Ferguson T0-20 Hydraulics, 3 point will not drop down ?

[harrisl]

I have a 1950 Fergy TO-20, when using it with a grader blade to clear snow last week about 45 min. into the job the blade wouldn't drop but a couple inches.
I checked the manual but the trouble shooting guide lists a possible Seized ram due to scored or binding cylinder, binding control valve, or cap screws on lift arms too tight. I've had this tractor for 5 or 6 yrs. and haven't had any previous problems with the lift. When I checked the oil it was milky which I would take to be water. I changed the fluid a couple years ago and refilled with TSC 80/90 wt gear oil. Now I know when I drain it this time to use GL-1 mineral type. The lift did lower after 2 or 3 days setting until I started it up again then it raised back up. Ice maybe?

 

[harrisl]

Found it, not ice. The Control spring rod was broken anyone know where to find a replacement. I might be able to make one but would rather buy if available, looks like I may need the yoke also if I can't get the piece out of it. Has anyone had any luck removing the shaft without removing the whole top of the unit.

 

[Soundguy]

should be same pump and top cover essentially as a ford 9n / 2n.

hyd cyl and piston are different.. but the rest of the top cover parts are liekyl similar.

post a pic and aprt number of the part you need.

soundguy

 

[harrisl]

Found the parts from Yesterday's Tractors still don't know how to get the top plate off. The book I have talks about removing the side plates to disconnect some fork from the control valve?? I don't have a schematic or exploded view to work from. It appears that the pin I need to remove cannot be taken out without removing the top as the pin is to long to slide out enough to release the "Draft Control Spring Plunger" from it's fork. I think this may have been intentional to prevent possible dropping of the pin into the gearbox if the cotter pin came out.
Thanks
Larry

 

[Soundguy]

As the directions told you, remove the side round inspection covers, reach in and spread the control fork that hangs from the top cover down tot he pump.. this control fork will be hooked to a 'T' shaped part which is connected tot he control valve. If you don't spread the ford and remove if fromt he t-valve.. you will break it then be in for a might fine repair job.

you -really- should get a service manual for this machine... even if it is the I&T model from tractor supply. hyds are covered in that manual.

soundguy

 

[Soundguy]

Here.. I did your homework for you.

Here's a schematic of the valve, and a schematic of the lift control fork on a 9n which will be very similar to the one on a fergy. Heck.. the fergy valve even still carries a 9n (ford) part number prefix. The t valve sticks out o fthe pump, and the control fork hangs from the top cover..

soundguy

 

[harrisl]

Thanks the pic was a big help it allowed me to identify the control valve. I got lucky in removal of the top and don't think I did any harm to the valve or crosspiece. I couldn't see what the forks hooked to and don't think I spread them coming out. Finally got it back together and fought the forks on, only a few cuts.
when reassembling the top portion the replacement part was a little different in the plunger rod is stepped up so I had to open up the hole in the triangular guide to 11/16". I think the heavy top spring may have been broken in the past which is likely what caused the plunger to break. The on on the tractor is closed on one end only and the other end is open and rough like it has been broken. If anyone has a Fergy would you look at the spring and see if both ends are closed.
I will be going to TSC to get a manual as soon as I can the closest one is 30 miles away like everything else.

 

[Soundguy]

Post back if ya hit any issues.. as i said.. the fergy lift is very similar to the 9n/2n ford one. minor parts diferences.. but more similar than different.

soundguy

 

[harrisl]

Found a local guy has a Fergy just like mine the spring is about 3 coils longer than the one I have and is closed on both ends.
Thanks for all the help.
Larry

 

[Zork]

Hey Soundguy, good morning.

Is this the same problem I had the other day?

I was tilling my garden and the lift when up and sounded as if it was in a bind at the top. It would not go down. I turned off the pto pushed the control handle down and parked the tractor with the lift up. The following day the lift had crept down and now it works perfectly. Previously the transmission seemed to make noises when the lift control handle was midway and now it doesn't make that gear rumbling noise anymore and the lift will drop with the handle even though the pto is not running- something it would not do before. The oil is clean and smells good, although I just got this tractor so I do not know how old the oil is.

What is the fix or should I thank a repentant Gremlin? Thanks.