Farmall H Hydraulics. Help!

Bryce Frazier · Jan 29, 2015

Hi all, I have decided to post this down here too, let me know what you think! Thanks, Bryce

Alright, so, I have been trying to do a little research, and EVERYONE has a different answer for me, so SOMEONE PLEASE point me in the right way on this!!

On my H (1944) There is the control handle and 1 plug on the right side.

There is a weired looking spring/plug thing on the top, must be filler huh?

And then on the left side, there are two more plugs!!!!!!

WHAT ARE THEY???

The guy I got it from said that if I was to put a loader on it, I would run it off of the ports on the left side, and the loader it's self would have it's OWN valve body and up/down control. Then I could still have a remote, power out, glide back, out of the plug on the right??

What am I looking at?!?!

Thanks, Bryce

D Slater · Jan 29, 2015

All 3 ports have pressure out and fluid return through the same ports. Only can use with single acting cylinders unless another valve is added to the system. If hooking to a single acting cylinder on each side of tractor, use the right and front left port. Left rear port has a separate check to open when lowering. Pull rod back to get pressure and push forward to lower. Yes that's the fill cap. If its still there it will have a fluid level dipstick under it.

Janicholson · Jan 29, 2015

The ports are configured as follows. The right port and the front left port are connected to a "T" inside. they both get pressure from the same valve at the same time. They are ONE way, that is fluid that leaves from them comes back through them.
The left rear port is a lowering delay port that allows the rear implement (like cultivators) to be lowered later than the fronts. It is operated by a combination of pressure sensing and control rod position. (Part way in past the hold position of the rod is the delay position) Few applications use that port, leave it alone. By the way it also gets its pressure from the same source and valve.
Maximum pressure is about 750 to 800 psi. System capacity is 6 quarts.
To use two way cylinders, the open center valve must have its discharge returned to the reservoir sump. The lever control is then pulled out and locked in the raise position to provide pressure for the 2 way valve. Jim

Bryce Frazier · Jan 29, 2015

Okay, that all makes sense.. So if I wanted to run a 1 way cylinder on a sickle mower or plow (only things I have with hydraulics) should I use the Left Front, or Right one? Or does it not matter?

Janicholson · Jan 29, 2015

No difference between them. If two cylinders are used, and connected one to each side front port, the pressure on each should be the same. (like a front loader lift cylinders. If not the one with the less force will move first, and last, making predictability unusable. Jim

Bryce Frazier · Jan 29, 2015

Right on! Thanks very much! Bryce

rustyfarmall · Jan 29, 2015

(quoted from post at 08:30:58 01/29/15) The ports are configured as follows. The right port and the front left port are connected to a "T" inside. they both get pressure from the same valve at the same time. They are ONE way, that is fluid that leaves from them comes back through them.
The left rear port is a lowering delay port that allows the rear implement (like cultivators) to be lowered later than the fronts. It is operated by a combination of pressure sensing and control rod position. (Part way in past the hold position of the rod is the delay position) Few applications use that port, leave it alone. By the way it also gets its pressure from the same source and valve.
Maximum pressure is about 750 to 800 psi. System capacity is 6 quarts.
To use two way cylinders, the open center valve must have its discharge returned to the reservoir sump. The lever control is then pulled out and locked in the raise position to provide pressure for the 2 way valve. Jim

Jim, I have taken those pumps apart. The rear port on the left side is screwed into the same manifold as the right and left front ports. The "delay" is an optional accessory that screws into the left rear port. If that accessory is not present, the left rear port will function the same as either of the other 2.

Janicholson · Jan 29, 2015

See D Slater comment below, there is mechanism involved
Jim

D Slater · Jan 29, 2015

In picture the two pins below the lever with white marks release the pressure checks for ports. One pin releases the front two ports and the other releases the left rear pressure. when control lever is pushed forward the front port pin releases first. When rod is pulled back pressure is sent to all three ports at the same time.
Think Jim was saying the same thing.

rustyfarmall · Jan 29, 2015

(quoted from post at 10:35:46 01/29/15) See D Slater comment below, there is mechanism involved
Jim

Apparently not all belly pumps are configured the same. The one I took apart, from a 1941 H, was configured so all 3 ports recieved pressure from the same source, at the same time. It really doesn't matter though, because there still will not be any delayed action unless the optional accessory is first installed in the hose.

D Slater · Jan 29, 2015

No ones saying all three don't pressure up at the same time. Just that the left rear passage has a separate ball that is pushed off the seat to release pressure back.
See check balls in right of picture. One goes to the left rear port and one to other 2 and 2 different pins push the balls off the seat. Balls are spring loaded so pump pressure pushes them back and pressure goes to all ports at the same time.

rustyfarmall · Jan 29, 2015

(quoted from post at 13:24:48 01/29/15) No ones saying all three don't pressure up at the same time. Just that the left rear passage has a separate ball that is pushed off the seat to release pressure back.
See check balls in right of picture. One goes to the left rear port and one to other 2 and 2 different pins push the balls off the seat. Balls are spring loaded so pump pressure pushes them back and pressure goes to all ports at the same time.

Yes, I understand that all of that, but there still will not be any delayed action to the rear port. The "delay" comes from the optional valve which is installed in the hydraulic hose in between the belly pump and the rear gang of the cultivator.

Without that optional valve, the rear port on the left side has the same exact function as either of the other two.

D Slater · Jan 29, 2015

Maybe someone did mention delay action for pressure. If so I missed it.
You are correct a delay action valve needs to be added for delay.

Farmall H Hydraulics. Help!

Bryce Frazier

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D Slater

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Janicholson

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Bryce Frazier

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Janicholson

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Bryce Frazier

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rustyfarmall

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Janicholson

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D Slater

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D Slater

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D Slater

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