JD 435 Touch O Matic jumping up and down

Hey Guys
My 435 started having problems today with the three point. Using a 4 foot tiller today the 3 Point started jumping or bouncing up and down. At one point it was stuck in the up position. I removed the leakage from the selector and got it back down. We then used it for about 20 minutes. After that it started bouncing again and broke the load control arm. (I believe that's what the arm is called. It comes from the back and connects to the linkage that attaches to the selector.) Oil level is correct and I changed the oil last year with 20W non-detergent Valvoline. Could not find 10W. Anyway I have repaired the arm by welding grinding and re-drilling the hole for the pivot ball. That fixes the arm but not the cause of the problem.

Has anyone had the problem or got any thoughts?
Thanks
 
I am assuming it is like a 420 and probably dual tom.

First thing i would do is lock out the draft control.

Then grab the linkage that b&d is talking about and pull all the slop forward and see if it settles. Maybe the spring is missing that he referenced?

Lastly if it is set for dual i would unpin the lift levers and try it in single tom. My 420 settled down in the single mode and i never needed the extra lift of the dual anyway.
 

Good Morning Buickanddeere
I am not sure of the preload of anything at this point. I am reading the manual and trying to understand how it all works. I have a single cylinder Tom and I only have one spring between the lift arm and the bottom on the right rear. Reading through the manual and looking at pictures I believe "I have parts missing'. The control arm flops up and down like a fish and I think there is a spring stud and nuts missing. Also in another picture it looks like there should be a spring under the control arm toward the selector lever. I am not at the tractor today but I will post pictures of what I have on Monday Lord willing. I am also looking for better pictures of what it should look like. So if anyone has them and could post them that would be a great help.

Thank you for your help
David
 
(quoted from post at 19:06:54 09/06/18) I am assuming it is like a 420 and probably dual tom.

First thing i would do is lock out the draft control.

Then grab the linkage that b&d is talking about and pull all the slop forward and see if it settles. Maybe the spring is missing that he referenced?

Lastly if it is set for dual i would unpin the lift levers and try it in single tom. My 420 settled down in the single mode and i never needed the extra lift of the dual anyway.

Hey Dave
This is a single Tom and thank you for chipping in.
I believe you are correct in that the spring (among other parts)is missing. I am going to start looking to see if they are available as well as if I can get better pictures of what it should look like.

Thank you
David
 
(quoted from post at 20:46:00 09/06/18)
Good Morning Buickanddeere
I am not sure of the preload of anything at this point. I am reading the manual and trying to understand how it all works. I have a single cylinder Tom and I only have one spring between the lift arm and the bottom on the right rear. Reading through the manual and looking at pictures I believe "I have parts missing'. The control arm flops up and down like a fish and I think there is a spring stud and nuts missing. Also in another picture it looks like there should be a spring under the control arm toward the selector lever. I am not at the tractor today but I will post pictures of what I have on Monday Lord willing. I am also looking for better pictures of what it should look like. So if anyone has them and could post them that would be a great help.

Thank you for your help
David


Okay Guys
I am not sure why I have so many problems finding how to post on this site but this is why I am replying this way.

After going to the camp Monday and Tuesday to put in food plots I looked at the 435. The Spring M2212T and Stud M2200T as well as the locking nuts are missing and I can't find them. We have 10 acers of food plots and I have driven all of them this week. I contacted JD and the spring is not available. I do not know of anyone who has one but this is the first step I beleive. If you know of a JD junkyard plerase pass it along to me.

Thank you again
David
 
(quoted from post at 18:43:16 09/06/18)
How much preload on the “load and draft “ spring located under the upper link pivot point ?

Good Afternoon B&D
Just to get you up to date on what I've leaned! I did not know what you were talking about when you asked about preload. But you and Dave H got me on the right track. Dave was correct that the spring is missing. I am not sure when the stud and spring came out but they are gone. We have had some problems with the lift but not to this existent. I am sure it has backed off over the past year and I was not smart enough to know what was going on. "expense mistake". I got the parts book out and the manual to see what Y'all were talking about then I got on the internet and started looking for parts.
I finally found the spring and it is on the way. JD said the stud is available but it's $77 so I am still looking to see if I can locate one cheaper or make my own. It looks like it's a 5/8 stud but I'm not sure how long it is yet. I may need help with the preload but I have the manual as a start.
Thank you both for your help and I hope by this weekend I'll have her back together.
 
(quoted from post at 01:18:16 09/23/18) Thank you for the update . Please keep up posted on the progress . I like those 435’s.

