Hydraulic maintaince questions

[woodlandfarms]

As I had to replace all my wheel hoses, I found that it was a very simple circuit. From pump to front motor then hose to back motor, then back to pump. Same for both sides...

It would make parked crabbing a lot easier....

 

[SnowRidge]

As I had to replace all my wheel hoses, I found that it was a very simple circuit. From pump to front motor then hose to back motor, then back to pump. Same for both sides...

I think all the current models are plumbed that way. The two sides are fed in parallel, while the front and rear wheels on each side are fed in series. This provides a limited slip function front to rear and a more or less standard differential function left to right. In the end it means that as long as one wheel has traction, you can move.

I think it's a good system. These things are really hard to stick.

 

[woodlandfarms]

Snowridge... Got it.. but now I am confused why there is this T on Peters system. And why it does not exist on mine (I promise I am not being a cry baby). And if this T makes sense to installl... Simple plumbing it looks like... Can't wait for someone to come online with a new 1850...

 

[ponytug]

The Tee goes L<-->R. I think it acts as a limited slip differential, i.e. some flow can move left/right if there is an imbalance, but not alot, since this is a 3/8" hose.

The attachment shows (albeit poorly) the pump setup; there are two circuits joined at the pump with a right angle into a tee. The green arrows show the two hoses entering port 1, the yellow arrow shows the location (somewhat hidden) of the second set of right angle entry and tee ports. One hose from the green circuit goes to the right rear pump and then a hose connects the right rear to the right front pump. (Not visible from this view are the charge pump inlet, and the pump drain to the tank.) The Tees at the pump keep both circuits at the same pressure, but enable full pump flow to one circuit, if the other stalls.

Thus, stalling one motor, e.g. the front right, will direct the full output to the front left, and thence to the left rear, which will return it to the pump. The aluminum "Tee" will enables some of the fluid and to enter into the right rear, limited by the fact this is a 3/8" hose.

Does this help?

All the best,

Peter

Snowridge... Got it.. but now I am confused why there is this T on Peters system. And why it does not exist on mine (I promise I am not being a cry baby). And if this T makes sense to installl... Simple plumbing it looks like... Can't wait for someone to come online with a new 1850...

 

[J_J]

Check out post #15. hyd schematic for 1850

http://www.tractorbynet.com/forums/power-trac/13330-power-trac-traction-2.html

 

[woodlandfarms]

JJ. That schematic does not apply to my PT.. Bummer. I don't have the T Valves...

Peter, your system looks nearly like mine. I will call Terry and see if there is any value me rigging up that sort of connector you have...

 

[J_J]

JJ. That schematic does not apply to my PT.. Bummer. I don't have the T Valves...

Peter, your system looks nearly like mine. I will call Terry and see if there is any value me rigging up that sort of connector you have...

Carl.

Just what do your wheel motor lines connect to? It has to be a tee or a manifold of some kind. You have to split the fluid between the two back wheels, and the two fronts, or between left back and left front, or left front and right back. Even if you have all wheel motors running individual lines to a manifold, it is still acting as a splitter.

 

[J_J]

Check out post #15. hyd schematic for 1850

http://www.tractorbynet.com/forums/power-trac/13330-power-trac-traction-2.html

This schematic is for an 1850, July 1996 and later.

 

[woodlandfarms]

My plumbing is quite simple. The tram pump has 2 inlets and 2 outlets. Basically a hose goes from the tram pump to the front wheel, from the front wheel to the rear wheel, from the rear wheel back to the tram pump. Same on the other side... No T's.

 

[SnowRidge]

The tram pump probably has internal Ts, possibly with anti-backflow valves. Do you have a make and model number for it?