Hydraulic issues with my Jinma: Chinese Tractors -- Jinma Farmpro Agracat  -- Chinese Tractors Discussion Forum and Review Hydraulic issues with my Jinma: Chinese Tractors -- Jinma Farmpro Agracat -- Chinese Tractors Discussion Forum

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 04-22-2009, 13:52 Post: 162234
bezanson



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 Hydraulic issues with my Jinma

Was mowing my property yesterday with my tractor, Jinma series 200 (one of the smaller ones). All of a sudden my power steering went out, as well as my ability to lift my loader or the rear mower deck. Basically, no hydraulics working.

I took the seat off and took off the 3 bolts so I could pull out the screen and take a look at the hydraulic fluid. Everything looked good. Screen was a little dirty. CLeaned it up and put it back in.

THen I removed the pump and took it apart to look for problems. All gaskets OK, pump turned fine and looked clean. I put it back on, primed it by blowing compressed air in the reservoir, but left the outgoing connection off of the pump. Turned the tractor on briefly and fluid came pouring out. So I guess the pump is OK.

I put it back together and it is still not working! I am new at this. Is there a filter somewhere, or is that screen it. What else can I look for!? Lost?

Thanks,
Jim






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 04-22-2009, 14:09 Post: 162235
Murf

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 Hydraulic issues with my Jinma

Sounds like you may have a problem with the pressure relief valve.

If it goes bad, something as simple as a broken spring will do it, the fluid just gets dumped out of the pump straight back into the reservoir.

You need to put a gauge, one with a maximum of 3,000psi rating, on the system and see what if any pressure you're getting.

Best of luck.






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 04-22-2009, 14:46 Post: 162236
greg_g

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 Hydraulic issues with my Jinma

For some reason, Jinma never saw fit to employ pressure relief in the 200 Series. In most cases, pressure relief consists of the gasket between the pump and the pump drive. Check your dipstick, see if your engine oil level is higher than it should be. If yes, the pump seal is gone.

The reason it "looks" like it's pumping, is that there's no load with the output hose disconnected. Hook that back up, and the hydraulic fluid will end up in your engine oil pan. Not a big job replacing the seal, just messy - and costs you an engine oil/filter change to boot.

//greg//






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 04-22-2009, 20:47 Post: 162240
bezanson



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 Hydraulic issues with my Jinma

, I guess I will stop looking for the pressure relief valves Smile
OK, will give that a look. Thanks.






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 04-22-2009, 20:53 Post: 162241
bezanson



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 Hydraulic issues with my Jinma

Engine oil looks good and is at correct level.
The first thing that the pump goes to is a box underneath the steering wheel. Could there be something wrong there?
I am at a loss at this point.
Not sure what good troubleshooting things I can try.






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 04-22-2009, 20:54 Post: 162242
bezanson



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 Hydraulic issues with my Jinma

When I first looked at the reservoir, by the way, it looked a little low. Could some air have gotten in the system that I need to flush out somewhere? Just guessing.






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 04-22-2009, 23:36 Post: 162249
greg_g

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 Hydraulic issues with my Jinma

Quote:
Originally Posted by bezanson | view 162241
The first thing that the pump goes to is a box underneath the steering wheel.

That's not a pump, it's the steering controller. It responds to your steering wheel input by sending hydraulic fluid down the correct hose. Besides, the steering controller - good or bad - has no effect on the rear lift operation. Actually the first thing after the pump is a QD connector. They've been known to pop apart. Some are ball-type, some are cone. The cone type have been known to plug up. But a problem here would bog the engine down. The next thing inline is the priority valve.It's alongside the right rear of the engine - after the QD connect, but before the steering controller. But when they get dirty, it's an either/or situation; either the steering doesn't work, or the lift doesn't work.

Yours is a vented system - which by design is self-priming. And if air got into the system, at a minimum you'd see bubbles when the tractor is running. Steering and lift would get jerky before it actually quit due to lack of fluid. A bad enough air leak can foam fluid right out the vent and down the back of the tractor. Low fluid will make for jerky lift operation and intermittent hard steering. But if you can still SEE it - you're not that low. My hydraulic dipsticks have only one line on them, I consider that the full mark. I never top up the hydraulic fluid until the dipstick comes out dry.

What you describe usually turns out to be either a plugged up (or collapsed) suction strainer - or a bad pump.

I don't recall you mentioning a loader. If so equipped, is that not working either?

//greg//






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 04-23-2009, 00:20 Post: 162251
bezanson



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 Hydraulic issues with my Jinma

I do have a loader, and it also was not working.
I have since bypassed it to get it out of the picture.
I took the pump apart. It seemed in good working order, and all gaskets and seals looked good also, although not sure what I would be looking for.

I cleaned the strainer, but it seemed OK.

The quick disconnects are the ball type. I can press in on the ball, which seems to be spring loaded. So I guess that is in working order to.

I will get at it again tomorrow. I probably need to figure out a better way to determine if the pump is working correctly under pressure. I don't have a pressure gauge.

Thanks to Greg and Murf for your help on this so far.






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 04-23-2009, 05:35 Post: 162254
greg_g

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 Hydraulic issues with my Jinma

Taking the loader out of the equation was a good move. Unfortunately you can't do that with the steering or rear lift, because they're part of the same loop. The priority valve acts like a part-time Y-connector. When fluid is not needed for steering, the loop is strictly sump>pump>lift>sump. When it detects feedback from the steering controller, the priority valve permits the steering portion into the loop. At that point it's more like a figure 8; lift part of the loop still works, but the added steering part is priority valve>steering controller>steering cylinder>controller>priority valve. So you see that a plugged priority valve SHOULD leave you with either steering OR rear lift. But since it's relatively simple to remove-clean-replace, that's better that scratching our collective heads.

Besides, temporarily removing the P-valve will also permit you to confirm that fluid is in fact passing through the QD. But like I said, your symptoms really are more consistent with a plugged suction screen or a bad pump.

//greg//






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 04-23-2009, 09:14 Post: 162257
auerbach



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 Hydraulic issues with my Jinma

Sounds like you got the answers you need, but if not, there's a site called Chinese Tractor Owners Association.






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

Thread 162234 Filter by Poster:
auerbach 1 | bezanson 7 | chipuren 1 | greg_g 4 | kalpia 2 | Murf 1 |




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