3-point leaking down: Chinese Tractors -- Jinma Farmpro Agracat  -- Chinese Tractors Discussion Forum and Review 3-point leaking down: Chinese Tractors -- Jinma Farmpro Agracat -- Chinese Tractors Discussion Forum

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Discussion Boards > Active Subjects > Messages as Posted > Chinese Tractors -- Jinma Farmpro Agracat Forum

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 07-01-2011, 16:15 Post: 179249
jnewport2



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 3-point leaking down

I am borrowing a Tractor King JM200 2WD. I was driving it home from my friend's house and just as I pulled in the driveway, the 3-point lost pressure and dropped my box grader to the ground. I raised it back up thinking my hip hit the lever and it leaked back down. It was leaking pretty quickly, about 30-45 seconds from top to bottom. There was a small amount of hydraulic fluid leaking from a little set screw on top of the 3-point casing on the right side. If you were sitting on the seat, it would be right under your right hip. THe oil appeared to be boiling from this set screw (I did not notice a leak from anywhere else - and this one seemed to small to cause this kind of pressure loss). It leaked about 1 or 2 tablespoons of fluid. Since it was boiling, I thought maybe I was low on fluid and it got hot/thin causing me to loose pressure. I let it sit overnight, topped off the hydraulic oil in the 3-point sump, and tried it again. It was still leaking down, but much slower. No fluid leaking out. I used it for about a 1/2 hour and lost the ability to hold up the 3-point up altogether. Now when I raise it up, it lowers almost as fast as it raises. I really don't know how a 3-point works or where to start. Sounds like maybe I've lost a seal or o-ring that is keeping the fluid from holding pressure - but I have no idea where to start or what to look for. I did remove that little set screw on top of the casing, cleaned it, added teflon tape, and replaced it....I knew it was a long shot - and it didn't work. I don't think that leak is the source of my loss of pressure - though I wonder if there is an o-ring inside that has failed and the fluid is making its way to that screw. I just don't know how to find, check, where to start removing....etc. I have been all over the internet looking for schematics of how a 3-point hitch works and can't find much on a Jinma or Tractor King. I don't have an owner's manual. Any help with what my problem is, where to start, and what to do would be much appreciated. Pictures/diagrams would be AWESOME!

One more thing - I found on this site a forum about the pressure control valve and thought "no...it couldn't be that simple" It wasn't. I messed with the needle valve and didn't get any favorable results.

ideas? Thank you for your time and consideration!






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 07-01-2011, 18:07 Post: 179250
greg_g



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 3-point leaking down

There are thumbscrews on the lift lever linkage. My guess is that either they were not set properly, or you forced your way past them when you lifted the boxblade for transport. If/when the rear lift is raised too high, the O-ring and wiper(s) on the lift cylinder are damaged. Permanently.

But to be fair, some folks have had the thumbscrews set correctly - then unknowingly or unwittingly hitting a bump in the road during transport, which in turn raised the implement above the safe lift height. Result is the same, permanent damage to the lift cylinder seals.

By permanent, I mean it will leak permanently unless/until said O-ring and wiper(s) are replaced (some or all of items 15/17/19 on the diagram below)

//greg//





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Chinese Tractors -- Jinma Farmpro Agracat: 3-point-leaking-down

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 07-01-2011, 22:58 Post: 179255
jnewport2



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 3-point leaking down

That makes total sense. I actually do remember misjudging a bump in the road and hit it pretty hard as I turned onto my road, I heard something - but figured it was just my box bouncing - so I would say this is my culprit! This was less than a minute before my box started dragging. Thank you! So a few questions:

1) Looking at this diagram (thank you for this btw), it looks like I would need to disassemble starting from the front plate. Would I just start with the front plate (14) and work my way in? Does that piston (or whatever you would call 16-19) just slide right out (or is it supposed to)? If so, this doesn't seem all that awful of a job. Is there any advantage to going through the back plate?

2) Where would I purchase the o-rings/rebuild kit and assuming I need to order online, what would I specifically ask for? Would it be as simple as "wipers and o-rings for the lift cylinder of a 3-point of a Tractor King JM200"? I get a little nervous without part numbers to verify with a parts person on the phone what I need - it is more my lack of official terminology. Know of anyplace that specializes in Tractor King parts?

3) Anything else I should know about the disassemble that I should plan for?

Thanks again for your help!






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 07-02-2011, 07:22 Post: 179256
greg_g



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I've personally never had the need to perform that particular repair. But those who've had reported exactly as you describe; going in through the front. #16 however is the sleeve, I'm not sure that would actually have to come out. The piston is #18. The O-ring on the piston is #15 (metric , the wiper is #19.

