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Ford 3000 hydraulic question

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Mathias NY

02-23-2008 14:12:19




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The 3pt hitch on my 3000 will only lift about 200 lbs, 400 lbs if I rev the engine. The fluid was milky, so I changed it, no change in performance. Once the lift is raised, it will hold the weight overnight, so I don't think it is a rockshaft problem.

Does this sound like a problem with the pump or the relief valve?

Thanks for the help.




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steve n carol

02-27-2008 06:35:45




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 Re: Ford 3000 hydraulic question in reply to RickB, 02-23-2008 14:12:19  
BRAVO!
reminds me of a joke about the doctor that went to mechanic's school.

Bored with the day job of being a Dr. Our man decides it might be time to make a change. Wanting to learn and accomplish somthing he has never done before, he attends night classes for the semister at the local college to study and learn 'how to be a mechanic". Very well, after 6 intensive weeks of study and 'hands on' instruction, the instructor gives his final to the class.
The instructor announces to the class, "The final for the class, is to perform an overhaul on this import 4 cyl internal combustion engine. I have engines for each person. You will have one week to accomplish this."

Aweek later.... On the following Monday the instructor has posted the test results on the board....Upon coming into the classroom , the Dr. sees the crowd gathered around the board, many are just astounded! There at the top of the list is the Dr's. good name! Seems he scored the highest possable score, 100%!!!

Some are not so astounded! Seems that a few with previous mechanical experience are complaining that their scores are in the middle of the results.
Upon lodging their complaints to the instructor during the beginning of the class, the instructor explains why he gave the Good Dr. such high marks. With a smile on his face, he addresses the class. "Good evening class. I see that all of you have seen your test scores, and I noted that some of you are a bit disgrunted w/the results. I should add that all of you passed the final, and that is commendable, congratulations! Some of you feel that you deserve a higher score due to your experience. Again, all of you did a fine job. However, the higest score fittingly goes the good Dr. Who did somthing I have never seen! Not only was his overhaul a success, but his engine overhaul work was performed completely through the tailpipe!

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Mathias NY

02-26-2008 17:56:06




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 Re: Ford 3000 hydraulic question in reply to Mathias NY, 02-23-2008 14:12:19  
third party image

Update:

Well I couldn't find the right adapter to join the pressure gauge to the remote cylinder port, so I didn't get a reading.

I decided that the filters should probably be cleaned or changed, and I should probably check the health of both pressure relief valves. So I yanked the top cover off and drained the fluid again. I also removed the access panel on the clutch side, along with the foot board (for easier access). The mesh filter was still inaccessable, so I removed the PTO shaft. With a little bit of persistance, and bending the mounting tab for the filter, it came out. If the picture attaches you should be able to see just how dirty it was. I can see where at some point someone has been through the same steps and used a black rubber gasket material on the reinstall. With a dental pick and a can of carb cleaner I removed a bunch of that rubber from the pleats in the filter.

I am going to clean the check valves, but suspect that the problem I had is related to the plugged intake filter.

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steve n carol

02-26-2008 06:58:19




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 Re: Ford 3000 hydraulic question in reply to RodInNS, 02-23-2008 14:12:19  
Pressure gage! The best idea! let us know what you got.

as far as removing the filters from the top.... I was able to remove and replace the return one. I don't remember being able to see it, or not, (it's a memory thing). I was able to remove it, but with reconfiguring some of the center section sheetmetal (internal). Was not able to see the screen filter in the sump, I could feel it though! Does that count? I truly would have tried to remove it if I thought I could!
I did a websearch on the lift cover before I tok it apart. found some interesting stuff form the University of Mo.
have fun...sl

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Texasmark

02-25-2008 06:50:14




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 Re: Ford 3000 hydraulic question in reply to Mathias NY, 02-23-2008 14:12:19  
Could be a lot of things. Milky fluid means water and there are a lot of cast iron parts in that system.

The fact that it holds once up says a lot about the rockshaft piston ring (rubber oring) and cylinder condition.

If you got all your bubbles out of the fluid it says the fluid is being pumped.

