B6200 Hydraulic woes - 3pt won't lift

[ChrisB6000]

Hi all my unknown problem became a big problem.
First off my 3pt hitch stopped lifting, slowly to start and then nothing. Damn.
A quick search led me to check my suction filter. It was ok not plugged, but on the replacement, The banjo fitting was putting sideways pressure on the alignment and stripped the first couple of threads.
First question, is it possible to get a replacement bolt that holds in the filter?

Second question, what should be my next course of action to diagnose 3 pt hitch not lifting....

Thank you,

Chris

 

[Dave_eng]

You don't state which model of B6200 you have. HST, 2WD or 4WD

Does your suction screen look like this one?

I would check carefully on the suction side of the hydraulic pump all the way back to the suction screen. Air leaking into the system will greatly affect the performance

If your suction screen/filter does not look like this one I suggest you post a photo.

Dave.

 

[ChrisB6000]

You don't state which model of B6200 you have. HST, 2WD or 4WD

Does your suction screen look like this one?

I would check carefully on the suction side of the hydraulic pump all the way back to the suction screen. Air leaking into the system will greatly affect the performance

If your suction screen/filter does not look like this one I suggest you post a photo.

Dave.



View attachment 46151

HI Dave, it is a 4WD. Yes the screen looks like that! I was able to source a tap of the right size and some thread files to clean up the filter threads. with the banjo fitting pulled out of the way i can thread the filter back in, yes, I figured I was there, but when trying to re-install with the banjo fitting in place and the stiff hard line attached to it, I have a hell of a time getting it started to thread. I took the tire off last night so I could have a straight shot at it. Got frustrated, so I left it till tonight so I didn't really screw it up.
If I need a new one, did you happen to have the part number?

I will check the the suction line for leaks etc. Really want to get filter back together so I can do more trouble shooting.

Thank you,
Chris

 

[Dave_eng]

HI Dave, it is a 4WD. Yes the screen looks like that! I was able to source a tap of the right size and some thread files to clean up the filter threads. with the banjo fitting pulled out of the way i can thread the filter back in, yes, I figured I was there, but when trying to re-install with the banjo fitting in place and the stiff hard line attached to it, I have a hell of a time getting it started to thread. I took the tire off last night so I could have a straight shot at it. Got frustrated, so I left it till tonight so I didn't really screw it up.
If I need a new one, did you happen to have the part number?

I will check the the suction line for leaks etc. Really want to get filter back together so I can do more trouble shooting.

Thank you,
Chris

Chris

Oil Filter (screen) - 66021-36390 $13.07

Dave

 

[ChrisB6000]

Ok, so update. I got the filter back in nicely.
Maybe will help others down the road, for sure remove the rear right tire to get a straight access to reinstall filter bolt,, and also loosen clamp(s) toward engine compartment on the suction hydraulic line, this will give you better ability to align holes and keep filter bolt from cross threading.

OK so now 3pt lift still not work and more confused than ever.
Removed lift cylinder head and pulled cylinder. Oring and white seal looked in great shape. Started tractor briefly and made sure hyd oil shot out of hole that would feed the top of the cylinder.
I have still hydraulics to my FEL, so I know its not the pump. I made sure the front diverter valve wasn't turned, and also played with adjuster knob under seat but as far as I understand that only controls drop rate.

If i lift the arms manually, while the lever is in the lift position they will stay in place and hold enough pressure that I can stand on them. If I drop them with the lever they respond nicely. But on lift just no snuff.

I am very confused and don;t know what to try next. Any help is appreciated.

Chris

 

[Pau7220]

Easiest place to start is disconnecting and reconnecting all of the quick disconnects on the loader. It happened to me when a stick partially disconnected one.

 

[ChrisB6000]

Easiest place to start is disconnecting and reconnecting all of the quick disconnects on the loader. It happened to me when a stick partially disconnected one.

Thanks Paul , but the loader is working flawless it’s the 3pthitch that has no lift

 

[Pau7220]

Thanks Paul , but the loader is working flawless it’s the 3pthitch that has no lift

Mine did too... just slowed a little. But I had to drag the brush hog all the way back to the barn until I figured it out.

 

[kkk]

So what did you figure out at the barn?

To the OP......Just went through this whole nightmare..stripped threads ....all the rest.
What oil did you put back in?
Did you change "O" rings on both sides of Banjo fitting?

 

[Pau7220]

So what did you figure out at the barn?

It happened to me when a stick partially disconnected one (edit) of the quick disconnects

 

[ChrisB6000]

K, I used TDH oil and never replaced the orings, they were in good shape and held fine.

I have now traced the problem down to the controls that the lever adjusts for up and down.
I can confirm the main lift cylinder is holding well and getting good flow.
I opened the box where the raise/lower lever connects to . Inside is an H bracket that toggles up or down as you pull lever (raise or lower). I started tractor briefly to ensure hyraulic flow here, and when I put plugged one of the ports the best I could with my finger the lift arms raised up quickly, all good.
Needless to say Hydraulic fluid sprayed everywhere, but it was worth it to start to narrow down the issue.

Best I can guess the issue is on that H bracket and the little piston it connects to which I assume controls the flow to the top and bottom of the main lift cylinder.

Does anyone have a blow of this assembly? Is there any common things to check within this unit.
It is so odd that it worked fine, and then got a bit touchy and then quit all together in a short period of time.

Thank you,
Chris

 

[ChrisB6000]

Thinking about this more, it must be a stuck relief valve in the 3pt hitch, does such a valve exist, and is so where do I find it?

Thank you,

Chris

 

[kkk]

I first tried some "thin" oil...Hyguard.
3 point didn't like it ...was jerky and inconsistant.
Then noticed the leak.......Tractor had been split previous to me by looking at all the parts underlined in the Parts Manual...Suction line being one of them. I'm assuming they stretched it as it was a PITA to get the screen back in. After dumping fluid ...removeing screen..assesing previous damage to the threads.....Fairly severe and I didn't do it..no thread chunks present and all fluid was rescreened and set aside to flush out another hydro project. Had to build a bunch of wedges to hold the line in place( forwards) then lots of special words and tools....finally got it to bite on what must have been the last remaining thread.....
Installed New ,not kubota Fat "o" rings on each side of banjo(suction line).
Figured to go fat cause finding the original threads and getting the bolt back in square was gonna be a gamble. Factory "o"rings are super small diameter.
Refilled with 80 wt. like my book says...nice and smooth now...no more relief valve noise.
Mine has a factory loader but runs off a crank mounted pump.....Seperate system.
My 3 point linkage was all twisted up but straightened easily once removed.
While mine is a 77 " B7100D...I think they are similar.
Your "H" valve ( or whatever its real nmname is ) sounds like may indeed be the issue....Yours just has one pump for all hydraulics correct? Sounded like the loader does not have its own pump like mine.