Hydrostatic--What's the scoop?

[Hoosier_Daddy]

Hydrostatic--What\'s the scoop?

Ok, here is a general discussion issue that I started thinking about after a conversation with a friend who has the same sub-compact I have, a BX2200.. But it should apply to all tractor's with HST. I now have a ? floating above me.

We were having a brew at the local Legion and started talking about our tractors do's and dont's. He has a very large pond (small lake) and it is rather steep on one end. Of course he has to mow up, move over, mow up, etc.....

I said I was kind of disapointed when I first brought my BX home and used it on my hill and it wouldn't pull itself up the hill in the high gear range. It didn't stall, it just wouldn't pull itself along. Just stopped moving... I had to switch to the low range. Not a problem, I was just a little disapointed ..

He says "You should always pull a hill in low range or you will burn up the transmission". I am thinking other than two gears to change the speeds, what's to burn up? It's fluids and plates.....

In a car transmission if it won't pull a hill the engine bogs down.. Bota didn't. Just quit moving. So, I guess there is some kind of clutching going on that is slipping.

Can you all educate this Hoosier on what is going on inside this orange machine? Tom

 

[GlueGuy]

Re: Hydrostatic--What\'s the scoop?

There are a couple of discussions elsewhere about how an HST works. I think the best one was one that Harv started about 4 or 6 months ago. For most compact tractors, the HST is a variable-displacement hydraulic pump that drives a fixed-displacement hydraulic motor. The output of the pump is tied to the position of the foot pedal; more pedal, more volume.

As for stalling on the uphill, nothing will be damaged for short periods of this, as excess pressure gets diverted through a bypass. However, the longer you sit, the hotter things will get (hydraulic fluid). Eventually, I imagine the fluid would get hot enough to break down, but it would probably take a while.

 

[Harv]

Re: Hydrostatic--What\'s the scoop?

<font color=blue>one that Harv started</font color=blue>

Guess you're referring to the ol' <A target="_blank" HREF=http://www.tractorbynet.com/cgi-bin/compact/showthreaded.pl?Cat=&Board=genoperating&Number=99598&page=&view=&sb=&o=&vc=1#Post99598>HST - How Does It Work?</A> thread, GlueGuy. I learned a lot from that one.

 

[GlueGuy]

Re: Hydrostatic--What\'s the scoop?

That's the one Harv. Thanks! I'm too lazy or too busy these days to search for it. Thanks for digging up the link. I have only been able to check TBN about once or twice a week these days; I am a bit overwhelmed with the volume.../w3tcompact/icons/tongue.gif

 

[Jeff396]

Re: Hydrostatic--What\'s the scoop?

Yeah, I have unfortunately resorted to just skimming hitting on only what I consider the interesting topics./w3tcompact/icons/frown.gif

Jeff

"Bigomy is having one wife too many.....Monogamy is the same"

 

[Hoosier_Daddy]

Re: Hydrostatic--What\'s the scoop?

Thanks to Harv and all for the thread links. I read them and re-read them. Very Interesting!

I guess it's like Jet Engines. They suck air in and mix it up with a 1000 parts and blow it out the other end with a lot of force.

It's nice to know some details to understand the concept but other than that just accept the fact that they work and work very well at that.

And, I will continue to operate as I do. Use common sense when operating. If you need more torque to the wheels drop to the lower gear because at higher speeds (gear) you have less torque to the wheels.

Or as Bird put it in the other Thread. In keeping the concept simple, "push the peddle forward to go forward and push backward to go back......." I can really understand that!

Thanks to all, Tom

 

[fmorgan]

Re: Hydrostatic--What\'s the scoop?

Tom--

I'm sure those threads mention the fundamental point that pushing the pedal harder means less torque, which relates to the going-up-hill part of your question; when the hydro bogs down going up a hill, ease off on the pedal instead of pushing harder like in a car.

 

[Hoosier_Daddy]

Re: Hydrostatic--What\'s the scoop?

Rick, Pond get full yesterday and today?

 

[rmorgan]

Re: Hydrostatic--What\'s the scoop?

Oh, man, Hoosier, you got it--3/4" yesterday, 2.5" today, and they're saying an inch tomorrow--the overflow pipe is getting a workout and the creek sounds like Niagara. May need some help from the Construction Brigade if things don't dry out--still got friends? Can't believe the east coast is in serious drought. The best thing tonight, pond-wise, was about 2,000?? 3/8-1/2" small fry, too small to tell whether bass or blues, all schooled together. What an amazing thing to have in the front yard!