What you probably have is a dirty filter, down in the sump.....unless you have a late model with an external spinon filter. There may be (usually are) two, coarse mesh on the oil input and regular filter on the outlet. I guess they did it this way to reduce the opportunity for the pump to cavitate if the fine mesh filter were on the inlet side and got clogged up.

Dirty filters do that..... work at low rpm's but can't pass the required fluid volume at higher rpm's.

Mark

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Mathias NY

02-25-2008 08:03:27




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 Re: Ford 3000 hydraulic question in reply to Texasmark, 02-25-2008 06:50:14  
That would make sense. I wouldn't be shocked if both filters were plugged. There was some crud on the drain plug when I pulled it. It is a '66 model, so they are internal. Without actually looking at it, it looks like they should both be changable from the top.

I opted to wait on pulling the top cover off the transmission yesterday. Today I am borrowing a pressure gauge from work to plug into the remote port. This should tell me if I have a system-wide problem or a just a problem with the lift.

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steve n carol

02-24-2008 08:11:32




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 Re: Ford 3000 hydraulic question in reply to Larry NCKS, 02-23-2008 14:12:19  

Mathias NY said: (quoted from post at 15:12:19 02/23/08) The 3pt hitch on my 3000 will only lift about 200 lbs, 400 lbs if I rev the engine. The fluid was milky, so I changed it, no change in performance. Once the lift is raised, it will hold the weight overnight, so I don't think it is a rockshaft problem.
Does this sound like a problem with the pump or the relief valve?
Thanks for the help.


Mathias, I am going to go "out on a limb" here. Perhaps to save you some labor, (at this point). I know just enough about this topic to be dangerious. (that was my disclaimer).

Without having to remove the lift cover, you can access a valve from the outside. I believe this is the relief valve. This valve is located in the lift cover. At the front. In front of the seat. Below any Hyd remote valves, (if equiped). If I recall correctly, it looks like a hex bolt head.
You can remove this valve with ease, unless it is stuck. Look on your parts CD and print out the diagram take the diagram into the front room(where you are working on the tractor, I assume), and take this relief valve apart.
ON MINE.... The valve check ball was hammered and so was the seat. As well as being put back together incorrectly.
Since these are very, I mean VERY, expensive to replace w/new, I reassembled mine and use it like it is, Which is marginal (now). Which is MUCH better than it was.
I also suspect that the intake screen (on mine) needs to be cleaned. I was going to replace this.....HA! PER THE PARTS MAN AT FORD.....$$537.00 FOR A %$#^*&%# FILTER! However, the steel tube came with it :D
The parts man also told me that this filter is a 'screen' and can be cleaned! :D
Since I could not remove this filter from the top, and don't want to split my tractor at this time. So, I will drain out the fluid (again) and backflush the intake line w/the drain plug removed. This is my plan anyway...

Please let us know how you fare w/ this...sl

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Mathias NY

02-24-2008 12:01:27




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 Re: Ford 3000 hydraulic question in reply to steve n carol, 02-24-2008 08:11:32  
I hadn't bled the pump (I figured after a few hours of operation any air would have worked out). This afternoon I did bleed it, a few air bubbles came out, now the lift will barely raise at all. I'm not sure what that means. It also works better when engine is idling, this is backwards from what it did yesterday.

I tried to remove the relief valve, not enough clearance to get a wrench on it. Sounds like the next step is to pull the lift cover. This will let me get a look at the filters and the relief valves.

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rgvtx

02-23-2008 19:48:10




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 Re: Ford 3000 hydraulic question in reply to Mathias NY, 02-23-2008 14:12:19  
Did you bleed the hydraulics after you changed the oil???
Your symptoms sound somewhat similar to a stuck unloader valve, but since it stays up overnight I'm not so sure. I wouldn't think the pump was your problem. Below is a link to when I had issues with my unloader valve. Mine would do nothing at all, not exactly the same as your problem. But it almost sounds like yours may be stuck or partially stuck in between. Just takes the time to remove the lift cover and start investigating to be sure. But of course, first thing is to verify you did indeed bleed the system after the oil change.

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