Using max pto HP?

IndyIan · Sep 28, 2015

I got into running a buddies 4x5 round baler this summer and needless to say, it gave my tractor a good workout. It was fun making 4x4's but much bigger I was running out of hp to actually move the tractor. The temp gauge really didn't move above normal but it sure was removing some heat.
Can a tractor make say 90-95% of rated power all day without a problem? I think the DK50 has the same cooling system so I figured I had a bit of a buffer.
It is too bad you can't see what the injector pump is actually doing although with the HST you can give the pedal a pump and either it will speed up or bog if the baler is using all the hp.
I just stayed in low range and 3.5 mph wasn't too bad as the fields are a bit rough.

jenkinsph · Sep 28, 2015

You can run at high loads all day but it is important to keep track of fluids and temperatures. Keep the radiator clean and check the air filter often if dusty or grass chaff is an issue.

Sawyer Rob · Sep 28, 2015

Problem is, your exhaust temp can go too high LONG before it shows up in your cooling system...

You should NOT pull more than 80% of the MAX, your PTO puts out, for extended periods of time...

I could "melt" my 5.9 Cummins right down, and never see the coolant over heat!!

SR

MHarryE · Sep 29, 2015

My Kubota M135GX displays %power as one possible selection. I typically run in the 90 - 100% range for hours at a time. I have the radiator, air-to-air after cooler, fuel cooler, hydraulic oil cooler, and air conditioner condenser to pull air through. If I don't keep them extremely clean I will get an ATAAC alarm after 10+ minutes running over 95% on a 80 degree or hotter day. I think the cooling system should have more margin but there is a lot of cooling load on a system and I'll drop a gear before I give up my air conditioner.our JD 7720 can never be loaded enough to budge the heat gauges. The larger tractors are built with more cushion. There is room for increased cooling capability.

PoorPlowboy · Sep 29, 2015

Sawyer Rob said:
Problem is, your exhaust temp can go too high LONG before it shows up in your cooling system...

You should NOT pull more than 80% of the MAX, your PTO puts out, for extended periods of time...

I could "melt" my 5.9 Cummins right down, and never see the coolant over heat!!

SR

A Cummins 5.9 in an automobile is not designed for 100% duty cycle like an industrial engine in a tractor. A Cummins 5.9 is turned up to around 55hp per liter displacement. A DK40SE is 20.5hp per liter. That difference in tuning is what allows full duty cycle operation.

brown40 · Sep 29, 2015

I believe they are designed to be able to run the PTO full on all day, provided air flow/heat transfer stays good--otherwise they'd have duty cycles or warnings in the manual about running them "greater than 'x' hours" before letting them cool. That does sound like a bigger job for your machine than it may have been designed for though. I think sizing implements to not take every scrap is part of the equation. A generator application would be a tall order on a duty cycle.

ddbackhoe · Sep 29, 2015

IndyIan said:
I got into running a buddies 4x5 round baler this summer and needless to say, it gave my tractor a good workout. It was fun making 4x4's but much bigger I was running out of hp to actually move the tractor. The temp gauge really didn't move above normal but it sure was removing some heat.
Can a tractor make say 90-95% of rated power all day without a problem? I think the DK50 has the same cooling system so I figured I had a bit of a buffer.
It is too bad you can't see what the injector pump is actually doing although with the HST you can give the pedal a pump and either it will speed up or bog if the baler is using all the hp.
I just stayed in low range and 3.5 mph wasn't too bad as the fields are a bit rough.

The baler probably requires more hp than you have to offer. Most balers in that size range require 40 pto hp to operate efficiently, so with only 32 pto hp available.........To answer the question though, running it for 8 hours at 2600 rpm should not be a problem.

moriboy · Sep 29, 2015

Agree with others, equipment is designed to run at 100% duty cycle for extended periods.

CobyRupert · Sep 29, 2015

HP is not a measure of force, torque or energy, it's a measure of the RATE of force or energy. The HP requirement of the baler is a function of the RATE of hay being fed into it, which is a function of windrow density and ground speed. (i.e. 1/2 the horsepower can do the same work in twice the time)
Sounds like the Kioti is actually be sort of self regulating if ground speed slows down when baler torque demand goes up.

Sawyer Rob · Sep 29, 2015

PoorPlowboy said:
A Cummins 5.9 in an automobile is not designed for 100% duty cycle like an industrial engine in a tractor. A Cummins 5.9 is turned up to around 55hp per liter displacement. A DK40SE is 20.5hp per liter. That difference in tuning is what allows full duty cycle operation.

A 5.9 is an auto engine?? Then why is it in thousands of tractors, dozers and all kinds of other equipment that require extreme service?? Are you trying to say your Kioti is more HD than a 5.9??

Did you know that some 5.9's are only rated at a little over 100hp???

No matter, that was just an example... lol

The 80% rule was clearly printed in the manual of some of the new tractors I've bought, including two AGCO farm tractors. (NOT Cummins powered)

One of the Kubota's I use to own, I ran near MAX for several hours and although the coolant never over heated, it burnt the valve guides...

Run them to max boys, it's your money and they make more!

SR