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Super C hydraulics

J

jhilyer

Member
Hey guys,
I have a Super C that I'm rehabbing. I've had it for about 15 years, but stopped using it 5 years ago because of several problems, one of which being hydraulic oil was leaking from under the seat assembly. It's got Fast Hitch.

What IS that valve block that protrudes out from under the seat? That's where it's leaking. Before parking it years ago I tried to get the seat assembly off - no luck. Can this valve block - or whatever - be bypassed and replaced with modern components? Does anyone have a schematic of the hydraulic system?

I'm not trying to "restore" this tractor, I just want to make it work in my small haying operation, so I'm not worried about putting it back to original condition.

Thanks in advance,

- jhilyer
 
The valve is a check vavle to slow down hydraulics so implements can not slam to the ground, I just took mine off about 2 weeks ago, no problems, I also switched my hoses at the cylinder so my control would work like all the rest of my tractors--- push control forward and implement goes down pull back and it goes up
 
It is not really a check valve. It is a flow control valve. It is suppose to be hooked into the extend side of the cylinder. As Rex said, some guys on here will unhook it with no problems. In my opinion, don't do it. I have a 5' rotary mower and a 7' sickle mower that I run on mine. They will both come slamming back to the ground in a hurry. That is a good way to get hurt. Not to mention hard on attachments. A leak under the seat could be 2 or 3 things. The hoses that screw into the back side of the block could be leaking or the hoses themselves. The valve it self can only leak out the ends that have plugs in them. You would be able to see that. My money is on the hoses. JMO
 
You don't have to remove the seat box to service that. Disconnect both hoses at the cylinder and remove the 2 bolts the hold the block to the seat box and pull it and the 2 hoses out.

I had a problem with my SC's FH bleeding down and it was due to that valve leaking. I removed it and ran 2 new hoses from the auxiliary control valve to the cylinder.

It probably should be there if your not going to pay attention. Without it you could drop a heavy implement hard enough to damage it. I pay attention and slowly let implements down.
 
It is a double acting check valve used to keep the cylinder on the Fast Hitch from settling with a load on it. When the control valve is in not directing oil to the hitch both check balls are seated sealing off the cylinder from the valve. When the control valve pressurizes one side that ball is lifted off the seat to allow oil to pass. At the same time it moves a small piston in the block between the check balls which unseats the other ball allowing oil to pass back to the control valve. By controlling how much oil is sent to the cylinder you also control how much the other ball becomes unseated allowing you to control the speed even with a load on the cylinder.

Unless something is broken it is just a matter of replacing the O-rings to reseal it.
 
sure
I have one FH SC that the PO removed it entirely and replaced with modern hoses from remote valve to cylinder. works fine.
(I'm used to Fords where lowering the lever slowly is required to stop a heavy implement from crashing down)
Like said, you don't have to remove the seat box to get it off.

Lots of options with a fast hitch...
on another, which had a hopelessly broken remote and hoses and that little box junk, and the under tank hydraulics junk,
I just removed the remote, made a diverter plate, looped hydraulic pressure thru an open center valve mounted on the side of the seat box. Valve return hooked to the center hydraulics drain plug hole. remote hoses to the cylinder. works fine...up-down, didn't need that tilt stuff, just needed to raise lower my 3-point equipment with the FH adapted.
(I've since modified that setup to just 'vent' the down pressure on the cylinder when lowering and looped the 'down' hose on the valve to the temp sender fitting hole under the tank so the valve wouldn't deadhead when lowering.
(I didn't like the cylinder having down pressure...too easy to unload the tires with some implements.)
 
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