Two speed PTO

[ptsg]

Here is a picture from the service manual for the F/15 series about the PTO Gears. It shouldn't be too hard to figure out the right RPM for the 540E with a simple math, although, the dashboard does have a mark for both 540 and 540E speeds.

Anyways, the 540E is around 1800/1900 engine RPM, right at the engine torque peak.

 

[Cougsfan]

I use the PTO for spraying, post hole digging, fertilizer spreading (broadcast), and mowing. I have no idea at what engine rpm produces the 540 or 780, but I'd also guess it is about 2000 rpm on my tractor. I do agree that it is all linear. As everything but mowing is very low hp usage, I always use the 780 rpm setting running the tractor at low rpms. Sometimes I have to rev the tractor up a little more when mowing heavy brush. If I remember, I turn it down to 540, but usually I forget.
With the Branson and it's soot burner, a lot of people have difficulty running at low rpm, so the 520 setting may be a bit more important. I have never had a problem letting my 4720 chug around at low rpms though.

 

[kthompson]

All you need is the engine RPM for 540 rpm in the 540 PTO gear, and the target PTO rpm of the other PTO gear, as I showed in my last post. Since everything is using gears (even on an HST tractor) the relationships are all linear.

eric, not saying you are wrong, just never heard of the formula you are using. Reading this post think I can understand it but want to ask it a different way to be sure.
So if you had the engine rpms for a 1,000 rpm pto and only wanted 540 pto rpms you would use 54 percent of the engine rpms? That makes sense to me.

That makes sense if the gearing is not affected as it is in my JD when you switch to 540E. It does changing the gearing to the PTO. The engine rpms are also capped at the engine speed to get that 540 pto speed. So if the gear changes as it does with my JD then the company needs to show the engine rpms or you need a way to check the pto rpms, I think.

This does go to point out again some of the potential issues with gray market tractors.

 

[5030]

My M9000 Kubota has a 2 speed (540 / 1000) PTO. It's a 540 6 spline and a 1000 21 spline. The tach is marked for the 540 pto speed but not the 1000. However, 1000 RPM is also attained the 540 mark on the tach. I use the 1000 21 spline with a 6 spline adapter for running less power intensive implements like a hay rake or grain leg because it consumes less fuel and less wear and tear on the engine. I used the formula in post 11 to ascertain the correct pto speed plus I used a mechanical contact type tach on the shaft end to determine the exact rpm and I marked the tach face to show that rpm.

Mine is a 2 pto shaft setup. I change out the shafts (either a 540 6 spline or the 1000 21 spline shaft) depending in what I need to run.

 

[LouNY]

My Branson 8050 with it's 2 speed pto;
in speed 1 is 540 pto rpm with 2500 engine rpm
in speed 2 is 760 pto rpm with 2500 engine rpm.

so to get 540 pto rpm in speed 2,
2500/760= 3.289 (engine revolutions per pto rev.) x 540= 1776 engine rpm for 540 pto rpm in speed 2

The Branson being a mechanical injection with no computer control has no automatic or governor limiter on the pto speed so it could run a 540 implement at a higher speed then designed for, it could turn it at 760 rpm easily.

The IH Puma at the farm is an electronic common rail on it when the economy mode is selected it will electronically limit the governed speed to prevent overspeeding a 540 rpm implement. A similar limiter is found in the transmission control, it is limited to 25 mph but 19th gear has the mechanical capability of going faster so the computer limits the engine rpm so the operator can not exceed 25 mph.

All economy pto's are a gear shift in the pto module of the tractor some tractors will be limited to prevent overspeeding an implement, others will require the operator to maintain an engine rpm limit that will not over speed their equipment.

 

[ptsg]

Right on Lou. Although it's interesting to see that a much bigger tractor, uses the same exact engine RPMs for the PTO as my tractor.

I use the 540E all the time. Mowing and tilling ground that has never been touched in 20+ years. Never had the need for the regular 540, but sometimes I use it mostly as a break in procedure for 10 or 15 minutes.

 

[ericm979]

eric, not saying you are wrong, just never heard of the formula you are using. Reading this post think I can understand it but want to ask it a different way to be sure.
So if you had the engine rpms for a 1,000 rpm pto and only wanted 540 pto rpms you would use 54 percent of the engine rpms? That makes sense to me.

Yep. That's what I mean by the relationships are all linear.

That makes sense if the gearing is not affected as it is in my JD when you switch to 540E. It does changing the gearing to the PTO. The engine rpms are also capped at the engine speed to get that 540 pto speed. So if the gear changes as it does with my JD then the company needs to show the engine rpms or you need a way to check the pto rpms, I think.

The tractors I've had have not had any feature to limit engine RPMS depending on the PTO gear selected. That'd be useful but would require EFI to avoid a complicated linkage.

Branson should have put a mark on the tach corresponding to 540 rpm in the 760 PTO gear. It wouldn't have cost any more.

 

[ptsg]

Interesting. I do have a mark for the 540E on my tractor.

 

[Malvern Michael]

I don’t have the second pto mark on my rev counter and without knowing what rpm to set the engine at I can’t use the second pto setting
Michael

 

[Industrial Toys]

Lack of PTO speed options has always been an irritation on gear drive tractors. You might only have two reverse speeds and have to have rated engine RPM.