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Discussion Forum
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Re: Farmall H lift all Hyd.

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john d

03-17-2002 06:28:45




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Steve C and The Red gave you good information. What else you need to know is: use NON-detergent SAE 30 oil in it, and the dipstick that came in it is apt to be missing. I don't remember how much it holds; probably around 5 quarts or so. Hydraulic fluid may be used instead of SAE 30, but it tends to be thinner at higher temperatures, so you may lose a little pressure if using it.
The front port on the left and the port on the right side are on the same circuit. The rear port on the left side is a "delayed" circuit, designed to lift after the front circuit so it lifted rear cultivators at roughly the same place the front units were lifted when operating in 3rd or 4th gear. If the front ports are capped, the rear port lifts without delay. All three ports are OUTLET, and are used with single-acting cylinders. The hydraulic system lifts, and gravity lowers! No extra return line from the cylinders is needed; just a "breather valve" in the end which does not receive pressure. Oil flows from the port to the cylinder when the control rod is pulled, and flows back from the cylinder to the port when the rod is pushed all the way forward. When the rod is left in the half-way position with the little tab on the bottom of the rod hooked on the support bracket, it will hold pressure in the cylinder. There should be a little spring clip on the bracket to hold the rod in place when it's in the middle position. These springs have a fairly short life and yours may be missing. Be advised that if it's missing, a hard bump in 4th or 5th gear can "jump" the control rod out of position and lower the load when you don't want it to! For double-acting, or two-way cylinders, you need some additional valving. This can be done; do a search for info on this site if you want to know more about that.
If the oil is kept clean (always clean the connections well before coupling and un-coupling the hoses) these systems will last a long time. I have a '49 M with a pump that hasn't been apart since we got it '52, and it's still a good one.

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