9N Hydraulics not operating, did go up once...

[FiremanKyle]

Well, I've done some more work on my Dad's tractor (probably might as well consider it mine). The Hydraulics on the initial run went up and wouldn't go down. The Hydraulic/Trans fluid was low, but is sufficient now. This been parked for a few weeks, so the lift arms finally reduced some tension. Today my friend and I each stood on separate lift arms and did a little hammering/tapping on lift shaft arm, the lift arms finally lowered. Now the Hydraulics almost appear to be dead. There is now no action with the lift arms at all (up or down). When Exercising the Touch Control lever when in the lower position it seems to want to spring back. I do not see any issues when looking in the inspection cover (right side) currently.

Tractor sat for at least 10 years with no usage in beautiful Michigan. I'm thinking it might be best to clean the pump and change the oil, since it may have never been changed. So other than those basics, what could be the the most problematic issue that we think this could be, with out going for a total Hydraulic pump repair kit.

Thanks for some insight.
 

[souNdguy]

that lever is just mechanical linkage.

time to pop the hyd side cover off and see if the control fork is hooked to the 'T' shaped valve in the pump and actually moving it gfreely in and out like it should.

70 ys of gunk and grit and water tend to make this stick.. especially when they set unused for 10ys at a pop..
 

[JMOR]

Check fork to "T" on valve for connection as shown. The touch control lever trying to spring back up, from the down position is normal, as when you push it down, you are stretching a spring & that spring wants to pull back to its pre-stretched position. That is why the cork friction disk is there.
 

[ZANE]

Stuck or disconnected control valve.

Zane
 

[Bill Rowles]

If it were mine, I would remove the PTO shaft and pump to clean it out real good. However, if you have never removed the pump on one of these tractors, I recommend getting some help from someone who has done it. It is both messy and tricky to disconnect the control valve from the fork and also takes some skill to reconnect it.
 

[39Ford]

Anyone have a photo or some tips on how the pump connects to the linkage? My '39 came with the pump out of the tractor, and I cant seem to figure out how it all goes together.
 

[FiremanKyle]

I got a Hydraulic repair video that is an oversight, which shows the key points to for removal/repairs. so far I have the three pt lift arms disconnected and the top ring bolts loosened, Just go to find a container big enough to hold that much oil (thinking a tote).