Crossover Relief Valve

[rayclar]

Foggy are you powering the angle cylinders from rear remotes? If so what diameter hose would you use?

 

[foggy1111]

Foggy are you powering the angle cylinders from rear remotes? If so what diameter hose would you use?

I will operate off my rear remotes.....but I have the JD hard-lines kit that runs to the front of the loader mast....and use these same lines for my grapple. I think these lines and quick couplers are the equivalent of 1/4" hose.

I use 1/4" hoses from there.....and that seems to do a good job on my grapple cylinder. I think you could go either 1/4 or 3/8" and get similar performance.....however I prefer the marginally slower operation the 1/4" lines afford. To me they are compact and allow more precision for operation.

(If you do go to the larger 3/8" hoses....and feel you want slower operation you could always add a flow restriction in the line.)

 

[PILOON]

Just a cautionary note.
The crossover valves will only protect the extended (fwd) corner of your blade as operationally the extended cylinder under shocks or strains dump the fluid over to the retracted cylinder.
Otherwise said, if pushing snow to the right or curb side and you hit the curb there will be no protection as that side is already retracted.
If plowing away from the right curb a you catch it, the plow blade will flip and that snow will end up on the right side.

 

[foggy1111]

Just a cautionary note.
The crossover valves will only protect the extended (fwd) corner of your blade as operationally the extended cylinder under shocks or strains dump the fluid over to the retracted cylinder.
Otherwise said, if pushing snow to the right or curb side and you hit the curb there will be no protection as that side is already retracted.
If plowing away from the right curb a you catch it, the plow blade will flip and that snow will end up on the right side.

Good point. Catching on the side which is angled away allows the plow to slip away more easily. I don't have curbs to contend with....but I have tree stumps and roots to hang-up on. That's one reason for the tube on the cutting edge....to provide floatation and to reduce catching the cutting edge on stuff.

As been said: "an ounce of prevention is worth a pound of cure". :thumbsup: One would think that a floating plow with a round tube over the cutting edge, a spring-loaded trip-blade, and a crossover relief valve....that life is pretty much as good as it gets. Still, stuff jumps out to bite ya every now and again. :laughing:

 

[Mike_VT]

I recently just bought the same valve for a fisher plow that I converted, very similar build to yours except with a QA skid steer plate. Today just tried to install the hoses with the valve. I a running the hydraulics off a rear remote that is plummed up front with quick couplers. I have tried a bunch of different "plumbing" senarios with no luck at all.

From the illustration it seems that ports B and D should connect to the hydraulic plow cylinders and the A and C should go to the quick coupler (rear remote). When I set it up this way pressure builds and then hydro fluid releases from the quick couplers.

How did your plummbing set up work? thanks Mike

 

[kennyd]

I recently just bought the same valve for a fisher plow that I converted, very similar build to yours except with a QA skid steer plate. Today just tried to install the hoses with the valve. I a running the hydraulics off a rear remote that is plummed up front with quick couplers. I have tried a bunch of different "plumbing" senarios with no luck at all.

From the illustration it seems that ports B and D should connect to the hydraulic plow cylinders and the A and C should go to the quick coupler (rear remote). When I set it up this way pressure builds and then hydro fluid releases from the quick couplers.

How did your plummbing set up work? thanks Mike

Sounds like you have it hooked up correctly. Does your blade have two SA cylinders?

 

[Mike_VT]

Each plow cylinder has one port on the end so they are SA, maybe I have a faulty cushion valve? The tractor is new so I hooked up my grapple to make sure the rear remote valve was working properly and that worked perfectly. The grapple does not have any cushion valve just two SA cylinders that open and close.

The tractor is a kubota 4740 hstc.

 

[foggy1111]

Mike, IIRC mine is "plumbed" just like yours. I plan to put my plow on this morning.....and hopefully will report tonight on how it works. I plan to snap a few pics too.

 

[cttractor]

Wow! Nice job, Foggy.

This is an interesting project and similar to one I'm beginning (and wish I had more time to do during the summer when I don't need it for snow).
In my case, I plow snow with my bucket and use an angled rear blade for clean-up.
The blade can spin 360 degrees and is held in place by a sheer pin.
For my project, I'm adding hydraulic angling to the blade.

I'm currently working with a hydraulic engineer to see if we can find a slow-speed hydraulic motor to use rather than two SA cylinders -- he believes we can.
If true, I'll be able to maintain full positioning and continue to use the blade forwards or backwards at any angle.
<p>
I, too, will be adding a cross-port relief valve and won't have a problem if the retracted side hits something immovable, such as the curb mentioned in Piloon's important warning.
Of course, if we can't find a hydraulic motor that can handle this job, I'll have to use cylinders also.

Regardless, Foggy, you've done a good job and your setup looks great!

 

[Mike_VT]

I just spoke with a service tech at Prince and they told me that this valve will not work with SA cylinders. I explained the application as well as how I plumbed the valve and they verified that it would not work on the SA cylinders.

Let me know how your set-up turns out. I still not convinced that I have it right? Thanks. Mike