Farm pro 2425 PTO speed?

legbreaker · Mar 8, 2005

I recently purchased a pto wood chipper and it states to run at 540 pto speed only. Does anyone know what the true 540 is ? Idle, half throttle, or full throtte? My lever is in 540.It seems that it doesnt perform well at idle speed (chips just barely shoot out). Half throttle peforms well but full throttle really works awesome. I just dont want to run it past idle if its going to ruin something.

Bird · Mar 8, 2005

I'm not familiar with the Farm Pro, but I'd be willing to bet its PTO speed is about the same as all the other tractors with which I've had experience, and that would be that PTO speed (540 rpm) is just a couple of hundred engine rpm below full throttle. On tractors without a tachometer, you can simply go to full throttle, then just back off barely enough to hear a slight change in the engine sound.

greg_g · Mar 8, 2005

( I Does anyone know what the true 540 is ? )

Your Y385 engine develops it's rated 25hp at 2350rpm. If I recall, revs for 540 PTO rpms is ~2200. Depending upon which instrument configuration you have, PTO speed may be indicated by a green area on the tachometer

//greg//

Soundguy · Mar 8, 2005

Remember.. even on HST models.. pto speed is ratio locked with engine speed. There are a few epto systems in use that change this ratio for fuel savings and load management.. but generally.. your tach will indicate your 540 pto rpm.

A very few machines have hyd pto.. and those may be independent of actual engine speed, depending on volume and flow regulation ( if any ) that is used.

Assuming 2200 rpm on your machine produced 540 pto rpm.. and you say you were running at idle ? 1000 rpm? that would mean that your pto was turing at a brisk 245 rpm or so.... no wonder it performed pitifully... thats 'roughly' a 4:1 ratio eng

to.. etc. again.. these are assumed numbers.. and used for illustration only.. etc...

Soundguy

johnk · Mar 8, 2005

What if you set the PTO @ 1000 and worked at half throttle as long as the motor doesn't lug?? .I use 540 PTO speed and about 900 motor rpm's when I use my PHD and it works great. I guess brush hoggin and mowing would be a different story..

SPIKER · Mar 8, 2005

John: tha PHD and the WOOD chipper are very different critters, the wood chipper requires the higher speed to keep the chut clear of chips, I run my tiller at lower RPM and low range to keep from breaking stuff should I hit a big rock, my mower I run up near full on PTO speed of 2K rpm on engine this keeps the blade speed up and clears clippings just like the wood chipper requires. the brush hog SHOULD be run at a low speed as long as it cuts the material well then it is going OK, if you have to up the speed to cut higher stuff then upping it you do. as long as it is not struggleing or lugging then run it as slow as you want just ermember that diesel engens run best at their rated RPM so running it slower may cabon up the exhaust and run the engine cool in heat which translates to less fuel efficiency per hr of use per HP of output.

<MarkM > /forums/images/graemlins/smile.gif

greg_g · Mar 8, 2005

( What if you set the PTO @ 1000 and worked at half throttle as long as the motor doesn't lug?? .I use 540 PTO speed and about 900 motor rpm's when I use my PHD and it works great. I guess brush hoggin and mowing would be a different story.. )

It's a matter of torque John. 900 engine RPMs is barely above idle; fine perhaps for PHD in light soil. Not much good for anything requiring even a modicum of torque though.

Your 224 engine only starts developing working torque from about 1100 RPM, eventually developing peak torque at 1700.

//greg//

johnk · Mar 8, 2005

It's a 2 cylinder and I think has more torque than a 3 cylinder at lower RPM's. Longer stoke more torque.......

greg_g · Mar 8, 2005

( It's a 2 cylinder and I think has more torque than a 3 cylinder at lower RPM's. Longer stoke more torque....... )

Yes John, a two cylinder generally develops more peak torque than a three cylinder of the same displacement. But that doesn't mean their torque curves differ significantly

//greg//

johnk · Mar 8, 2005

I think the longer stroke builds more torque through the entire spectrum of RPM's. The only downfall is more wear and tear on engine components because 2 cylinders are putting out the HP instead of three cylinders. Like they say.... You can't beat cubic inches but stroke makes more torque.

dancce · Mar 8, 2005

Set the engine RPM's at about 1900-2000 and "let her rip". Don't baby it. Diesel engines are made to work and run for extended periods of time in the "working "RPM ranges.
The worst thing you can do, is lug it at low RPM's.

dancce

greg_g · Mar 8, 2005

( I think the longer stroke builds more torque through the entire spectrum of RPM's. )

Have you actually looked in your engine manual John? I've only got performance curves for three and four cylinders. Your book should have the two cylinder torque curve included on the engine performance chart. Torque is expressed as Newton-Meters or ME (N+M) from ~1100 to 2500 RPMs or so.

//greg//

Soundguy · Mar 9, 2005

( The only downfall is more wear and tear on engine components because 2 cylinders are putting out the HP instead of three cylinders )

Or you could look at it like a 3 cyl has more components to wear out too...

Soundguy

johnk · Mar 9, 2005

I never looked at it that way. Also more friction and lost power but I guess everything has it's drawbacks. I was doing some loader work along side a 21 HP of another brand w/ a 3 cylinder and the guy took mine for a run and couldn't believe the difference. His would bog w/ a bucket load @ 1200 rpm's and mine wouldn't hesitate @ 800 Rpm's lifting a comparable load. He was impressed. Not to start a tractor war I won't mention his brand but my jinma has a rougher fit and finish, costs much less, had a few issues, and works like a bull on Steroids...

Soundguy · Mar 10, 2005

Torque is a big deal. I have a jd-b.. 2 cyl.. It is similar hp to a ford 4 cyl I have. Lugging ability is entirely different.

I can also run the 2 cyl to nearly a stall, and clutch or gass it and have it come back to life. The 4 cyl pretty much dies and won't come back if under 100 rpm.. etc.

Course there is a big rpm difference here too. The JD is only rated for half the rpm the ford is.. etc. Maybee less than half.

Soundguy

thegreatrandini · Mar 10, 2005

2 cyl out perform at low rpms but the 3 or 4 cyl out perform at higher rpms......based on torque chart I read somewhere....

legbreaker · Mar 12, 2005

thanks for all of your help. im running it now at 2200 rpm or close to the green mark on my tach. this chipper now kicks some serious a** . as always this site has answered one of my many questions. thanks- proud owner of a 2425.