Flail Mower: Field Mowers Brush Cutters  -- Tractor Attachments Implements 3ph Discussion Forum and Review Flail Mower: Field Mowers Brush Cutters -- Tractor Attachments Implements 3ph Discussion Forum

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Discussion Boards > Active Subjects > Messages as Posted > Field Mowers Brush Cutters Forum

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 03-15-2010, 12:32 Post: 169240
greg_g



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Just got what might turn out to be a great deal on a Jacobsen model 78132 flail mower; rear 3-point lift, PTO drive, fixed offset, 74" cut. $150 at the monthly equipment auction over in Sikeston (MO). It's old enough so there's no Jacobsen parts support any more, but so far that's not been a problem. It was missing the PTO shaft and drive belts, and the knives are probably well past sharpening. I got new belts, new lift pins and bushings, fixed the idler, replaced some missing washers and grease zerks. And it's all lubed up and ready to be subjected to the spin test. Ordered a new PTO shaft from Agri-Supply on Saturday. So far the investment is small. The goal is to spin it up at speed to see if all the rotating parts are still true, and that the big bearings are still good. If it passes that test, I'll invest in a whole new set of knives (66 of them) and go from there. If all goes as hoped, I anticipate being able to then sell both my 84" finish mower and 72" rotary cutter.

I'm posting this on the off chance that there's any Jacobsen flail mower owners among the membership. Thought it might be nice to compare notes.

//greg//






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 03-15-2010, 13:22 Post: 169241
auerbach



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 Flail Mower

Just curious on the difference between a rotary cutter and a finish mower.






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 03-15-2010, 14:36 Post: 169245
greg_g



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Well, I'm not sure what this has to do with the flail mower topic. But a finish mower has fixed blades, and is designed to leave an esthetically pleasing result. The majority of light and medium duty finish mowers do lawn and landscape work. Mine is heavy duty enough to do pasture work. Rotary cutters on the other hand, use hinged blades that exert brute force against heavy resistance. They do the heavy/thick/tall stuff (generally up to about 3" diameter stuff) that finish mowers can't handle.

Flail mowers fall in between. Depending upon which knives they're equipped with, they're capable of a range between finish mowing and brush cutting (generally up to about 3/4" diameter stuff).

//greg//






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 03-15-2010, 17:07 Post: 169249
Murf

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Quote:
Originally Posted by greg_g | view 169240
It's old enough so there's no Jacobsen parts support any more, but so far that's not been a problem.



Are you sure? That model number still shows up in my online parts look up.

BTW, Jacobsen didn't make them, they were private labeled for them, everything you will need is still available.

If you get stuck for knives let me know, I can give you a few sources and cross-references to other compatible ones.


Best of luck.






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 03-15-2010, 18:41 Post: 169252
earthwrks

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Greg, I did the same thing you are two years ago: found a 72" flail for $100. Installed new belt, PTO shaft and bearings. Ran and cut great---until I went to turn. The roller made torpedo-like gouges everytime I turned (6 acres of rolling berms, ditches, trees and landscaping and two ponds to deal with). So I invested another couple hundred bucks making a carriage like a towable finish mower, only it was still 3-pt (got rid of the roller). Made 4 casters from an airport luggage carts from 1/2" plate and 1" grade bolts as the pivots. First time I used it I backed up like I normally would with the finish mower and bent the two rear casters --1/2" plate (design flaw perhaps). But I gave up on it and sold it for $150.

For the record not all flail mowers are "universal"---ones meant for cutting grass have blades made for it while those for cutting brush have flail hammers or choppers and not necessarily blades, per se. The nice thing about flail grass mowers is they are forgiving when the encounter an object like a stump, rock or other things that would destroy a rotary blade.






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 03-15-2010, 18:54 Post: 169253
greg_g



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Quote:
Originally Posted by Murf | view 169249
Are you sure?

Yup. Used that list to request a parts quote. Response came from an outfit called PartSpring. Clearly the machine is old enough where Jacobsen has divested itself of all in-house replacement parts. Unfortunately the PartSpring guy couldn't fill one single part number. Checked with a few other online sources, all dead ends. Have a contact within Jacobsen though, hoping for an email response from him tomorrow.

Soon as the PTO shaft arrives, I'll have everything I need to do the test firing. At that point, I'll be able to decide whether or not to invest in a new set of knives.

//greg//






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 03-15-2010, 19:13 Post: 169255
greg_g



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Originally Posted by earthwrks | view 169252
For the record not all flail mowers are "universal"

True, not all. But buy a new 71" Caroni for example, and you get a choice of three knife types.

But the point I was trying to make is that - in terms of ruggedness - flails fall between finish and rotary.
The Jacobsen parts manual shows only my model 78132 was only supplied with grass knives. Must be considered a turf machine, so is probably closer to the finish end of the scale. I'm not selling my FM or RC unless/until this flail proves itself out in the pasture.

//greg//






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 03-15-2010, 19:13 Post: 169256
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Greg very much know you are very knowledge but still wanted to point out a flail mower is really rotating at a very high rpm when run at recommend pto rpm. Sure would want to be sure the bolts and cutters on it were secure before any real run.

The point EW made sure came home for me. I solved the need on tractor with lift but ended up deciding would stick with rfm. It was mainly due to the type of blades available for the mower I was considering. Have used flail mower on boom a good bit for ditches and tree limbs and like it. If all proves well great price.






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 03-15-2010, 19:18 Post: 169257
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Originally Posted by kthompson | view 169256
wanted to point out a flail mower is really rotating at a very high rpm when run at recommend pto rpm.

Concur. This is the knive/hanger/bolt design, and I've already made sure all were tight and none were missing. Matter of fact, many of the bolts could be rusted in place. If/when I replace the knives, I'll replace the bolts too. Hangers look good though. And I definitely planned on slowly increasing PTO speed from idle while watching the reaction of the machine.

//greg//






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 03-16-2010, 14:28 Post: 169277
greg_g



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Originally Posted by Murf | view 169249
BTW, Jacobsen didn't make them, they were private labeled for them, everything you will need is still available.

Spot on Murf. Email response from Jacobsen insider today revealed that Ford made that machine for them. Just verified on the NewHolland website that it's a rebadged 74" model 917. Now to get to a NH dealer and see if they still sell parts for THAT machine.

EW - the Ford 917 parts list shows a selection of three different knife types

//greg//






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Discussion Boards > Active Subjects > Messages as Posted > Field Mowers Brush Cutters Forum

Thread 169240 Filter by Poster:
auerbach 1 | earthwrks 2 | greg_g 9 | hardwood 1 | kthompson 2 | Murf 5 |

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