travel pump

[Gravy]

If it works, I'll have to copy it and bow repeatedly in the direction of East Tennessee, chanting "All Hail the Mighty Stray!!!"

But don't feel like there's any pressure here...! : /forums/images/graemlins/wink.gif

 

[KentT]

Stray,

If it were my $$$, I'd spend the least amount possible to test the hypothesis in this experiment. Then, if it worked, I'd figure out how to improve it with solenoids, etc.

I'm trying to mentally picture all the plumbing necessary to have a system "switchable" to work both ways, and am having severe brain cramps.... /forums/images/graemlins/tongue.gif /forums/images/graemlins/tongue.gif

 

[BobRip]

Just a suggestion. It would be nice to reduce the power to a slipping wheel. Leaving it plumbed the way it is now, but put a valve and lines around each wheel motor (I know a lot of lines). The valves would normally be closed and then opened a little or a lot around a slipping wheel. This way all or most of the pressure and flow goes to the non slipping wheel. It seems to me that most of the wheel slippage is on the rear wheels, so maybe you only need to bypass the rear wheels.

Hum, I wonder if it would be easier to just put a larger engine in the PT.
Bob Rip

 

[stray]

Thanks Guys. This is going to work but it will take two or three weeks to get it ready and see just how well it works. Gosh maybe someone else will have it ready for testing before I do. If so, good luck and more power to them. Its been hard on my brain too. /forums/images/graemlins/tongue.gif

Does anyone have links to (12 volt solenoid Hydraulic valves)

 

[J_J]

Have you considered the fact that with the current 25 hp engine, you are probably pushing the limits of the engine to produce the gpm of fluid that you need to operate everything at the same time. Using a hydraulics calculator, I figure you can pump about 12 gpm max at 3000 psi. If you modify anything, such as a larger tram pump, you may have to go to a larger engine. You can get by with switching to larger wheel motors, and get more torque, but you suffer in top end speed.

I would think really hard on changing all those hyd hose to find out that it isn't as good as what you have now.

I believe that tram pump is in the $1000.00 range, and if you do go larger, you will have to upgrade the current engine which is about $2200.00 to a larger engine which cost even more.

It is very hard to modify a proven concept, and be cost effective, and with more advantages over the old system. What ever you, I applaud your efforts.

 

[Beechwood]

Stray:
I have a new 12 v. solenoid selector valve I was going to use for the curl functions on my minihoe. I decided to spend the extra$ and go with a 3 spool valve. If you go to www.surpluscenter.com the Item # is 9-1782 I paid $189.50 plus shipping. If you are interested in buying it send me a PM.

 

[stray]

I will need two valves or one that acts like two. I think the drawing illustrates the valve. If I can’t find the first 2 position I have to settle on the second 3 position. I have found several of them. I hope I can find some way of doing this job for under $200 but I’m afraid it will cost a little more.

And Hey JJ, come on now have a little faith (LOL) but thanks for your advice and concern. The vales are so one can switch back and forth from the way it is now to the lower gear. I do agree with you that the tractor would be too slow to just leave it piped with all motors in parallel mode. If you get me too worried about doing this I could do like KentT said and repipe it just for a test.

With the right ends on the hoses and fittings one would only need 2 each tees and 2 each hoses. I know it may seem like you would need more but when you narrow it down it looks like that is what would be needed. As you know in the world of hydraulics there are many different kinds, types and sizes of fittings and hose ends.

 

[Phils]

For more power can't we just install a NOX system like the kids do on their Hondas? /forums/images/graemlins/confused.gif

Phil

 

[toolz_not_toyz]

But that would only produce more power at the engine. Isn't the problem here: 1) the wheel motors, 2) the current hydraulic pump, 3) the engine?

I think JJ's point is that to do this properly you really need to consider replacing all three. Did anyone else notice the date on the diagram that JJ posted? 1998. I suppose that means there have been no design changes since other than upgrading the wheel motors on newer PT 425s. Does the 425 also come with a stronger hydro pump now?

Has anyone looked into what the biggest engine is that could be swapped into these tractors?

 

[J_J]

That was STRAY that posted that hyd schematic.