YM1401D 3ph goes up ok=down no go

GrenAkrsFrmr · Dec 20, 2004

Thanks for the reply, but I don't think that's the problem. I can't get the 3ph arms to move down even with considerable weight attached to them(me standing & bouncing). So I'm still at the point where I need to break the connection in the high pressure line at the control thingy. If anyone has done this before PLEASE contact me. You can see the connection in the attachment to my prev. post that shows this connection. Also I need to know the procedure on hooking everything back up so my hydraulic pump is primed, etc. So I don't cause more problems than what I have now. Thanks.
still confused /forums/images/graemlins/confused.gif

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jimstractors · Dec 20, 2004

Sometimes if the 3PT goes up too high, the piston inside can come out of the cylinder, not allowing the 3pt to go down. This happened on a 1502D I had. It was due to the fact that the 3pt limit adjustment (up) was not set right and allowed it to go too high up, thus allowing the pistion to pop out. Here is a pdf file of the 1401 3pt.

GrenAkrsFrmr · Dec 27, 2004

Thanks to everyone for your info, help, & advice.
BUT, I still need HELP, especially to the questions I ask in my 12/20/04 post. Right now the weather & time are preventing me from farther explorations (and also still the need for more info). So please keep the info coming.
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normde2001 · Dec 27, 2004

You can separate the line at any point that has a connection. It's just plumbing.

GrenAkrsFrmr · Jan 8, 2005

THANKS, !! I did separate the high press line at that point and finally got the 3PH control thingy off of the tractor, hope to be able to get the filter on the bottom return line removed & cleaned out today(depending on the weather) & hopefully get everything back together, But I still have 1 lingering question. /forums/images/graemlins/confused.gif

Will I have to do anything special to make sure the Hydraulic pump is primed??????

Like bleed the system or anything like that??? If so will someone please let me know/ If not then someone please let me know that also?? But if so, what are the steps I need to take to preform such a task?? and how do I go about doing them??
THANKS, cause I need your help. /forums/images/graemlins/grin.gif

GrenAkrsFrmr · Jan 24, 2005

Please, Someone respond = Please.

I found = so far= the hydro piston had hit something & bradded out on the bottom and got weiged (had to beat the piston out & grind off the damaged part of piston- best I could tell the sleeve was not damaged except at very bottom lip, so I adjusted length of stroke to not go past the damaged area) in the hydrolic piston sleeve. That is all taken care of now & adjusted so it wont happen again (I hope). I also hope this will fix my problem, but cant be sure till I get it all back together. which brings me to a question I still need answered

= Priming hydrolic pump???=

My Previous post=
THANKS, !! I did separate the high press line at that point and finally got the 3PH control thingy off of the tractor, hope to be able to get the filter on the bottom return line removed & cleaned out today(depending on the weather) & hopefully get everything back together, But I still have 1 lingering question.

Will I have to do anything special to make sure the Hydraulic pump is primed??????

Like bleed the system or anything like that??? If so will someone please let me know/ If not then someone please let me know that also?? But if so, what are the steps I need to take to preform such a task?? and how do I go about doing them??
THANKS, cause I need your help.

PS Forgive the spelling, the spell checker seems to be temp on the blitz.

mark777 · Jan 24, 2005

GrenAkrsFrmr,

Since you cleaned hydraulic filter and replaced fluid (and it is full), and you have no hydraulic attachments, then bleeding the system is not necessary.

Just start, let warm up for 5-10 minutes and operate your lift arms...check fittings and gaskets for any leaks.

Regards, Mark

GrenAkrsFrmr · Jan 25, 2005

THANKS, Mark,

That is what I needed to know. I will give it a try (hopfully this week-end) and let you know.
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GrenAkrsFrmr · Mar 8, 2005

***-Ray !!!

I got it all back together and it works great. I hooked up my JD finishing mower to it Sat. Afternoon & left it in the up position & by Mon. afternoon it had only dropped about an inch. I thought that was pretty good, seeing I had reused all the original O rings, gaskets, etc.

Anyway the Piston slipping out of the cylinder and cocking sideways and damaging the piston & cylinder as mentioned in my earlier post was not the original problem. This was one I created my self by messing with the limit control adjustment trying to get my 3ph to go down(big mistake on my part), But I was still able to reuse all these parts after grinding the burrs off.

I think my original problem was probably a piece of trash.

If you have the parts manual or look at the pdf file sent to me on an earlier post, the part # 15 on page 43. was not operating. It fits into the side of control valve where T handle # 2 can be adjusted to keep it seated (at ver-a-ring degrees) into the control valve to control the drop rate of your 3ph. Fully seated = no drop at all.

You should be able to cover up some holes with your fingers and blow into the control valve with the valve arm in the "down" position and the part # 15 should blow out of the control valve, mine would not. What the manual does not show is that on the control valve shaft(which has no part #), there are some very small holes, I took a small piece of wire and poked in all of these. It must have dislodged something cause when I blew into the control valve again, part # 15 shot out onto the floor. I could hold part # 15 seated and that would stop any air flow, which is what it is suppose to do. So long story short, I put it all back together & it works great.

Also an FYI = if you should loose any of your metric thread bolts, John Deere has a pretty good supply.

So, Hey, I most sincerely want to thank everyone (especially, Mark77, Normde2001, gbirky, Sourmash2, Bruce1966us, & JimsTractor) that tried to help me, without your help no telling what kind of shape my tractor would have ended up in.

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