cross over relief valve...

[gravelman]

i just purchased a Prince cross over relief valve that i want to mount on my snowplow push frame. did not come with any intstructions. Are there any instruction videos etc for this item??? It is marked C-512 and has the A B C D ports etc. thanks for any an all guidance..

 

[the old grind]

This from a Prince valve manual for motor or cylinder(s) with dual relief valve. Not the only way(s) maybe. Looks like both sides are bidirectional with 'line' on one side and 'load' on the other. To me, the hookup to SA cyls suggests they're opposing. (implement rotation, steering, etc) The motor circuit is plumbed the same way for bi-directional use. How about to a cylinder or pair then?

 

[gravelman]

This is EXTREMELY HELPFUL...thank you very much

 

[Zebrafive]

A&C to the valve
B&D to the cylinder

 

[PILOON]

Note that when used on a snowplow, only the extended blade end is crossover protected.
If you are plowing snow away from the curbs your protected but the normal practice is to push snow to the curbside (right) and that right side is always fully retracted and un protected.

(I once had a large tractor that was crossover equipped with a major repair on the right loader arm caused by the driver ramming a curb while plowing.)

Now on a straight pusher type blade both corners would be protected with a crossover.
Like for clearing large parking areas, but then speed would still be your enemy and commercial lot clearing is a always a speed exercise.

 

[gravelman]

got em both..thanks very much

 

[Gordon Gould]

One thing that can be very confusing if you don't know is that the relief pressure adjust screw on the A-B side adjusts the relief pressure in the C-D line and visa-verse the screw on the C-D side adjusts A-B relief pressure. Don't ask how I know.

gg

 

[RickB]

Note that when used on a snowplow, only the extended blade end is crossover protected.
If you are plowing snow away from the curbs your protected but the normal practice is to push snow to the curbside (right) and that right side is always fully retracted and un protected.

(I once had a large tractor that was crossover equipped with a major repair on the right loader arm caused by the driver ramming a curb while plowing.)

Now on a straight pusher type blade both corners would be protected with a crossover.
Like for clearing large parking areas, but then speed would still be your enemy and commercial lot clearing is a always a speed exercise.

A good example of why a loader mounted plow is a (poor) compromise between function and convenience. Loader booms are not designed for the lateral forces exerted by an angled plow.

 

[gravelman]

Ok on all that. thanks

 

[LD1]

Note that when used on a snowplow, only the extended blade end is crossover protected.
If you are plowing snow away from the curbs your protected but the normal practice is to push snow to the curbside (right) and that right side is always fully retracted and un protected.

(I once had a large tractor that was crossover equipped with a major repair on the right loader arm caused by the driver ramming a curb while plowing.)

Now on a straight pusher type blade both corners would be protected with a crossover.
Like for clearing large parking areas, but then speed would still be your enemy and commercial lot clearing is a always a speed exercise.

Crossovers are designed to protect the hydraulics and the angle rams from pressure spikes. They are not designed to protect the tractor.

When angled as you describe....and curb side cylinder is fully retracted....there is minimal to no risk to those hydraulics or cylinder on that side. That is where the trip springs come into play.