Cross over relief for snow plow

[Neversosure]

Can anyone recommend a cross over relief valve for my Mahindra 2538 w/ WR Long 3rd function, I have a 7.5' Meyers power angle plow I am mounting to a quick attach plate (shortening the plow frame). I was advised to install a Cross over relief valve in the Wr long circuit for protection in case I hit an immovable object.

Thanks in advance....... I am going to take a look on the surplus page as well......


Matty

 

[Neversosure]

I found it......... :cool2:


Its all right here on Tractorbynet......... if you search long enough you will find it!

 

[BoylermanCT]

Can you share what you found? I have a 7.5' plow with no crossover. I hit an immovable object last storm of the winter and snapped one of the 1" mounting pins on the plow. Now I can't get the pins out of the sleeves to replace it. Will be spending time next week with a torch to try and fix the plow.

 

[George2615]

Here's the one I used.

1/2 NPT 3 GPM 15-3 PSI Hydraulic Cushion Valve | Relief & Cushion Valves | Hydraulic Valves | Hydraulics | www.surpluscenter.com

 

[TMGT]

Here's the one I used.

1/2 NPT 3 GPM 15-3 PSI Hydraulic Cushion Valve | Relief & Cushion Valves | Hydraulic Valves | Hydraulics | www.surpluscenter.com

That's the same one I used on my BH for the swing, little big but works and price is decent.

 

[BoylermanCT]

Can you show pics of how you mounted it? Thanks!

 

[George2615]

I mounted mine in the center of the QA plate where the chain lifts the plow.

 

[PILOON]

The way a crossover valve works on a plow is to transfer the excessive pressure from the extended cylinder over to the collapsed one.
This via the preset relief valving.
Problem is only the extended side of the plow is protected.

When plowing we generally plow snow off to the curb (right) side so that side, the most vulnerable, is really not protected in that it is already collapsed.

In my opinion ,especially on a tractor blade, the better protection is a spring loaded blade that dumps or flips whenever a solid object is met.
Also tractor plowing is usually done at much lower speeds than when pushing with a truck which uses speed to curl the snow off to the curb side.

With your tractor you won't really drive fast enough to curl that snow.

In my opinion money is wasted by installing a crossover on tractor blades.

(I have a plow equipped tractor and did commercial snow contracting with a plow truck)

 

[zzvyb6]

The way a crossover valve works on a plow is to transfer the excessive pressure from the extended cylinder over to the collapsed one.
This via the preset relief valving.
Problem is only the extended side of the plow is protected.

When plowing we generally plow snow off to the curb (right) side so that side, the most vulnerable, is really not protected in that it is already collapsed.

In my opinion ,especially on a tractor blade, the better protection is a spring loaded blade that dumps or flips whenever a solid object is met.
Also tractor plowing is usually done at much lower speeds than when pushing with a truck which uses speed to curl the snow off to the curb side.

With your tractor you won't really drive fast enough to curl that snow.

In my opinion money is wasted by installing a crossover on tractor blades.

(I have a plow equipped tractor and did commercial snow contracting with a plow truck)

I agree with this. My front frame mounted plow still retains the spring loaded trip and functions perfectly. Plus, the typical plow cylinders are not that durable. If you compress them a seal will blow. And, I run in float mode. However, my 1070 running in high gear will curl snow pretty well. When I've done my road (nothing better to do when the Road Commission driver is taking their 2 hour break), I can easily outrun cars that are following me. Once I turn around, they realize there is no place to go after that.

 

[TMGT]

The way a crossover valve works on a plow is to transfer the excessive pressure from the extended cylinder over to the collapsed one.
This via the preset relief valving.
Problem is only the extended side of the plow is protected.

When plowing we generally plow snow off to the curb (right) side so that side, the most vulnerable, is really not protected in that it is already collapsed.

In my opinion ,especially on a tractor blade, the better protection is a spring loaded blade that dumps or flips whenever a solid object is met.
Also tractor plowing is usually done at much lower speeds than when pushing with a truck which uses speed to curl the snow off to the curb side.

With your tractor you won't really drive fast enough to curl that snow.

In my opinion money is wasted by installing a crossover on tractor blades.

(I have a plow equipped tractor and did commercial snow contracting with a plow truck)

I have to disagree to an extent, the purpose of a crossover relief is to protect the hydraulic circuit pressure spikes mainly but can also protect the mechanical parts too.

While it's true that the side of the plow with the collapsed cylinder won't benefit from the crossover valve I've found its usually the extended side that takes the brunt as it catches easier since it's angles forward, the side of the plow angled back usually deflects off an object much easier and doesn't need the protection.

A trip mechanism is important but usually won't help with high loads on the outer most wings as much, that's where the crossover relief comes in.

A lock valve could be used to protect the hydraulics also but cost about the same and doesn't offer any mechanical protection.

This is my experience, and there is a reason most plow manufactures incorporate a crossover relief into their plows.