What happens when the lift arms are raised too high, is that the piston gets moved partially beyond the lip of the sleeve. That exposes the O-ring and wiper. When the arms are subsequently let back down, the piston is pulled fully back into the sleeve. The O-ring and wiper are damaged as they're forced backwards through the lip. That's why I thought perhaps it might be prudent to have O-ring #17 on hand for the job. That said, the dealer may advise it's not necessary for that kind of mob.

As far as a parts source - any dealer that sells Jinma or any re-badged version of Jinma (FarmPro, NorTrac, etc). But over the years there've been several different lift boxes installed on the 200 Series. Unfortunately, the over-extension problem was never addressed in any of them. Although there was mention of a stop bolt in at least one of them. Anyway. As a result, most dealers will carry what they call a "lift cylinder repair kit". But which kit you need depends upon which box is on your tractor. Some pistons had more than 1 wiper, which is why I used "wiper(s)" earlier. So be prepared to tell the dealer the model year and serial number of your tractor. That info should be on a metal label glued either to the inside of a rear fender or alongside the transmission housing.

//greg//






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 07-07-2011, 22:36 Post: 179315
jnewport2



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I can't thank you enough for your help. I found a parts dealer online out of TX. They were very friendly on the phone - a smaller operation - which allowed for some real personal service. I asked the parts lady if I could speak to one of their mechanics and he helped walk me through what I would need to do. Between his directions and your picture, I was able to understand what I needed. Below is my experience for future readers:

I ended up taking off the back plate and the front plate. I started with the back to see if I could get to the piston from the back....can't without removing piston rod (27)- but I also wanted to check if I had a stop bolt. The drain plug for the oil located on the back plate and by removing the plate I was able make certain I get all the oil out. I do have a stop bolt - but it was mashed from a few too many hard bumps. It's hard to explain, but basically, the rocker (number 40) that is connected to the piston rod (27? - hard to read) is the part that hits the stop bolt. The connecting point almost straddles the bolt to where the actual contact point is on the outer 1/8" of both sides of the bolt....a few hard jolts and the stop bolt gets mashed out on the edge...allowing for an extra 1/8" of travel for the piston. Which I can attest - is too much.

Moving to the front, I had to remove the top of the gear box (where the shifter is located) in order to remove the front plate. I removed the front plate - it is kind of snug due to the o-ring (The first #15). I ended up using the oil left in the cylinder and pushed down on the 3-point (#30? - hard to read) to help push out the cylinder. It got it most of the way, but still had to work it out by hand a bit. All the oil made a mess....but had to get that oil out anyway. Having the rear plate off turned out to be necessary as I was able to push the piston out of the cylinder(16)with a piece of 1x1 wood. The cylinder is pressed in. Once out the o-ring (15)and neoprene rings (19) were easily replaced.(they were my culprit)

From there I just put it all back together.

The whole thing took less than 3 hours - and that was with my 4-year old "helping".

Pretty painless all-in-all....but next time I need to get the tractor.....I will use the trailer!!!






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 07-07-2011, 23:33 Post: 179317
greg_g



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Great description. Too bad your initiation into the world of Chinese tractors had to be by way of fixing one !! But that's actually one of their attractions; that is, they're basic fix-in-the-field machines.

//greg//






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 07-07-2011, 23:58 Post: 179318
jnewport2



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 3-point leaking down

You are exactly right. "fix-in-the-field" is what I did and was easy to do. Or at least "fix-in-the-gravel-driveway." Plus the tools necessary are common amateur tinker-er tools.






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 08-23-2011, 16:22 Post: 180005
johna1



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 3-point leaking down

quote
(Moving to the front, I had to remove the top of the gear box (where the shifter is located.)
was there much involved in removing the top of the gear box.Thats where i have to go.
john






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 08-24-2011, 10:12 Post: 180020
greg_g



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Not at all. Just remove the hex head bolts and lift straight up. But be prepared to cut a new gasket. They usually tear when you lift the cover. And when you get to replacing the cover, just remember to align the lever(s) so that the finger at the bottom fits into the associated sliding fork before you bolt it back down.

//greg//






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 08-24-2011, 16:30 Post: 180031
johna1



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Thanks for that greg_g.
Buti have found that something elce is wrong with it as i have got the lift working by turning the steering,so the lift must be ok.took it out yesterday and completly lost my steering.This thing is a nightmare.






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Discussion Boards > Active Subjects > Messages as Posted > Chinese Tractors -- Jinma Farmpro Agracat Forum

Thread 179249 Filter by Poster:
greg_g 9 | jnewport2 5 | johna1 8 |




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