Ford 2600 Hydraulics

[Virgilio]

Hi, I have a Ford 2600 that was working just fine. I was using an implement when it would not lift it anymore. The lift arms will lift part ways but not all the way in position control but will lift in draft control. What I've done
Checked fluid levels, Oil and filter under 100 HRS.

took the lift cover off and replaced all the O rings including the piston ring

Checked that all the valves were working (springs etc)
Checked internal linkage for any damage. None.

I know the pump works because it will lift in draft control
Replaced gaskets

When I reassembled it worked EXACTLY as before I did any work.
I need anybody who had same issue to guide me in the right direction.
Thank You for your time
Virgil

[hair bear]

Hi Virgil,
At first it sounds like something is loose, or has slipped in the over-valve linkage. Is this one an early single lever quadrant control with a switch-over lever, or the later variety with two quadrant control levers?
Does it have a pipe for tipping a trailer? if so can it tip a trailer?
In draft control, you have the full range of movement on the lift arms? Do you have full lifting power on the arms?
In Position control, does it always lift to the same height, or does it vary? Do you have full lifting power over the range of the limited movement? When the arms stop, is it possible to manually lift the arms to full height or are they stuck? If you can lift the arms to the top do they stay there or fall back to where they were?
Sorry about all the questions but I'm desperately trying to remember how that all works and it's best part of forty years since I had one in bits!

[Virgilio]

First off I would like to thank you for taking some time to reply.
Ford 2600 year 1980. Double Lever. No tipping pipe. Flow Control Valve on side vs Ford 2000 no flow control valve.
Yes in draft position I have total lift in the arms Including power to lift a 900 lbs implement. This is the reason I believe it is not the pump.
In position it lifts to the same height about half way does not vary from using. In this position it will only lift the implement a couple of inches off the ground.
Yes, when the arms stop I can lift them manually and then they will drop to the limited height.
No apologies necessary for the questions you are not a mind reader (that I know of) so please ask.
I do have an IT manual and did examine all the internal linkage to see if anything was bent/broken/loose but found nothing that I could understand to be wrong/off.

[essexpete]

I don't know anything about these tractors but it does point towards internal linkage fault with the linkage not moving the full travel. You might try The Farming Forum, there are 100s of Ford devotees on there.

[hair bear]

+1 on that, you will get advice from more recent dissections there. It does seem like the internally linked part of the control valve is cutting the supply too early and needs adjusting but I'm stuffed to remember how.
Please do let us know how you get on.

[Virgilio]

Thank you for giving me your time and the tip. I will try The Tractor Forum.

[hair bear]

Sudden silly thought, is the position control lever firmly attached to it's shaft?

[Virgilio]

Yes. I think it must be a linkage problem. I thought I had a good look but I might have missed something. Next tractor down time I will rip it apart again and have a better look. At about 100 lbs the lift cover is no easy task to remove alone.