Hmmm, so from your statement, if we use the rule of (torque x rpm)/5252 = hp..Why won't we come to the conclusion that the baler is requiring more hp than the tractor can provide thus slowing the forward movement of the tractor?
Using max pto HP?
- Thread starter IndyIan
- Start date
- Views: 6198
Hmmm, so from your statement, if we use the rule of (torque x rpm)/5252 = hp..Why won't we come to the conclusion that the baler is requiring more hp than the tractor can provide thus slowing the forward movement of the tractor?
More precisely it is a measure of power where one HP is equal to 0.74569987 kilowatts or 745.7 Watts. The physical definition is one metric horsepower is needed to lift 75 kilograms (avg. body weight of a person) by 1 meter (3.28 feet) in 1 second. James Watt is credited with developing these definitions. Back to you CobyRupert....
CobyRupert
Super Member
Yes, we can come to that conclusion . ....and when it forward speed slows, baler requires less horsepower. Viola! Sounds like it's sort of self regulating (if forward speed is slowing faster than pto power is dipping).
More precisely it is a measure of power where one HP is equal to 0.74569987 kilowatts or 745.7 Watts. The physical definition is one metric horsepower is needed to lift 75 kilograms (avg. body weight of a person) by 1 meter (3.28 feet) in 1 second. James Watt is credited with developing these definitions. Back to you CobyRupert....
James What? He plays second base. Who?-"First base!"
My point being: horsepower is a measure of Power. Power is the rate of doing work. It is equivalent to an amount of energy consumed (or delivered) per unit time.
Think of it as this: a certain "task" (say driving your truck to the top of a hill) takes a certain amount of "Energy" or "Work". Regardless of how long it takes. Doesn't matter if you have a 500 hp motor and can drive in top gear and climb the hill in 10 seconds, you need to produce the same "energy" and perform the same "work" as if you had a 5 hp go-cart engine in your truck and used super low-range to climb the hill in 16-2/3 minutes. Both engines did the same work, and delivered the same energy. But "Power" is the ability for the 500 hp to deliver that energy in 10 seconds. i.e. how fast do you want to accomplish that work?
gladehound
Veteran Member
For clarity - what is the hp rating on this cummins 5.9 that you could melt down? My stock 7.3 (235hp) would not get over 1000F inside the exhaust manifold under sustained WOT. And that was at 32 hp per liter. The kioti is only 20 hp per liter!
andy1981
Silver Member
- Joined
- May 23, 2012
- Messages
- 175
- Location
- Western ny
- Tractor
- two John Deere 4720, John Deere 350b dozer, bobcat 435 excavator, 87 f600 dump truck
A 5.9 in a dodge is rated for a lower duty cycle than it would be in dozer or tractor that's why a tractor or dozer has lower hp than the truck . You will see higher hp in marine engine from a 5.9 because they use water cooled turbos and and have bigger cooling sysytems
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
Well that's the kind of experience I want to avoid. I can't find anything in owners or service manual about duty cycle but probably 80% is a good target with the odd 100% situation. I'll try to stick to mowing and raking next year although it was fun making bales.
Umm, no. The attachment is requiring more power(torque, hp, work effort, force, rate, etc.), hence the tractor becoming slower.
Depends on which numbers you are using. if 100% is 3000 rpms, then 80% is 2400 rpm (pto speed). There should be something in your owners manual about operating pto powered equipment at x rpm (pto speed).
Borrowed from a JD 5205 manual:
Operating Tractor PTO
NOTE: Engine will not start if PTO clutch lever is engaged.
1. Depress clutch pedal, start engine and push hand throttle lever (A) forward until engine speed is sufficient to start PTO implement. Engine speed must be less than 2200 rpm.
2. Move control lever (A) forward to engage PTO. PTO indicator (B) will light when PTO is engaged.
IMPORTANT: A warning alarm will sound for a few seconds if you leave seat with PTO engaged.
3. Increase engine speed to rated PTO speed of 2200 rpm for 540 operation (C).
CAUTION: Turn key OFF to stop engine, set brakes and make sure all mechanisms have stopped before cleaning out machine or making any adjustments to PTO driven implement.
4. Pull control lever back to disengage PTO.
A-PTO Control Lever
B-PTO Indicator
C-PTO (540) Rated Speed
There are gensets that never stop running, usually set up in tandem or higher, that are only halted to change the oil and do PM in remote areas and jobsites. They are usually diesels, and usually could put out far greater hp & torque than they are configured for. The application the motor is put to, and the amount of fuel they are combusting makes a tremendous difference in durability/heat damage. An engine burning fuel to hit 150 hp is not going to generate near the heat of the same one tuned to make 450hp. Automakers hate tuners, because they change the specs from what the design team had in mind for the application. Tractor design teams have a goal in mind when they select and set up their powertrain, and that's to run all day within their rated specs, regardless of the application. Get beyond their intention, and...
Jerry/MT
Elite Member
- Joined
- Feb 2, 2008
- Messages
- 3,138
- Location
- North Idaho-The Palouse
- Tractor
- New Holland TD95D, Ford 4610 & Kubota M4500
How do you know you were running at max power? Remember that max rpm is not necessarily "max power output".