Help needed - leaking hydraulics issue

[ejtaylor822]

Hey Chip.
Here is the view from the back. It's not a direct shot of the back but you can see the housing. The housing/clip, where the top link attaches, spans both the sump case and the axle housing.

It was mentioned that this was the mechanism for the draft control. I didn't think I had draft control, if I do, I don't know how to use /forums/images/graemlins/confused.gif Some one please correct me if this is in fact for the draft control. I am a novice.....

My thought was this is where a leak could be occurring - draining into the axle housing if this piece has a cavity.

 

[ejtaylor822]

Another view from the back looking forward - back of the lever and valve assy. Not looking forward to removing these hoses.

 

[ejtaylor822]

View from the front looking down the side towards the valve assy.

Chip,
Was thinking I could remove the front cover here and look at the piston. Was not sure though if I saw the O-ring trashed how I would get the piston out. Will start with taking the front cover off and go from there.

 

[ejtaylor822]

View 1 of the sump case parts diagram.

Notice the plate, part # 29. Appears in the diagram it is only 3/4's the length of the case. If the plate is totally internal and there is a chamber in the back, I can see where this could leak into the tranny.

Will be sure to take plenty of pics and document if I end up pulling the housing off. I am just curious how all of this works inside.

 

[ejtaylor822]

View 2 of the assembly.

 

[ejtaylor822]

Diagram of the lever and valve assembly.

 

[bluechip]

OK, not like anything I have worked on. There is some type of draft control as evidenced by the linkages attached to the yoke the top link attaches to but not sure how it works with only one lever, maybe like on Fords, Soundguy where are you? Anyway, I don't think that you will see much if you take off the front cap. but won't hurt to try. I think your bottom plate is cracked, or maybe just loose allowing oil to seep into trans. I know this is not necessarily good news, but let me know what you see when you take the head off the piston.

 

[GuglioLS]

</font><font color="blue" class="small">( ( ............. There is some type of draft control as evidenced by the linkages attached to the yoke the top link attaches to but not sure how it works with only one lever, maybe like on Fords.......................... ))</font>

EJtaylor & Chip,
FWIW - I will comment on the draft control.
I still have my old Ford (NAA) as well as my new Jinma354.
The NAA Ford has one lever Lift & Draft control - the draft works by moving a draft on/off lever. When draft is off the single lift/draft lever controls lift. When the draft is on the lift/draft lever controls the draft pressure instead of lift.

After looking at the photos posted carefully - I seems to have a draft option. As always I could be wrong. Maybe include the parts description that goes with the pictures? I wonder if there is some valve or lever somewhere that activates the draft ?

When you gather the courage to remove the TPH box - Don't be worried about removing those hose connectons - you will do fine.

 

[Soundguy]

Bluechip.. I looked at the diagram that shows the lift top cover.. very much looks like a late 60's / 70's draft setup

And Gug.. I'm not sure what diagram you looked at.. but... this one diagram Clearly shows the toplink rocker as aprt number 44.. it pivots on pin 78, in the housing 77 parts between 48 and 54 are part of the draft cushioning.. notice the large spring.. etc.

His picture of the rear does not show all of pivot plate #77.. but I suspect the hole plate 77/44 assembly can pivot, as there is a nut behind the plate that I believe is visible in
the pic.. so it may not be solidily affixed to the lift housing.. etc.

Without better pics of the rear showing all of 77 and 44.. hard to make the 100% determination.. but at least for now.. I would say the aprts are in place for a draft system.. whether it is fully implemented or somehow 'locked out'... etc..

Soundguy

 

[GuglioLS]

Attached above is a doctored up one of your photos.
It MIGHT explain how draft works or not.

Item 44 must be able to pivot in order for the draft feedback to work. Looks like the top two bolts may have someting to do with it. The bottom ones look like they must be tight at all times because it holds item 77 to the TPH box. Perhaps check your Chinenglish operators manual?

Soundguy - check it out. If those top two bolts are tite, then item 44 cannot pivot. I am thinking they need to be loosened inorder for draft to work. What do you think ?

If they are ever so slightly loose, draft might be working - causing slow drift down of his BB.

 

[ejtaylor822]

Chip, Larry and Chris/Soundguy,
WOW! Nice to have three people as knowledgeable as you guys looking at this. More pics attached.

Larry,
Did not check if the bolts were tight - using my hand, they are very tight.

I am so anxious and wanting to dive into this thing. My curiosity is really getting the better of me and really want to get inside of this thing. Will definitely get some pics. Figure if I mess it up or can't get it back together, it still runs, will just load up and take up the road here to a heavy equipment mechanic.

