John Deere JD 2520 with 72 inch mid mower: John Deere Review  -- John Deere Tractors Discussion Forum and Review John Deere JD 2520 with 72 inch mid mower: John Deere Review -- John Deere Tractors Discussion Forum

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 07-02-2007, 14:57 Post: 143365
nosteiner4me



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 John Deere JD 2520 with 72 inch mid mower

Just left a dealer that hesitated for a minute with me wanting to put a 72 inch mid mower on a 2520 machine. He said that i may want to jump to the 3120 with the extra 3 hp, but the machine just looks too big for my 4 acres of just mowing, not brush hogging. He said it would "probably" be fine with the 20pto hp for the 2520 as long as not too tall of grass. Would i be putting too much strain on the 26.5 hp engine to run a 72 inch deck or would it be ok. My acreage is a weed grass mix, but looks great when mowed. Also could not find anywhere on the 2520 as to ground speed it can travel in high, any ideas? 10mph or so?






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 07-02-2007, 15:14 Post: 143367
earthwrks

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 John Deere JD 2520 with 72 inch mid mower

You should be fine. I have a New Holland TC33D 33 hp (brake) 27 hp (PTO) and can brushhog 6' tall, fine grass and weeds---even 3" trees with no problem. A finish mower will see even much less "abuse" than that. My ground speed in high range is 17 mph---but trust me---unless your yard is smooth as glass you won't be flying around your yard unless you have a good chiropractor.






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 07-02-2007, 16:14 Post: 143370
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 John Deere JD 2520 with 72 inch mid mower

EW, height and width are not the same for normal people. Smile

I have about the same size Kubota in a B series and just happen to cut grass with it Saturday with a 72" RFM. Boy did it have it's hands full. The grass was thick due to a lot of recent rain and the temp ran toward he upper end of the normal range even at 5 MPH (max speed in mid range). Now when I got to the normal not thick grass I could have cut it in high range and been fine. kt






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 07-02-2007, 16:48 Post: 143373
nosteiner4me



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 John Deere JD 2520 with 72 inch mid mower

kthompson/earthwrks...The dealer did not have a 72 inch mid mount mower and would have to order one. He said i could demo the loader and tractor....... but maybe i need to demo the 72inch mid mount mower to be sure it can handle 4 acres. Now you used a rearmount 72 inch deck? Isn't the rpm of the rear pto different (slower) than the mid pto and that could be the poor performance in wet grass or the b series kubota you were using was 24hp or less?. I think i need to demo the 2520 with the 72 inch mower and want it to mow faster than 5mph for sure, it is nice and flat, It should handle it but at $20,000 plus or so with loader it better.






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 07-02-2007, 18:57 Post: 143375
Chief



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 John Deere JD 2520 with 72 inch mid mower

A 72" MMM is too much mower for a 2520 in my opinion. Can the 2520 cut grass with a 72" MMM? Yes, but the engine will be taxed much more than with a 60" or smaller MMM. The mid pto turns at a MUCH higher speed than the rear pto. 2100 rpm mid vs. 540 rpm rear. The engine actually works harder to turn the mid pto under most circumstances due to the much higher gear ratio. In moderate to heavy turf the load on the engine will only get worse. Not a good idea to match components on your tractor that run the engine at its max or near max power on a regular basis. Deere lists the 72" MMM deck as being compatible with the 2520 and it should cut OK provided you are not trying to mower over grown, thick, or heavy turf vegetation. The 72" MMM will be more prone to scalping as well as being a little more difficult to install and remove than the 62D On Ramp MMM, not to mention manueverability with respect to trimming in close around obstacles on the lawn. Be advised that the 72" MMM that Deere lists as being compatible is NOT the 72" 7 Iron MMM but a MUCH lighter duty MMM that I think you will be disappointed with. I would go with the 62D On Ramp MMM. I don't think the 62D is 7 gauge construction either but it is the MMM designed for this series machines and a much better fit in my opinion.

I have the 72" 7 Iron MMM on my Deere 4410 and it takes ALL of the 29 pto hp to run this mower in heavy turf when finish mowing my fields and pond area. It is a great mower but I think MMM this width would be a bit much in some circumstances for your 2520.






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 07-02-2007, 19:24 Post: 143376
JasonR



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 John Deere JD 2520 with 72 inch mid mower

Slightly off topic (or at least the initial question)...

I don't own a 3PH rear mower, but I am curious if they have a gearbox on them such that the blade speed (at 540RPM) is the same of a MMM (at 2100RPM). When I set up my MMM to run off the back, my drivetrain added a 1:4 ratio, so the blade speed was close to the MMM speed.

- Jason






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 07-02-2007, 20:08 Post: 143379
earthwrks

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 John Deere JD 2520 with 72 inch mid mower

Jason can you elaborate on the MMM mounted on the rear as far as RPM's. On the face of it, it would seem that your RM MMM had a speed reduction of 1/4 if you directly connected the MMM PTO shaft to the 540 PTO.






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 07-02-2007, 20:16 Post: 143380
candoarms



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 John Deere JD 2520 with 72 inch mid mower

JasonR,

The gearbox on the rear mounted bush mower is likely a 1:1 ratio. It is not geared up.

The rear mount mower uses a single blade, with a very large diameter, which increases the blade tip speed tremendously.

The mid-mount mower uses three (or more) smaller blades, which doesn't provide much blade tip speed. The only way to increase blade tip speed on the MMM is to increase the PTO shaft's RPM. Doing this, however, decreases the amount of torque supplied by the tractor, by a factor of about 4.

The difference between the mowers in the length of the blade on the Brush Mower. At five feet in length, or more, and spinning at 540 RPM, the blade's tip speed is incredible.

Joel






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 07-02-2007, 23:34 Post: 143384
JasonR



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 John Deere JD 2520 with 72 inch mid mower

earthwrks - the rear pto turns a shaft with a large dia. pulley, which in turn drives a smaller dia. pulley (this pully is the pivot point for the ditch mower) and the pivot pully turns a slightly smaller pulley mounted to the original gearbox on the MMM (where the MM PTO used to hook up)

candoarms - thanks, I never checked one out






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 07-02-2007, 23:55 Post: 143386
DRankin



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 John Deere JD 2520 with 72 inch mid mower

Not all rear mount mowers are "brush hogs". My RMM has three overlapping blades just like a MMM.






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Discussion Boards > Active Subjects > Messages as Posted > John Deere Review Forum

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candoarms 2 | Chief 1 | DRankin 2 | earthwrks 2 | hardwood 5 | JasonR 2 | kthompson 4 | Murf 2 | nosteiner4me 7 | whiteturbo 2 |




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