3 point hydraulic lift issues - 2610d

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LZeppelin513
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3 point hydraulic lift issues - 2610d

Postby LZeppelin513 » Sun Jun 28, 2020 5:05 pm

My 3 point lift bleeds down fast when tractor is off. Much less when stop valve is closed, but still does. Also, control valve leaks fluid from pushrod seal. Been this way for a while but the leak has gotten pretty bad. I took off the lift housing to examine.

I noticed some strange issues with the valve hardware inside the front cylinder cover.

First, part 14 is sheered in half. But I don't think this is causing my leak and bleed down. But obviously not good.

Second, part 6 in what I believe is a pressure relief valve is non existant. On mine, the steel ball, part 12, is what makes direct contact with the port in the housing, nothing after it. Could there have been multiple designs and this is ok? If not, I'm thinking if this isn't sealing properly it could be causing my lift to bleed down...

What I was expecting to find was a bad o ring on the 3 point piston but it all looked great. I'll be replacing that anyway.

Thanks,
Blake
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LZeppelin513
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Re: 3 point hydraulic lift issues - 2610d

Postby LZeppelin513 » Sun Jun 28, 2020 6:04 pm

Here is mine. Concerni g the pressure relief valve; the second picture shows inside the housing where the steel ball is pressed tight by the spring. It's hard to tell from the photo but the surface has a chamfer so perhaps this is how it was set up from the factory.
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LZeppelin513
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Re: 3 point hydraulic lift issues - 2610d

Postby LZeppelin513 » Sun Jun 28, 2020 9:33 pm

Also, I could definitely be interpreting the diagram wrong, so please correct me if you know better.

I'll explain what I think I'm looking at. Part 2 is a bushing that is threaded into the housing, which you can see in my second picture. And part 6 is what I am missing because it should have came out after the steel ball, which you can see in the first picture.

winston
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Re: 3 point hydraulic lift issues - 2610d

Postby winston » Mon Jun 29, 2020 4:38 am

Part 2 shown in your second picture should screw out and part 6 and 13 should be behind it.

LZeppelin513
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Re: 3 point hydraulic lift issues - 2610d

Postby LZeppelin513 » Mon Jun 29, 2020 9:53 am

OK, Thanks WInston, that answers that.

So, in other words, my pressure relief valve is normal.

winston
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Re: 3 point hydraulic lift issues - 2610d

Postby winston » Mon Jun 29, 2020 10:35 am

I believe parts 7 thru 10 are shims and the amount is what changes the relief pressure. Does the seat and ball look good, both surfaces good and smooth. Is #2 good and tight?

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Re: 3 point hydraulic lift issues - 2610d

Postby LZeppelin513 » Mon Jun 29, 2020 11:07 am

I agree, I figured the same for parts 7-10. The seat and ball do look good and part 2 is tight.

I was mixed up about part 6. I was expecting it to float behind the ball inside part 2. But like you said, I now can see it secured tight behind part 2 and the ball seats inside of it.

Im hoping replacing all the o-rings does it for me. The main 3 point piston o-ring looks and seems to seal just fine but hopefully its the culprit...

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Re: 3 point hydraulic lift issues - 2610d

Postby LZeppelin513 » Tue Jul 07, 2020 3:02 pm

Replaced all the O-rings and put it all back together. Still the problem persisted, no change. The hydraulic valve was replaced with a brand new unit a couple years ago when my I was trying to sort the three point problems from the start. Because it was brand new I never suspected it to be the culprit but in desperation I ordered a known good used valve. Replaced valve and all problems solved. Very happy.


To sum it up:
Bought the tractor in 2018 with some 3 point lift issues. The three point lift was not properly responsive with the lift handle acting in a somewhat "all or nothing" manner. Also, the lift would lower in a matter of seconds when weighted and the engine shut off.

I figured the control valve was bad because the lift would (mostly) hold weight and engine off with under seat stop valve closed.

Replaced the valve with a brand new unit and no noticeable change.

Since the new valve did nothing and because the lift would still VERY slowly lower when engine off, weighted, with stop valve closed, I figured that I must have been wrong about the valve and actually needed to rebuild the lift cylinder. Needing to use the tractor I decided to put off that task for another day.

Over time the valve began to develop a leak from the push rod. When the leak got too bad to ignore I decided to rebuild the cylinder (this post). This resulted in maybe a slight change but still leaked and also would not hold when engine off.

Replaced the valve with a known good used valve and finally the lift holds when off, doesn't leak, and functions properly. Happy.

winston
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Re: 3 point hydraulic lift issues - 2610d

Postby winston » Tue Jul 07, 2020 5:37 pm

Glad your up and going. Sounds like some bad luck getting bad parts.


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