Where does the HP come from?

[720lyle]

Looking to buy tractor in the JD 5000 series. The 5425, 5525 and 5625 all use the same engine with the same displacement and RPM"s. Are they just turning the pump up to get another 20 HP out of the 5625? If so. why could I not just turn up down the line if more HP is needed?

 

[Anonymous-0]

You probably could if the transmission and final drive could stand the extra torque. If not you break them. And you might to add significant ballast to make use of the extra torque at the wheels.

Gerald J.

 

[Gene Dotson]

More horsepower from the same displacement usually requires torbocharging and intercooling. More fuel, more and cooler air.
Turbocharged engines normally use extra cooling of the botton of the pistons and cylinder walls by spraying oil in this area.
Turning up the pump will likely give more horsepower at the risk of excessive exhaust temperatures and voiding the warranty if still covered... Gene

 

[Mark]

well.....I have a 5320 and from the dealer it dyno'd 62 PTO horses.....Deere advertises 55.

Deere went to a different engine in the 25 series....no wet sleeves for one...but I also think it's maybe a 5 cylinder? Anyway..it's different than the 3 and 4 cylinders the 20 series used.

That being said....ALL these new engines have added oil cooling, most are turbo'd and so forth......lubrication and cooling is pretty much a non issue on modern tractors.....UNLESS you push things to the limit. The first thing you will have problems with is exhaust temperature when you go to cranking up the fuel. All the fuel gets burned and it has got to be exhausted.....you can make the exhaust turn cherry red...and that's not good.

I had a very good Deere engine man tell me the 279 cube engine in my 5320 would go way past 100 horsepower....how long it would stay together is another thing. He also told me that Deere has these engines so dialed down nowadays that dialing in 20 extra horsepower was nothing and certainly do-able with zero problems. I was also told that before the engine ever reached being over stressed.....the clutch and drive train generally fails to handle the extra horses.

Okay....the whole point is this: It is extremely doubtful that there is any difference at all between any of the tractors you mentioned...except how they were dialed in at the factory. The largest unit may have intercooling in the turbo and the smaller tractors might not.....I don't know and if you don't know....ask the dealer. There is no need in asking the dealer to turn up the fuel......he wants your money and there being on average $4000 additional every time you go up in size.....that egg sucker isn't going to do you any favors.

 

[buickanddeere]

Go through the parts book on the JD site. Look for any differences in the drive train, cooling, engine internals. If every single part is identical except for the decals on the hood. Then tweak away.
The 5105 and 5205 are identical except for the decals and injection pump settings.

 

[jd b puller]

Methinks it's computer controlled. At least on the bigger ones it is. Not certain about the 5x00 tractors.

 

[Texasmark]

Well, I have a '74 4230 with the 404 cu in engine rated 100 pto hp at 2100 rpm's.

The same engine in a 4430 is rated at 125 pto hp at 2100 rpm's but it has a turbo and higher compression heads as a result.

Pluuuuuuuuuuuuuuuuuuuus, if you look at the inline pump on it (vs my distributor Roosa Master) it is almost twice the size. That translates to me as a lotta more diesel to run that sucker.

So the makins of the 5xxx may be similar.

Mark