason a 4 ft is easier on the tractor than a 5 ft is you're cutting less with the 4 ft. Cutting less = less force on the PTO. I wouldn't worry about using a 5 ft on your tractor. It's not going to hurt a thing.
Billy ....
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| Peters
Join Date: Feb 2002 Posts: 3034 Northern AL
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2003-02-27 50215
I had a 4ft on my JD750 with turf tires, same tractor frame no HP. It was not wide enough to cover the track of the rear wheels. After passing over the grass twice it was very difficult to get it to pick up.
With the HP of the 790 it will spin the 6ft but the hydraulics are a little weak for the weight (810 lb). For comparision the 4310 is 2200 lb. I tested a 6ft on my 955 last summer and found it would work the unit but the weight and weight distribution and the lightness of the machine >2000lb made it unpracticable for all but the smoothest ground. ....
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