PTO speed really needed?

[MossRoad]

<font color="blue"> It also has a foot throttle </font>

So does mine.

<font color="blue"> Why would foot throttles exist if you were supposed to run it at PTO speed all of the time ? </font>

I was referring to running implements at PTO speed. You set the hand throttle to get the engine RPMs where the little line on the tachometer says 540 PTO. As for normal operating without an impliment, it still says to run it at a high RPM to provide proper lubrication and pressure. The foot throttle is for when you need a burst of power, like when you are crowding the bucket on the FEL in a dirt pile, or going up a hill.

<font color="blue"> I would suspect that all Hydro eauipped tractors say to run at PTO speed for the Hydro's benefit.
</font>

I have no way of confirming this, as I do not have access to anyone else's manuals. I have asked it before, but have not gotten an answer from anyone. /forums/images/graemlins/frown.gif

 

[MossRoad]

Bird,
Aren't you, Doc and I saying the same thing? /forums/images/graemlins/laugh.gif

 

[Bird]

</font><font color="blue" class="small">( I would suspect that all Hydro eauipped tractors say to run at PTO speed for the Hydro's benefit. )</font>

My Kubota manuals "recommended" lower RPM, such as 1800-2200 when using the FEL, so I don't think you necessarily need to run them at PTO speed when you're not using the PTO.

</font><font color="blue" class="small">( Aren't you, Doc and I saying the same thing? )</font>

If we ain't, it ain't for lack of tryin'. /forums/images/graemlins/wink.gif /forums/images/graemlins/laugh.gif

 

[Docsknotinn]

Bird, why run lower when useing the FEL ? does that produce less/more hydraulic pressure ?? Dave

 

[cowboydoc]

Dave,

He's talking about lower rpms when compared to running the pto. 1800-2200 isn't necessarily low overall.

 

[Sprocket1]

If anyone happens to have their post hole digger on right now, would you run outside and start your tractor, rev the engine up to the "PTO" speed on your tractor tach and tell me what happens to the auger at that speed? If you are really interested drop the auger in the ground, too. In my opinion "correct pto speed" is based on various conditions and applications.

 

[cowboydoc]

Personally I don't start the auger going until I have it in the ground. This is a safety issue. I hope nobody is running their auger with it out of the ground and trying to set it in the right place. Once in the ground you start it slowly and build it up to pto speed. Most of the ground I've been in you have to have full pto speed to get it to dig. If you slow down before you get it out of the ground it will many times bind up and kill the tractor if you are at below pto speed. Then you try and restart it and bust a bolt. It's always fun then to dig out the auger. /forums/images/graemlins/frown.gif

 

[fishman]

That's interesting Richard. I was under the impression the concensus around here was to run a phd at under 1500 rpm (motor speed). Not that we ever have a true concensus of course /forums/images/graemlins/laugh.gif

Based on that advice, I have been running mine at 1100 rpm. If I dared to go at full rpm I don't know what would happen. I know that I sure don't want to pull it out of the hole at 1500 rpm. Might just be my unit, but it bucks all over the place.

Now for the first 15 years of my life with tractors, I always ran our finish mower at 540 rpm and never had a problem. But it would seem to me that diesels, which make a lot of their power at low rpm's, would be ideal for running things at lower rpm's as long as you weren't lugging them down.

 

[pruntyc]

I don't think the foot throttle was meant to be used when using the PTO. If using a fel or blade or what have you, then you could use the foot throttle. The PTO is suppose to be run at 540 rpm. But a diesel engine will have good hp at a slower speed. So you can use it for fel or blade or etc. without it being at full speed, because you are not using the PTO. I wouldn't work a gas engine tractor at too low a speed as it doesn't come on to it power at a real slow speed like a diesel. Just my 2cents worth. /forums/images/graemlins/smile.gif

 

[cowboydoc]

fishman,

I certainly don't leave the digger going when I get out of the ground. You are right it flops around like a fish out of water. /forums/images/graemlins/grin.gif When I get to the top I turn it off. That way I don't fling my dirt from the hole all over the place and back in it. I'll also start out slowly and then build up to pto speed. Once I'm in the hole and augering though I've got it at full pto speed. Then as I back it out I start to ease up as the pressure eases up. Usually at about 2/3's of the way up I'll just turn it off and pull it out the rest of the way with the 3 point. I'm certainly no post hole digging expert and there are many other great ways of doing it I'm sure. That's just what works for me.