Re: relief valve for Farmall M Hydraulics?

Posted by Andy Martin on July 04, 2001 at 17:11:11 from (38.31.74.83):

In Reply to: relief valve for Farmall M Hydraulics? posted by Lugaidh on July 04, 2001 at 08:54:29:

I missed your earlier messages. My neighbor and I both mow with M's on NH haybines. I had a 461, now have a 479, he had a 469 and now has a 488.

The belly pumps work fine with a 3" or 3-1/2" cylinder. If the pump is worn they will be slow when hot. 30 wt hydraulic oil helps.

I bale about 12,000 square bales all mowed with this haybine, so it is not occasional use.

Note that the belly pump has four positions. When you pull the rod all the way back it will lift. There is a detent, and you can let go of the rod and it will stay back. When the cylinder stops and the pressure rises, the rod will self release to the raised position. When you push on the rod, it will let the cylinder down with the rod moving to the third position. As soon as the flow stops, the valve will block the flow in that position. To get full release of the cylinder you have to push the rod a bit further. On a flat field this is not important, but in hilly ground or going over terraces, the third position will keep the header from floating down further than where it first fell. This third position was for holding cultivators at the level they first hit the ground. The detent in the raise position is real handy as you can get both hands on the wheel as you try to cut a sharp corner where you have to lift the header as well. Getting down to the short rows.

I think the belly pump is well suited to haybine operation.

Make sure you have the rod end of the cylinder vented.

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