Hydrostatic vs. Manual pro's and con's

[JerryG]

Re: Hydrostatic vs. Manual pro\'s and con\'s

<font color="blue"> if a relief is lifting before it breaks traction...something is wrong </font>
Not really. If there is enough traction to cause the relief to blow, that is what it is suppose to do. That amount of traction can be caused in several different ways. The tractor can be over loaded, it can be chained in a way to pull the tractor to the ground as the chain is pulled. Another way and the way that was shown in the thread that I was referring to was to have the tractor in a area that was very steep to where the rear wheels were so loaded with the weight of the tractor that it would blow the relief. The relief is there for a reason. It is to protect the system. The way some talk here, is that if the relief blows, something is wrong. It is just doing its job.

 

[Cactus]

Re: Hydrostatic vs. Manual pro\'s and con\'s

</font><font color="blue" class="small">( <font color="blue"> I don't know if you have read about the member that was here a couple of years ago with HST problems or not. He had his tractor in a hollow and the relief would blow and he couldn't get out. Maybe someone remembers what the name of the thread was, I don't. Seems like the had to get a dozer to pull him out. </font> )</font>

I remember that thread....the problem was the tractor was on an incline and it was showing hydro oil in the sight glass but in reality it was very low on hydro oil,it took him about a week to figure out was going on. I believe it was a Kubota tractor and once the guy got it figured out I think he kind of went away... /forums/images/graemlins/crazy.gif

 

[JerryG]

Re: Hydrostatic vs. Manual pro\'s and con\'s

Do you know where the thread is? I don't think that was what happened, because I seem to remember that he put more oil in it and it still wouldn't climb out.

 

[KiotiJohn]

Re: Hydrostatic vs. Manual pro\'s and con\'s

</font><font color="blue" class="small">( If there is enough traction to cause the relief to blow, that is what it is suppose to do. That amount of traction can be caused in several different ways. The tractor can be over loaded, it can be chained in a way to pull the tractor to the ground as the chain is pulled. )</font>
I agree with Jerry. There are times when the tractor can get into just the right position so as to restrict tire movement to a point that the pressure relief will trigger. Sometimes, in heavy mud with the front tires turned and the rear tires being restricted by the heavy mud, it can go into relief. Of course, all of this is dependent, as I said, on how large a tractor, what the pressure relief setting is, etc.
I've pulled trees at time that have done exactly as Jerry stated, putting so much down pressure on the tires so as to keep them from spinning until the pressure was hit, and relief initiated.
This is usually not that big a problem as simply making some changes in the hook up usually will take care of it, but a geared tractor would have kept trying until the tires slipped, or the engine lugged down, or stalled out. I might just be able to get the job done with that little bit of extra pulling before the tires completely slip.
John

 

[jeffinsgf]

Re: Hydrostatic vs. Manual pro\'s and con\'s

RE: Shuttle shift's advantages and disadvantages.

I have the JD version of shuttle shift, which is called, in JD-talk - ePowerReverser. I am quite fond of it, and personally think it works better <font color="red">for me </font> than an HST would.

That said, I have to relate one of the disadvantages of shuttle shift. After spending most of the day on my 4410 one day last week, I nearly backed into a car in the supermarket parking lot. The turn signal indicator on my pickup WILL NOT make it change direction. /forums/images/graemlins/shocked.gif

 

[JerryG]

Re: Hydrostatic vs. Manual pro\'s and con\'s

You really have to watch those dang levers, not doing what they are suppose to do. /forums/images/graemlins/grin.gif

 

[KiotiJohn]

Re: Hydrostatic vs. Manual pro\'s and con\'s

</font><font color="blue" class="small">( That said, I have to relate one of the disadvantages of shuttle shift. After spending most of the day on my 4410 one day last week, I nearly backed into a car in the supermarket parking lot. The turn signal indicator on my pickup WILL NOT make it change direction.)</font>
/forums/images/graemlins/grin.gif /forums/images/graemlins/grin.gif /forums/images/graemlins/grin.gif /forums/images/graemlins/grin.gif

Seriously, there may be another disadvantage to shuttle shift, if one has to clutch to shift. Some people complain that a day of doing that takes its toll on the knee or ankle. My brother loves my HST because his old Massey's clutch makes his knee swell after a few hours. Clutchless shuttles don't present that problem.
John

 

[jeffinsgf]

Re: Hydrostatic vs. Manual pro\'s and con\'s

</font><font color="blue" class="small">( You really have to watch those dang levers, not doing what they are suppose to do. /forums/images/graemlins/grin.gif )</font>

Luckily, I remembered that I was in a road vehicle before I smacked the BMW that was behind me. /forums/images/graemlins/blush.gif

Hey, neighbor, just noticed your location. Where in NW AR?

 

[JerryG]

Re: Hydrostatic vs. Manual pro\'s and con\'s

Huntsville. I like your Race Brothers store. We have one, but they don't carry near as much as yours. There is a farm store west of Race Brothers. They had some really good prices. What is their name?

 

[timb]

Re: Hydrostatic vs. Manual pro\'s and con\'s

</font><font color="blue" class="small">( If there is enough traction to cause the relief to blow, that is what it is suppose to do...It is just doing its job.)</font>

There may be, if not an exception, at least an unexpected result of that. I believe someone did some checking a while back specifically on the New Holland class III boomers and determined that the hydro relief setting was the same across all of the TC35-40-45 models. That meant that while the TC45D still had more PTO hp than the TC40D or TC35D models, it can't put any more power *to the ground* than the TC35D. Now in some cases the relief valve may well need to be set where it is to protect the rest of the chassis (axles, final drives) despite the extra engine power of a bigger model. But in the case of the NH units - NH has no problem letting the gear versions of the same tractors put full power to the ground, so in effect the TC45D hydro is getting a little shortchanged. It is a subtle impact but one that a hydro buyer should take into account.

(Not picking on NH, that may be true in other manufacturer's lines of similar sized (but different hp) models as well, but the NH units were the topic of discussion at that time.)