Super MD-Hydraulics

Does anyone know the basics of how the hydraulic system works on these tractors? There are several ports that oil can either come from or return into but just not sure of the system and whether or not is just for single acting cylinders or double acting? Any ideas or places to go for more info.?

do you have live or a belly pump?


Andrew

The Live Pump Andrew discusses, is located behind the front cover, and in front of the distributor.
A Liftall Belly Pump is internal behind the clutch.
With a live pump, We would need a picture to see what has been put on it. With a Belly Pump, the fittings on the housing of the tractor (Elbows usually) are all pressure lift, and return combination. The system is intended to use one way cylinders. Lift with spring or gravity return. the right rear port is a delay action port for use with equipment intended to lower after the front, or raise after the front (usually cultivation equipment to finish and start rows fully) Both left and right front ports are hooked together inside and operate like they have a "T" in them going to the pump.
So single hoses are used and oil returns through those hoses. It will make about 6 GPM at about 800psi if it is in good shape. Jim

It is a live pump. I have seen others in times past and they have more controls and valves than I. I feel my tractor has the basics but may be missing some parts. On the right side of the oil resivor or the brake side of the tractor I have little knob sticking out you can only turn with vise grips.

You probably have the stock ONE-WAY hydraulics.

That's ASSUMING someone didn't cobble something together that's totally non-stock. A picture would help us identify what you have.

The knob is supposed to have a lever on it. Someone broke it off in the past. It would normally have three positions:

1. back = lift
2. center = hold
3. forward = lower

I just got done explaining this in another thread, but here's how to add 2-way hydraulics:

1. Get an open center spool valve and mount in a convenient location.
2. Run a hose from one of the outlet ports on the rear of the reservoir (not any of the pipe plugs that go into a flat side of the block) to the IN port on the valve.
3. Hose from the OUT on the spool valve to one of the pipe plugs on the side of the block. There's a 1" pipe plug on the back where the christmas tree valve would normally mount.
4. Run hoses from the work ports to the rear of the tractor and add quick couplers.

To operate, you would pull the lever on the side of the reservor back and lock it there, then run your spool valve normally.

In your case you need to fabricate a lever, weld it on, and see if your system even works.