Ford 601 Hydraulics not working

[iancart]

I am new to the forum and this is my first post so please forgive me if I do something not per procedure.

I am in need of help.

I have a Ford 601 (641 Workmaster I think.) I bought it with non-functioning hydraulics with the assumption that I could break loose the control valve and be good to go. I live in southern Indiana and as far as I know the tractor has for some time as well.

Now for the list of things I have attempted. (in order)

1. Changed the fluid
a. Used Ford GL1 per manufacturer specifications.
b. Removed approximated a quart of water from a honey/milk colored cloudy fluid.
c. Cleaned sump
2. Removed top cover
a. took apart the assembly containing the control valve and the unloading valve.
b. removed both valves cleaned and reassembled.
3. Replaced Saftey valve
4. Used 1/2 by 24 bolt to remove Check valve
a. replaced o-rings and reassembled.
5. Removed and rebuilt lift piston.
6. Removed Hydraulic Pump.
a. Applied air pressure to both inlet and outlet to ensure no blockages in line.
b. Replaced with new pump
c. bled pump and verified functionality
7. Checked inside using viewport on left side next to the PTO lever No fluid leaking.

I still get absolutely no response.
Any advice would be very much appreciated.
Thank you,
Ian

 

[Soundguy]

1, gl1 is NOT the reccomended hydraulic fluid.

I'd put utf in there.

2, is the pump now pumping? If so, and the unit is in unload mode.. the oil just returns to sump.

3, did you test the top cover with air to the hyd inlet port?

 

[iancart]

Pump is definitely pumping. You are absolutely right about the oil returning to the sump. Unloading Valve moves freely. How do I remedy this?

New information, pulled the top cover again. Air applied to intake goes to sump return untill control valve is moved to the lift position. At this ponit the air moves the unloading valve to the forward position. Removed the check valve plug and verified that air pressure was present, it was. Lift arms did not budge. However when I move the arms manually to the full upright position the unloading valve returns to the dump position. When put back on tractor no oil reaches the control valve.

 

[Soundguy]

weird... check backpressure valve..