Would be tearing into today, but, the lovely wife got me a flyfishing class/guide for the day for Valentine's day. So, I get to suffer through a day of fishing /forums/images/graemlins/grin.gif /forums/images/graemlins/grin.gif /forums/images/graemlins/grin.gif

Hope to get into this tomorrow.

Anyway, here are the pics beginning with the left side.

 

[ejtaylor822]

Front view looking straight on - may not be of much value with the top link in the way.

 

[ejtaylor822]

And finally, the right side (looking from back to front on the tractor). I removed the down link to show the rod going to the arm.

You know, the "chenglish" (like that one Larry) manual is not all that good. I remember reading about draft control, but I did not think I had it. Seems like the dealer may have told me that. Need to get the manual back out and take a look.

Now that I look at this, that arm going from this assembly to the linkage on the lifter is there for a reason I would think. I have always been curios why the rubber boot is there at the top of this assy. Looks like to me its there to provide protection and be flexible, especially if this thing is suppose to flex/pivot. Very interesting......

My apologies for my tractor being so dirty - its a disgrace I know but its like I use to say about my old truck - a dirty truck is a happy truck. Picked me up a new Craftsman 3000 PSI pressure washer Thursday night. Going to give the tractor a good hosing off before I get into this (not at full pressure though /forums/images/graemlins/cool.gif ).

 

[Soundguy]

</font><font color="blue" class="small">( Soundguy - check it out. If those top two bolts are tite, then item 44 cannot pivot. I am thinking they need to be loosened inorder for draft to work. What do you think ?
)</font>

Either the bolts need to have some play.. or they fit in a blind recess behind the plate, or just plain fit behind it. Diagram shows nuts.. assuming you don't have to take the top cover off to get to those nuts.. I'd say the nuts go behind the plate.. 77 Hard to tell from his pics.. we need a profile shot as well as a lower shot showing all of the pivot pices and anchor piece. But yes.. I do think it is aprt of a feedback setup.. whether it is fully implemented, or locked out.. hard to say without those pics.

Soundguy

 

[Soundguy]

</font><font color="blue" class="small">( Chip, Larry and Chris/Soundguy,
WOW! Nice to have three people as knowledgeable as you guys looking at this. More pics attached.
)</font>

Ok..this pic is telltale guys.. take a close look at this one.. expand it on your screen if using ie6. Part 44 pivots on part 77 via pin 78. Now.. part 77 appears to be bolted securely to the lift housing. However, there appears to be relief room behind 44 for the bolt/nut.. perhas this bolt and nut is a 'stop' limiting max pivot?? hard to say.. but look at that pic right where the bolt is on 44.. not look where the nut would be.. you see a relief int he metal that leads me to believe that part 44 is free floating to pivot on 77.. also.. there appears to be a rubber gasket/oring to keep water out. I'd guess it is fully functioning feedback, assuming you have a draft control somewhere, unless the stop bolts can be adjusted to 'turn it off.. etc.. by taking all the pivot room out.. etc.. That's my unprofesional opinion anyway....

Soundguy

 

[Soundguy]

</font><font color="blue" class="small">( Now that I look at this, that arm going from this assembly to the linkage on the lifter is there for a reason I would think. )</font>

Yep.. this is deffinately feedback linkage..

Soundguy

 

[GuglioLS]

Ok there is some sort of lever here what does it do?
Maybe this is what is moved (by hand) to allow the yolk to pivot?

 

[GuglioLS]

And some sort of other gizmo ?

 

[GuglioLS]

</font><font color="blue" class="small">( .............

My apologies for my tractor being so dirty - its a disgrace I know but its like I use to say about my old..........................)</font>

You could damage your tractor by cleaning it. /forums/images/graemlins/shocked.gif
The only parts on a tractor that should be clean (for only a short time) are those parts that have been recently repaired or replaced.

 

[Soundguy]

</font><font color="blue" class="small">( And some sort of other gizmo )</font>

Looks to perhaps be a blank or plate under the bracket and pivot.

That other linkage bar you outlined in you last post deffinately looks like some kind of mechanical feedback linkage. if you will notice, one end is hooked to the lift arm, and will 'cam' arouns as the lift arm lifts... thus pushing that linkafe back.. ohter end of the linkage is on the pivoting toplink rocker.. deffinately looks like it is a feedback linkage.. could be a real crude position control gauge.. or could be for draft. I'd really have to see the parts breakdown and have one in my hand to make a further exact diagnosis.. but I'm deffinately seeing feedback linkages.. not sure how their valving works , or if it is a constant draft / or conventional position controll.. or an inching design..

Soundguy