1700 ford with hydraulics issue

[mike48130]

That is technically a suction screen. You just need to clean it out with brake cleaner or such and not replace them. But if you cleaned it or replaced it, it should be good.

The valve in the center under the seat is just the 3 point lowering valve. You adjust it to set the speed you want the 3 point attachments to lower so they don't go crashing to the ground. Should not affect this if you 3 point is moving up and down.

Before you tear into too much more, I would make sure none of the steel lines are damaged. It is possible to have them collapse from someone hitting something with the tractor. I would also pull all the banjo bolts and make sure they are clean and clear.

What I would do next.

I would disconnect the position control link. #9 on page 9 of the file I posted. If you move this around and leave the control lever in one position, it will cause the effects and sounds you might hear. I would do this to see if there is a position of the feedback lever that makes the squealing go away. This would indicate that this is out of position. You need to also verify the position lever is connected and moves freely.

If no big discovery there, I would then crack the banjo bolt for the pump output to the valve. This is the smaller top line near the seat #3 page 3. This will make a awefull mess and oil will pump out everywhere, but it the squeal goes away, then that tells you that the issue is in your valve cover and controls under the seat.

If it's in the valve control, then you need to decide if the valve needs to be pulled and rebuilt or adjusted. You might be able to pull the poppet valve and the spool valve without pulling the full valve apart.

What you are explain is what I have seen when the position control valve/linkage is not properly adjusted. But when that is the case, it is usually only in the full up position. If your 3 point is going up and down and squeals thru the full range, then there seems to be another issue. The poppet or the spool valve could be stuck or dirty.

Can you post a pic of the side where you disconnected the loader?

 

[mike48130]

new to me but what 3 positions, I was thinking it was up or down on the handle?

The 3 point lift lever on the right side of the seat adjust the height of the 3 point lift. It can be lifted and stopped in any position from full up to full down.

 

[shannondurst]

lowering valve works, both steels lines are ok, banjos are ok and new orings on both ends, disconnected the position lever and move around and really never find a spot
that's doesn't have chatter or psi noises, I have made the adjustment and compared several times to manual and same issue, no binding with the link you can move front to back
and when p c link is disconnect from lever and move forward the relief is suppose to stop operating, psi goes from 2000psi to 500 psi, never to 0psi unless you push further and there
is no more adjustment left, the control valve is internal, the block for the loader is a adapter plate the goes in between the relief valve and the control valve I just removed it and used shorter
bolts for the relief valve bypassing the loader. on page 49 there is a an adjustment for the neutral position of spool , how critical is this if not correct or could this cause an issue that I am having, something similar? Thanks for the help and advise and troubleshooting material this is what I have been using and nothing matches the troubleshoot tree. If that adjustment is off or spool or poppet stuck or worn would
it cause fluid to flow?

 

[mike48130]

ok. I have worked on the 3 point lift valves a little bit but not in a long time. I think at this point, you probably want to pull the control valve on the side and inspect and adjust like the manual says. Not sure if that is it, but seems easy enough to do. It is possible something is bad in there, but if you say the 3 point raises and lowers, probably not.

If I had to guess, look at the oil flow on page 6. It seems in the neutral position the unload valve is what is the last restrictor the oil sees before returning to tank. On page 46 they show it. If that is stuck, it will cause it to build pressure all the time. I think this all comes out with the side control valve.

 

[shannondurst]

ok the 3 point doesnt lower it was the loader that was jumping and lowering erratically, the 3 point wasnt lowering on its on just didnt want to raise when commanded

 

[mike48130]

Not sure what you are saying. Not very clear.

 

[shannondurst]

sorry about that i was saying that it really never lowered on its own ,i had issue with the loader when it was hooked up, when i commanded the loader up it would lower by its self , like it wanted to drop at times,

 

[shannondurst]

i will follow your tech tips and get back with ya tomorrow thanks again for the help

 

[shannondurst]

I followed the tech tips and troubleshooting information that you provided me and it was the relief valve, spring and poppet, after adjusting the control valve to specs and removing the guts from psi relief valve and running the engine the noise to go away, I found a tractor company in Colorado called FarmLand that sales used tractor parts, I purchased a used control valve 140, when i received I took it apart and found the spring 3/16 longer and the poppet in better condition. I installed and was able to adjust it immediately and alot easier than before with out the fluctuations when the fluid got hot, the loud noise is gone, there is a small noise like a purging sound it could be air, I ran it with a box blade and a rotary tiller and it ran great. Now the only issue I have is when I lift and tilt the loader to the max , I guess the stopping point I get a loud squealing sound coming from the loader side valve , do you have any trouble shooting information on that possibly? Thank you all the help that you have provided you are the Tractor Wisperer for sure, thanks again.

 

[shannondurst]

770 loader