Crossover Relief Valve

[foggy1111]

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

I hooked mine up this morning.....and everything worked just fine on the first go......and as shown in the above pics and illustrations. I have single action cylinders.

I got some thiings I need to get done yet this afternoon....but will be posting pictures tonight.

 

[PILOON]

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

Well I think the Prince guy is wrong as all FISHER plows use 2 single action cylinders and to tilt left the right cyl pushes out while the left one empties back to tank. If the rt hits an obstruction the valve opens dumping fluid over to the other line hence returning to tank along with the emptying left cyl.

I think they use 2 single actions mainly due to cost.
If you stop to think of it, plow single action cyls are much like a big shock absorber and I believe very cost effective vs one double action.
2 single actions virtually work the same as one double except they apply pressures at different areas.
Instead of 2 SA's you could install 1 DA and get same action with the main differance being where the forces are applied.
My feeling is to use one DA you'd need to beef up some areas as well.

 

[kennyd]

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

Well,the Prince guy is wrong as all FISHER plows use 2 single action cylinders and to tilt left the right cyl pushes out while the left one empties back to tank. If the rt hits an obstruction the valve opens dumping fluid over to the other line hence returning to tank along with the emptying left cyl.

I think they use 2 single actions mainly due to cost.
If you stop to think of it, plow single action cyls are much like a big shock absorber and I believe very cost effective vs one double action.

Yup the Prince guy is just plain wrong. Fisher, Curtis and John Deere all use them, maybe others as well.

No if you have a regenerative circuit on your remote then you can't use SA cylinders at all, but that is highly unlikely in your case.

I am suspecting a bad QD somewhere that is blocking flow-kind of acting like a check valve maybe.

 

[cttractor]

Actually, there's another reason you can't use a DA cylinder for this application, and that's because the cross-port relief must be able to push excess pressure into the opposite cylinder when an object is hit with the blade. That means the capacity of the cylinders must be the same. On a DA cylinder, there's more fluid on the extend side than there is on the rod side of the cylinder. The presence of the rod itself uses up space you'd need for the oil from the higher capacity on the other side. Using two identical SA cylinders resolves this problem.

 

[foggy1111]

My wife and I sat in one of our deer stands tonight....to see if we could watch a good buck in one of our plots. He didnt show....but we watched a doe and had a nice time anyway.

Unfortunately, we forgot our camera with the pics of my plow and hydraulic routing....so I will have to post them at a later time. My hydraulic routing is unchanged from that shown on page 1. When my blade is swiveled from one side to the other....my plow stops just an inch short of hitting the mount frame. Either I was inspired.....or I got lucky (Luck is good. :thumbsup The 12" set-back from the JD pins is the deal!

I had to make a few tweaks to my mount....but it is really a nice set up. Pics in another day or two......as soon as I get back to my land to retrieve my camera.

 

[Mike_VT]

So last night I when I got home I went out to the shop....still scratching my head knowing that the relief valve should work! So I bi-passed the valve and plumbed the hoses directly from the cylinders to the working hydraulic ports serviced from the rear remotes. The result were the same, hydraulic fluid pooring out of the quick connect service ports (WTF).

Come to find out both male ends on the hoses were malfunctioning, what are the chances of that! So I relplcaed the connectors (both pioneer 4010-3P) plumbed in the valve and gave it a whirl. Everything worked as it should!!

If you never try anything nothing ever goes wrong.

The plow started out as a pile of junk that I picked up for $200 included with the plow was a sorts of steel that I scrapped for $70. Attached are some pics of the finished product.
Total cost of the project was $545. (Plow 200, Steel $150, valve $80, hoses and fittings $105, paint and primmer $20 (rustoleum), welding supplies $50, decal $10, salvage of steel ($70).

On the other end of the tractor I put a 78 inch agro trend snow blower with a hydro shoot......Now we need some snow.

Mike

 

[Mike_VT]

Not sure what happend to the pics.

 

[foggy1111]

Glad you got the problem figured out. Looks like your ready for action now. Nice job on the plow build....and your costs are certainly in line. :thumbsup:

Seems I got an old thread that I thought may be better to post my pics to. See my "Meyer Plow" thread which has the mounted pics.

 

[bubbacuse77]

Froggy,

We have the the same set up for tractors and I was wondering what connections you have up on the FEL. I had the dealer put Flat Face on when I bought it but not realizing they put on 1/2" flat face fittings. They seem like over kill and fitting for every attachment get more expensive with the larger fittings. I also think JD did a poor job of supporting the hardlines and fittings on the FEL. I want to add some sort of plate to keep the fittings from moving around so much. am always worried about breaking a or bending a line. I also am considering a going to 1/4" or 3/8" flat face.

 

[foggy1111]

Froggy,

We have the the same set up for tractors and I was wondering what connections you have up on the FEL. I had the dealer put Flat Face on when I bought it but not realizing they put on 1/2" flat face fittings. They seem like over kill and fitting for every attachment get more expensive with the larger fittings. I also think JD did a poor job of supporting the hardlines and fittings on the FEL. I want to add some sort of plate to keep the fittings from moving around so much. am always worried about breaking a or bending a line. I also am considering a going to 1/4" or 3/8" flat face.

I have the JD Hardlines kit on my loader. It has 1/4" Pioneer quick couplers at the front of the loader......and it also has them near the middle of the tractor, close to the Joystick Couplers. This middle of the tractor QD allows me to swap lines when using another implment - or to disconnect when removing the loader.

Your right about not having much support at the front.....and I would like to add some kind of a support bracket for my couplers too. Allthough I have not yet had a problem with 'em.

My grapple also came with the large Flat Face Connectors. I swapped em out for the JD / Pioneer style - as they are lighter weight. The small Pioneer couplers arent cheap either.....I think a pair of em costs $35 over the Deere parts counter. Not widely available due to the small size.

I also worry about breaking hydraulic lines....mostly when I have my grapple on in the woods. I have had some problems with damaged lines on my old tractor....but the lines are better protected on these loaders....and I keep closer watch these days.