Yes Sir I will.
Do you know how long the 5/8 stud is that holds the spring in place and is used to preloads the spring. I am thinking about making one but don’t know the length. I thought I could put a rod in and measure the death but it looks like the hole goes into the case.
Thanks
David
 

Good morning guys
Just got back to working on my 435D and I have run into a few problems. I found the spring I needed to set the preload and made a stud. Reassembled everything and the hydraulics lift would not work at all. I could raise the arms manually with the selector in the full a position and they would stay in position. I could move this selector down incrementally and it would stop wherever I chose but would not come back up. Oil level was correct engine running, warmed up and running full throttle. I assumed I had low or no pressure, so I performed the pressure test as outlined in the book. Zero pressure and very little flow even with the gauge disconnected and the half inch plug hole open. Yes, I did install the 3/8 plug down in the bore. Assuming I had a bad pump, I disconnected the line and attached my pressure gauge to the outlet side of the pressure pump. With the engine stop pulled out and turning the engine over, I had a dead head pressure of about 1500 PS I. Which tells me I have a good pump but either a blocked line or bypass leaking in the unit or some other issue internally. Removed the line at the pump and I ve got good flow and pressure. Because I had problems with it jumping up and down my friend was convinced that it was in the control unit and he has taken it apart. OIL is now everywhere! Everything looks clean and nothing seems to be broken or bent inside the front housing. I am headed back to the shop this morning to pull the unit off the tractor. FYI this is a dual cylinder TOM and I thought it was a single. It only has one control lever.
Thanks in advance for your help and I ll be happy to answer any questions I can.
 
(quoted from post at 09:22:44 06/26/19)
Good morning guys
Just got back to working on my 435D and I have run into a few problems. I found the spring I needed to set the preload and made a stud. Reassembled everything and the hydraulics lift would not work at all. I could raise the arms manually with the selector in the full a position and they would stay in position. I could move this selector down incrementally and it would stop wherever I chose but would not come back up. Oil level was correct engine running, warmed up and running full throttle. I assumed I had low or no pressure, so I performed the pressure test as outlined in the book. Zero pressure and very little flow even with the gauge disconnected and the half inch plug hole open. Yes, I did install the 3/8 plug down in the bore. Assuming I had a bad pump, I disconnected the line and attached my pressure gauge to the outlet side of the pressure pump. With the engine stop pulled out and turning the engine over, I had a dead head pressure of about 1500 PS I. Which tells me I have a good pump but either a blocked line or bypass leaking in the unit or some other issue internally. Removed the line at the pump and I ve got good flow and pressure. Because I had problems with it jumping up and down my friend was convinced that it was in the control unit and he has taken it apart. OIL is now everywhere! Everything looks clean and nothing seems to be broken or bent inside the front housing. I am headed back to the shop this morning to pull the unit off the tractor. FYI this is a dual cylinder TOM and I thought it was a single. It only has one control lever.
Thanks in advance for your help and I ll be happy to answer any questions I can.

The 435 has an open Center Hydraulic system. The pump only "makes" pressure while the hydraulic oil is pushing against a load .
 

The 435 has an open Center Hydraulic system. The pump only "makes" pressure while the hydraulic oil is pushing against a load .

My apologizes but I don't understand what that means. I know the oil is flowing somewhere and if it is restricted will build pressure. I can't tell where or what meters or diverts the fluid into what passage.

Thanks
 

Closed Center is a little bit like a rural water supply pressure system . Always up to pressure and ready .
Open Center when no hydraulic loads are being used . The oil is drawn from the reservoir, through the pump, through each hydraulic valve , to the next valve , to the next valve etc and back to the sump.
When a valve is operated . Instead of the oil flowing unrestricted in and out of the valve . The valve closes it s port back to the reservoir and instead diverts the oil to a hydraulic ram or hydraulic motor etc . Oil leaving the hydraulic ram or hydraulic motor passes through any other valves downstream and back to the reservoir.
 
(quoted from post at 01:15:27 06/28/19)
Closed Center is a little bit like a rural water supply pressure system . Always up to pressure and ready .
Open Center when no hydraulic loads are being used . The oil is drawn from the reservoir, through the pump, through each hydraulic valve , to the next valve , to the next valve etc and back to the sump.
When a valve is operated . Instead of the oil flowing unrestricted in and out of the valve . The valve closes it s port back to the reservoir and instead diverts the oil to a hydraulic ram or hydraulic motor etc . Oil leaving the hydraulic ram or hydraulic motor passes through any other valves downstream and back to the reservoir.


Thank you buickanddeere
Okay that makes sense to me. The Oil is coming into the unit but in my case, it is not being restricted and delivered to the pistons to raise the rockshaft. So, where or what blocked the oil is it the control valve? The control valve feels like it works and will lock the rockshaft in place if I move it manually. Everything in the front unit looks good to me. I cannot find a diagram for oil flow or the control valves system.
Thanks again
 

Update
I read the manual, but I guess I'm just not understanding what I am reading.
The good news is we got it off and completely disassembled. The only thing I know for sure is that I had an 1/8" rollpin that had broken. I got a rollpin from Lowes and replaced it. The rollpin on the control lever that holds an L bracket in place that the return spring connects to was gone. It was not pulling the control lever back into place. And the equalizer arm is beat up on the end. Not bad but beat up a bit. I am now waiting on the gasket and will put it back together and on to the tractor and see what I ve got.
Thank you for helping and I ll update you when I get back. I will be speaking in Florida next week so I will be gone for about ten days.
God Bless David
 


Good afternoon buickanddeere
I received my gaskets on Tuesday and put everything together today. Unfortunately nothing has changed and the lift still does not work. All I know for sure is that the pump will produce over 1300 PSI and that all controls look good to me and are now connected.

Not sure what I am doing so I guess the next step is to replace the unit. Totally bummed!

Any suggestion on who may have one.

Thank you
David
 

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