Why not check valves in FEL?

[picker77]

I'm having JD's dual rear remote "bundle" installed in a couple of weeks when my dealer gets the $720 kit he ordered from Deere, and I'll be adding CCM's Top 'n Tilt cylinders for these remotes. Someday I will add a grapple and run some hoses up front for it from one of these remotes.

But in reading the CCM website this question popped into my mind about double pilot operated check valves like those that come on the CCM cylinders: Why don't the curl and lift cylinders on FEL's have these from the factory? Seems like it would cure a lot of the minor and sometimes major FEL drift/leakdown problems I read so often about. Are these something that can be installed aftermarket? I've never heard a peep about this subject, so I'm probably overlooking something important here. If so, please educate me. If these things will work on a 3-pt hitch, which has to deal with a lot more weight than an FEL cylinder, why won't they work on FEL's?

 

[beenthere]

No peeps because there may be no problems here worth the expense of the check valves.

Some say they are not needed on the hyd. top arm either. :confused3:

 

[J_J]

This has been discussed before, and it would be a good idea as far as load security. There are problems with this or they would all have it. I believe the pressure release on the checks is about 500 psi, and that causes some delay, and I believe there was some shaking/chattering of the FEL when using the pilot operated reliefs.

If you wanted load security, you could install hyd needle valves in the lift circuit, and lock it down in the lifted position. This would be useful in using man lift platforms.

 

[MtnViewRanch]

You know about the float position on your loader valve, that would no longer work if you had DPOCVs. I doubt that they would work with the fast dump cycle on the curl cylinders either. So there are 2 reasons that they do not have the check valves.

 

[AKKAMAAN]

You know about the float position on your loader valve, that would no longer work if you had DPOCVs. I doubt that they would work with the fast dump cycle on the curl cylinders either. So there are 2 reasons that they do not have the check valves.

Great points MVR.....I vote it TBN post of today....:thumbsup:

 

[picker77]

Great points MVR.....I vote it TBN post of today....:thumbsup:

Aha! I knew I was missing something on this. Thanks, gentlemen, that makes total sense. I'd certainly not want to give up my loader's float function. The joystick on this 305 loader does have a "Lock" button I can push in that disables the joystick's movements, but it appears to be just a mechanical device that blocks the linkage, and has nothing directly to do with actual fluid flow.

Last question, just for future reference: Re the Dual SCV valve pictured below (from the JD Parts Catalog)--Is the plug I circled in red the power beyond output port on this valve? Or is there even one on this valve? Trying to get myself educated on future PB possibilities after these new rear remotes are installed.

 

[MtnViewRanch]

Picker77, are either of your new rear valves going to have a float position?

Sorry that I can't help out on the PB question. :ashamed:

 

[picker77]

Yes, one of the two will have a float function. The other will not. Not exactly sure what I'll do with float on a rear remote, but that's the way they come. Can't hurt, I suppose. Maybe I'll come up with a reason to use float on a rear implement sometime in the future. My brush hog (Rhino SE5) has a sort of "mechanical" float built in via a swinging upper link that works well, so I'm not sure what I'd use float for back there, but whatever...

If anybody's interested, the valve I referenced in my PB question is the dual SCV valve that actually comes as part of the JD kit my dealer ordered. This picture shows the entire dual rear remote kit, including that valve:

 

[MtnViewRanch]

Yes, one of the two will have a float function. The other will not. Not exactly sure what I'll do with float on a rear remote, but that's the way they come. Can't hurt, I suppose. Maybe I'll come up with a reason to use float on a rear implement sometime in the future.
quote]

Picker77, think about that hydraulic side link that you want, you may not want a DPOCV on it. You can then put the side link into float mode when smoothing a road way or drive. Any ground that may be uneven or has twists in it, for an example when one road Y's off of another and the intersecting areas are not level but sort of twisted. About any implement that you would use on a dirt or gravel surface can benefit from this capability while in a finish grading-smoothing operation. I have many of these areas on our property and this works very well.

Just my experience and what has worked well for me, give it some thought before you buy that CCM hydraulic side link.

 

[picker77]

I'll certainly think that over before I decide whether to have DPOCV on both cylinders. Having never used anything but the old Armstrong cranking method for top and side links before, the idea that a DPOCV would negate the possible benefits of having float on one of the cylinders was the furthest thing from my mind. Very interesting food for thought there, maybe others will chime in.

For me, just getting TnT is akin to handing a caveman a full Snap-On tool set to replace his stone axe. I'll have to ponder more how I might use this new quantum leap in capability!