Hello all and assistance needed with a pt1430

[woodlandfarms]

I wonder.... and I am probably off beam on this, if something in the right isn't bypassing. Meaning the right front or rear left motor are bypassing. You have spin on the front left, so pressure is pretty strong (or strong enough) to make the wheel spin. OP mentioned he could put is foot on the right front tire and stop it with down pressure. One wheel would totally kill the PT ability to move (having been high centered with one wheel off the ground).

 

[MossRoad]

Two wheels are in series, making two series circuits.
Those two series circuits are in parallel with each other.
In a parallel circuit, there's two paths for the fluid to take.
The fluid will take the path of least resistance.
It sounds odd, but the wheel that is spinning is in the weaker circuit at the moment.
It is getting fluid because the other circuit has too much resistance to overcome at the moment.
I say "at the moment" because its dynamic.

 

[RegL]

On my 2003 pt1430, the front and rear motors on the same side are in series. I've had wheel motors stall on steep slopes, however when giving more treadle the engine should bog down. Do you have an older tractor with hydro back. If so, you might want to check the linkage, cable , and hydro back unit to see if you have full range of travel. Does the tractor behave the same in reverse?

Sent from my iPhone using TractorByNet

 

[ponytug]

MR you are right, the rears should be driving the tractor up the hill, but the loading on an empty PT is such that there is more weight on the rear, so the fronts will be the first ones to spin. (Same torque, less weight, therefore less friction, so first to spin out.)

I can't tell from the video; is that wide ope throttle? The engine sounds OK from the video, just not full speed. Nevertheless, if the pumps and motors were engaging, I would expect to hear it bog down, and it doesn't. See my prior post for ideas on root causes.

I don't know if it helps, but here is a little on the function of a variable displacement pump. If you want to look at how the drive pump for the PT functions, look at these links;
Axial piston pump - Wikipedia, the free encyclopedia

I'm a slow learner sometimes. It took me a time to unlearn "stomping" on the treadle for more power. For PTs, when you need more power, you need to lighten up on the treadle to devote that HP to less oil. When the treadle moves, it moves the swashplate on the main drive pump, which is a variable displacement pump, varying from 100% reverse to 100% forward. There's a nice animation here:
http://www.youtube.com/watch?v=2mh902AP7Yw
Basically, the power that we have to work with is set by the throttle, and then we get to choose whether we want a lot of power in a little oil (e.g., 5% treadle, WOT) for hill climbing, or dividing the HP over lots of flow (treadle to the metal) for full speed on level ground.

All the best,

Peter

 

[MossRoad]

I think the OP is operating the treadle correctly, letting off to get more power. There's most likely something wrong with the pump or wheel motors, but he should do the preventative maintenance first, to eliminate clogged filters, screens, etc...

 

[Russ321]

Guys, thanks again for all the input. As suggested, I'll try all of the maintenance items first. In the video the the throttle lever was wide open, but I do need to check all the linkage.

I have not tried going up the hill in reverse but ill do that in the next few days, ill also throttle the engine back and see if it bogs at all or stalls on an uphill. If I find anything out of the ordinary ill post another video.

Hopefully I'll get a little spare time soon to start really making progress. I'll be sure to post pictures of the progress.