Convert 540 PTO to 1000??

[majorwager]

Many valid points offered.

I recently chose to convert a 6 Ft MMM 2000 RPM gear box to a QA mount on the FEL. Mower would now be driven hydraulically. Cost wasn't the concern. A high speed hydraulic motor and stub drive shaft was mounted in front of existing 2000 rpm gear box.

Now for the rear PTO conversion. 540 rpm is not fast enough for any hydraulic pump. A speed increaser was purchased to obtain 2000 rpm output.

Of course tractor PTO torque is reduced by the same multiplier as the increaser and an additional mounted reservoir w/ filter, pump, pressure regulator, hoses etc were required. HP remains constant.

Two points. First, considerable expense can be realized to accomplish impractical results but some do it because they can and to prove it works.

Second point is certifying that the first above is actually worth the time, effort and expense invested .

When compared to certain romances, the answer is best held close to the vest.

 

[RickB]

Many valid points offered.

I recently chose to convert a 6 Ft MMM 2000 RPM gear box to a QA mount on the FEL. Mower would now be driven hydraulically. Cost wasn't the concern. A high speed hydraulic motor and stub drive shaft was mounted in front of existing 2000 rpm gear box.

Now for the rear PTO conversion. 540 rpm is not fast enough for any hydraulic pump. A speed increaser was purchased to obtain 2000 rpm output.

Of course tractor PTO torque is reduced by the same multiplier as the increaser and an additional mounted reservoir w/ filter, pump, pressure regulator, hoses etc were required. HP remains constant.

Two points. First, considerable expense can be realized to accomplish impractical results but some do it because they can and to prove it works.

Second point is certifying that the first above is actually worth the time, effort and expense invested .

When compared to certain romances, the answer is best held close to the vest.

One disagreement. Prince has been building purpose built hydraulic pumps that slide right over a tractor PTO shaft and develop up to 20 gpm @ 540 rpm for several decades. There are many Chinese knockoffs as well.

 

[majorwager]

Rick,
Thanks, I looked at those, CI Centers and all but I wanted 32 gpm output for future snow blower, you remember snow right? The mower will run with 26 gpm reducing tractor engine speed but still well within torque band. Thanks

The little 1620 powered this Ford mower w/ 21+ PTO hp . My pressure is at 2500, slightly more than the prince output.

Even w/ the prince reservoir ect was still necessary.

 

[sd455dan]

Simple solution: Take your PTO generator and a 1000 rpm electric motor and run the grass cutter off of electricity. Best if your genny has 3 phase outputs. If not buy one that has it with the money you are saving. Cheap 3ph electric motors are all over the place. Try not to run over the electric cable you have to run to the cutter from the genny, you could start the field on fire. Even better would be if you have a front pto and run the genny from it. You need a longer cable though, and pushing a trailer in a field can be tricky.

Another possiblity would be to use a 1000 rpm DC motor and run it off of a battery trailer. Add some solar cells and you might be able to sell power back to the electric company on a very sunny day.

I suppose you could double the length of the mower blades, too. That would get the blade tip speed up but raise heck with the mower case and shroud for the first few revolutions. (Use ear muffs and a good radio).

Why do you have to actually run it ? Just try dragging it across the field (take the wheels off, off course). It takes work to cut grass over a period of time. Work is power x time. And power is the integral of torque x rpm. So, for 1000 rpm vs. 540, you can still use the same amount of sunlight. (BTW: 1000 is not twice 540. So the extra 80 rpm from a speed doubler could cause catastrophic failure of your sense of humor).

Or depending on Brand /model just exchanging the PTO output shaft can accomplish this (540 to 1000). iirc our Case 970 was that way and so is my Rhino

If it is a 35 HP tractor your suggested methods sound as good as any.

 

[RickB]

That mower will run on a lot less than 26 gpm. But the snowblower is a game changer.

 

[RickB]

Or depending on Brand /model just exchanging the PTO output shaft can accomplish this (540 to 1000). iirc our Case 970 was that way and so is my Rhino

Already discussed. The OP’s tractor is 540 only.

 

[sd455dan]

Already discussed. The OP’s tractor is 540 only.

guess I missed where the OP stated what tractor brand/model he was referring to. his 1st post did say 540 pto though.

Why not run it on the TN75? or one of the other 1000 rpm PTO capable tractors listed in ironpen's sig line?

 

[4570Man]

I’ve seen big tractors that had 540 and 1000 rpm pto shafts. The 1000 rpm shafts are a finer spline. I’ve seen tractors that offered 540 and 1000 rpm from the same 540 standard shaft. I’m pretty sure the OPs tractor is a 540 only model.

 

[RickB]

guess I missed where the OP stated what tractor brand/model he was referring to. his 1st post did say 540 pto though.

Why not run it on the TN75? or one of the other 1000 rpm PTO capable tractors listed in ironpen's sig line?

TN 75 is 540 only, at least those configured for sale in North America.

 

[MESSMAKER]

Just get the right one and forget the work around. Just one more thing to tear up. Rotary mowers are not that expensive to start with.