Pto hp of a 135hp tractor

[FarmerJW]

What should the pto horsepower be of a 135hp tractor?

 

[trebornella]

Usually allow 10% for losses through transmission etc, so PTO HP ought to be 120 ish. Needs to be put on a dyno to confirm, some 135HP tractors can be above or below specs by some way.

 

[Hilly]

They all differ never get two the same no matter what.

 

[Wellytrack]

Somewhere between 110-200 should cover it. Could be dead as Caesar’s tabby cat or had its bean flicked.

 

[ridger]

Pto hp is a strange thing. I drove a 180.90 fiat for a while back 20 years ago, nothing to touch it for pto work , but no power on the road with 12 ton on trailer.

 

[Wellytrack]

Pto hp is a strange thing. I drove a 180.90 fiat for a while back 20 years ago, nothing to touch it for pto work , but no power on the road with 12 ton on trailer.

TW Fords were the same, engine has little low torque and needs revs to make it. Hence it’s good at 540/1000 but no good for holding a gear and watching the revs fall.

 

[ford 7810]

I went to local dino day your right big difference one valtra 174 or whatever was 100 hp more on the PTO than the other one there, it must’ve had a chip on it’s shoulder

They all differ never get two the same no matter what.

 

[bravheart]

What should the pto horsepower be of a 135hp tractor?

What model is it? Older tractors can lose 10-20% of rated engine power through gearboxes etc. Newer with common rails, chips and boosts who knows could even be more than rated through electronic trickery.

 

[FarmerJW]

What model is it? Older tractors can lose 10-20% of rated engine power through gearboxes etc. Newer with common rails, chips and boosts who knows could even be more than rated through electronic trickery.

Valtra N series, was 120hp on the dyno so sounds about right

 

[FarmerJW]

What model is it? Older tractors can lose 10-20% of rated engine power through gearboxes etc. Newer with common rails, chips and boosts who knows could even be more than rated through electronic trickery.

Valtra N series, was 120hp on the dyno so sounds about right

 

[Magnus Oyke]

What model is it? Older tractors can lose 10-20% of rated engine power through gearboxes etc. Newer with common rails, chips and boosts who knows could even be more than rated through electronic trickery.

The power is lost through parastic losses in the drive line, turning the gears, shafts and clutches, oil drag, bearing friction. common rail, chips, boosts won't have any effect on that whatsoever.

 

[mac102004]

US tractors are all sold by pto hp check the specs over there for the same tractor. We have a Masey 6280 which I think is around 135hp, they rated then at 110 PTO hp.

 

[Wellytrack]

The power is lost through parastic losses in the drive line, turning the gears, shafts and clutches, oil drag, bearing friction. common rail, chips, boosts won't have any effect on that whatsoever.

From my interpretation of the post you have quoted he never suggested anything else but point out modern tractors can kick out more than their nominally rated power when the conditions are met for boost - usually on a PTO function.

 

[bravheart]

The power is lost through parastic losses in the drive line, turning the gears, shafts and clutches, oil drag, bearing friction. common rail, chips, boosts won't have any effect on that whatsoever.

Yes it will.
We have tractors that can sense the twisting torque on the pto shaft so when conditions are right the electronics BOOST the power from the engine to give extra pto power but that extra cannot be used or abused while transporting heavy loads on the road because there's no twist on the pto shaft. Others will vary but on the Case there is a light on the dashboard to let you know conditions have been met for boosted power.
That's only possible because or electronic injection and common rail.
Agreed on your first sentence and it's what I meant by gearbox losses.
So a more modern tractor at 135 hp may be putting out 135 (or more) hp. when measured at the shaft when conditions are right.

 

[clbarclay]

Used to be that tractors peak power was at rated speed. They could still carry a lot at Joe much power they retained at lower revs.

Then they started trying to give them a constant power bands, so the power didn't start dropping off immediately under load or reduced revs. This tended to cause a slight leak in max power just below rated revs. That was still when most were still mechanical injection.

Electronic injection opened a world of possibilities and one of them was boost, allowing power to be increased for PTO and high forward speed work without having to strengthen the gearbox or final drivers to handle the extra power. This meant factory tractors could output significantly more power through the PTO than their rates power.


Then there are modified tractors and it's just a question of how far you want to push your tractor towards being a competition tractor puller. Potentially any times the power they were originally intended to be, but then not intended to do a day's work at that power level.

 

[Magnus Oyke]

Yes it will.
We have tractors that can sense the twisting torque on the pto shaft so when conditions are right the electronics BOOST the power from the engine to give extra pto power but that extra cannot be used or abused while transporting heavy loads on the road because there's no twist on the pto shaft. Others will vary but on the Case there is a light on the dashboard to let you know conditions have been met for boosted power.
That's only possible because or electronic injection and common rail.
Agreed on your first sentence and it's what I meant by gearbox losses.
So a more modern tractor at 135 hp may be putting out 135 (or more) hp. when measured at the shaft when conditions are right.

It may well boost, but a tractor with 135hp engine will have about 135hp -10% at the PTO. If it's boosting, the engine has been increased in power, so the egine is no longer 135hp, power doesn't increase betwix crank and PTO shaft.

 

[Wellytrack]

It may well boost, but a tractor with 135hp engine will have about 135hp -10% at the PTO. If it's boosting, the engine has been increased in power, so the egine is no longer 135hp, power doesn't increase betwix crank and PTO shaft.

You and I both know what he is saying - your just arguing to hear yourself.

 

[Magnus Oyke]

You and I both know what he is saying - your just arguing to hear yourself.

No, he asked what a 135hp tractor should make at the PTO, and it's roughly 135 - 10%, agreed? You then muddied the waters by saying, some tractors boost on PTO operations. This is true, but when they boost, they are no longer 135hp, in this instance. They are likely to boost to circa 150 engine horse power, which doesn't answer the OP's question, does it? The tractor that boosts will have a rated power rating, boosted power rating and PTO figures for both.

 

[Wesley]

Yes it will.
We have tractors that can sense the twisting torque on the pto shaft so when conditions are right the electronics BOOST the power from the engine to give extra pto power but that extra cannot be used or abused while transporting heavy loads on the road because there's no twist on the pto shaft. Others will vary but on the Case there is a light on the dashboard to let you know conditions have been met for boosted power.
That's only possible because or electronic injection and common rail.
Agreed on your first sentence and it's what I meant by gearbox losses.
So a more modern tractor at 135 hp may be putting out 135 (or more) hp. when measured at the shaft when conditions are right.

I thought generally one of the parameters for the boost to kick in was a minimum speed i.e. not stationary. So unless you were dragging the dyno around with you then you’re unlikely to test the boosted pto power without the help of a laptop to bypass things…maybe things have moved & this is no longer the case, but it used to be.

 

[clbarclay]

I recall that the boost on the tractors I have is either speed or pro dependant rather than reqiring both and isn't all or nothing either, but different manufacturers program them differently.