Steering logic.

[J_J]

Next time you are on the machine, do this test. While turning, pull back on the lift handle. Turn the wheel back and forth and see if the lift stops until you have stopped turning.. Mine does.

 

[Gravy]

I assume that it's intentionally prioritized that way. From a safety/liability standpoint, I'd think steering would have to take precedence over attachment lift/tilt. I can see more likelihood of a lawsuit over a steering failure than a lift/tilt failure. Personally, I'd prefer independent circuits for each, but that would likely add complexity and cost.

Dave

 

[BobRip]

When I took the class at Tazewell in 2000, I was told that the steering intentionally had priority. At least that's what my memory says.
I am attaching a picture of a drawing of the steering hydraulics from the manual. I hope this helps. It looks to me that when you steer to the stop the flow is stopped to the lift/ tilt valve bank and the releif valves opens for this pump. This is my assumption.

Bob Rip

 

[BobRip]

Did anyone else take the class on the PT in Tazewell? I learned a lot, and yet I don't think anyone else has referred to it. Do they still teach it?

Bob Rip

 

[Spiffy]

I'm not quite sure how the class was done when you had it, but was pretty impressed this summer.

The mechanic that gave us the demo just went through all the critical points and Q&A after I got through demo-ing.

My books don't have that schematic, but I'm guessing they're pretty similar.

 

[Spiffy]

J_J

Maybe I'm not conducting the test right or maybe there's something plumbed "wrong" in my machine, but except for the very ends of steering wheel travel (which is beyond full articulation), it doesn't seem to matter whether I start steering while lifting or start lifting while steering, it lifts a slight bit slower, but keeps lifting.

 

[cqaigy]

<font color="red">steer to the stop the flow is stopped to the lift/ tilt valve bank and the releif valves opens for this pump. This is my assumption.
</font>

Ditto. I assumed that this is what was happening. i.e. relief valve opening taking pressure from the lift circuit.

 

[cqaigy]

Spiffy,

My machine acts the same way. Stop lift at full turn, slower lift when turning but not at full articulation and full speed turn when sitting still.

 

[J_J]

From looking at the hydraulic circuit, I don't see why one could not tee off the output of the pump through a relief valve, and one hose to go directly to the lift and tilt valve, and the other hose back to tank Then, just put plugs in the steering valve where the lift and tilt circuit was. They would then be equal.

Parts 1 relief valve.
1 tee.
2 short hoses and fittings.
2 plugs

 

[Spiffy]

Looks like a good plan to me J_J. I'd have to look at the schematic again, but since you're going in parallel, the additional relief may not be required. Let us know how it works out! /forums/images/graemlins/smile.gif Mostly just curious, since mine doesn't bother me, that's a mod I can proably skip.

MR: You guessed it; I'm contemplating a rear joystick to make BH life easier. Also would be great if I ever mount a 3pt blower; I think it'd be a snow moving machine with a blower on one end and snow bucket on the other. /forums/images/graemlins/grin.gif