pto gearbox speed increaser

[ns_in_tex]

I think I would like to be able to mow with much lower rpm's on my tractor engine. Does anyone know of a pto gearbox speed increaser? It would be nice & much quieter to be able to run the engine at say, 1600 rpm while mowing, & still get 540 output.

 

[kayssupply]

The easiest way would be to get a Yanmar tractor. They have a 4 speed PTO 560/730/940/1200. I use the 730 at 1800 all the time in low grass.

 

[chim]

On my B7500, the PTO goes 540 RPM with the engine at 1500 RPM and the PTO selector in the 1000 RPM position. I brought a mechanical tach home one time and checked it. Figured it could come in handy sometime. I use the RFM to rake leaves in the Fall..................chim

 

[jhburke]

Chim
My B7500 has a mark on the tach for 540 pto. It is closer to full throttle than not. Does yours have the same mark?

 

[chim]

Sure does. The 540 (PTO RPM) mark is at about 2600 engine RPM's.

Sorry if I misled you earlier. The selector is either 540 or 960, not 540 or 1000 as I typed it. I did check and got 540 PTO RPM's by operating the engine at 2600 RPM's, and also by placing the selector lever in the 960 position and doing 1500 with the engine.

Using the tractor at 1500 engine RPM's seems like it borders on "lugging" it unless you're doing really light work..........chim

 

[justractors]

Most of the small diesel engines are designed to work best at the higher rpm. If you were to get a torque curve chart you would find that they produce the most torqe and horsepower at or near their maximum governed rpm.
The will will lug down, using more fuel and creating more engine wear, if a heavy load is placed on them at a lower rpm.
The reason they have the different pto rpm positions is due to some pto driven implements require higher pto revolution input.

Of course this is just my humble but well thought out opinion.

Bill

 

[ns_in_tex]

I continue to learn more every day off tbn. I did not know they made a tractor with 4 speed pto. I sure wish someone would let us make a wish list, by taking the features off each tractor we had used & build one tractor with all the features.
I guess this might make the perfect tractor.

I don't think another tractor is in the cards for me.
Thanks,

 

[ns_in_tex]

Chim,
I do likewise on my 105 hp hesston with a 20' bushhog. When mowing weeds in the pasture I put it into 1000 rpm pto & run the engine about 1500 rpm, then when mowing heavy stuff, I put it in 540 rpm & run the engine faster.

I don't think my L4610 has but 540 PTO.
Sure wish it did.

 

[ns_in_tex]

Something I don't understand is on the torque chart for my L4610, it shows to reach maximum torque at about 1500 rpm, then slowly fall as engine rpm's rise. At the same time the brake hp continues to rise as the rpm's rise.
How can you have maximum torque at nearly 1/2 the rpm's, but maximum hp at top rpm's?

 

[cmsedore]

Horsepower (roughly speaking here), is speed * torque. So, as speed rises, torque falls off (but not proportionally, or the HP would stay constant). Perhaps someone more knowledgeable on the physics of IC engines will enlight me (us) as to why this is the case.

-Chris