JD 5400 Third SCV only works one port

[toddsd]

I bought a used John Deere 5400 a year ago. It has 3 sets of hydraulic fittings on the back, labeled I, II, and III. All are connected on the back side, but there is one additional hose coming from the area of the valves and connected to another hose going back under the valves...the connection is held up with a rubber snubber on the back (kind of weird, but not sure what it is). I had the dealer install a new loader, connected to scv's I and II, and runs off the joystick...works great.

I just upgraded to a bale spear with a grapple, and ran hoses back to scv III, but it appears to only work in one direction. I went through the hoses and ram, and everything after the scv is fine. The lever inside the cab is all the way "back", and if you push it forward, it engages the hydraulic and extends the ram, but pull it back and nothing. I switch the hoses, push the lever, and the ram retracts, but again, nothing the other way.

Looked through the manual, and it shows everything working both ways. The graphics at the scv show a picture of the ram with an arrow out at the top fitting, and the ram with an arrow in at the bottom fitting.

I know I'm slow, but it looks to me like everything is supposed to work bi-directionally. The dealer (in another town) apparently believed it was bi-directional also, told me I could run the baler off the third scv and tried to sell me a bucket with a grapple.

Is there a different type of valve that could have been installed that only works one way? Is there possibly a simple plumbing fix that would convert this back to two way operation? If I buy the manual for the third scv, would it show how to convert the valve back to two way operation? I'm considering purchasing one of the electrical splitters to use on one of the working scvs to operate the grapple, but would rather fix the third scv if it isn't too tough.

 

[JD5210]

I looked in the tech manual for 5X10 and as you stated the lever for the third SCV should extend and retract the cylinder of what it is connected too. The third SCV like the first SCV has a float detent in it. Here is my suggestion, switch what you have between SCV 1 and 3 and see what happens. If the problem remains on the third SCV check the connection between the control level and the value. Seeing you have a cab tractor, this maybe a pain as you may need to remove the fender. I have included a link to JDparts which may help you figure out how this hooks up. If you would like to send me a private message with your e-mail address, I can e-mail you the installation manual LV10017 for the 5400 for that third value, that another member was kind enough to sent it to me awhile back.

While a picture would be helpful, I think that hose that you spoke about is for the power beyond. Looking at JDparts may help you determine that. I do believe this hose has to be connected/loop back correctly for things to work correctly. Post a picture and I will look in the 5X10 tech manual, which in this area is the same as I can see it for the 5X00 and see which ports the hose needs to be connected too.

John Deere - Parts Catalog

You may also want to look at selectmanuals.com for a download version of the tech manual $29.95.