Two Banger
Member
How much could the hydraulics on a 1940 Farmall M lift?
- Thread starter Two Banger
- Start date
I believe the M had about an 800psi system. I don't have the "pie" sign on my keyboard, so Pi X the radius of the cylinder squared X the 800psi of the system will get you close.
So a 4" cylinder would be 3.1416 x (2 x 2) x 800 = 10,053 lbs. Now there is always a little loss from friction, etc., but 5 tons would be close. this drops off pretty quickly for a 3.5" cylinder to about 7700 lbs or about 5650 for a 3" cylinder.
If the M system is other than the 800psi, then figure that in. However, any mechanical leverage would need to be figured in if it's something like a tillage tool, and that might be almost impossible unless you are a mechanical engineer.
So a 4" cylinder would be 3.1416 x (2 x 2) x 800 = 10,053 lbs. Now there is always a little loss from friction, etc., but 5 tons would be close. this drops off pretty quickly for a 3.5" cylinder to about 7700 lbs or about 5650 for a 3" cylinder.
If the M system is other than the 800psi, then figure that in. However, any mechanical leverage would need to be figured in if it's something like a tillage tool, and that might be almost impossible unless you are a mechanical engineer.
Janicholson
Well-known Member
Originally the PSI was in the 650 to 700 range Minus wear of the years. The relief valve pressure setting could have been upgraded to the 800 psi number, but only a pressure gauge will be able to assess it for sure. As the others have said, cylinder area, and mechanical linkages are the numbers to crunch. At high idle (wide open) the pump pushes ~6 GPM so it is not going to be radically fast with a big cylinder. Jim
650psi with a 4" cylinder would be 8168#. If the pump is 6 gpm when it's a good pump, that 4" cylinder would move approx. 1.8" per second. I'd bet at 650psi, unless that is a near perfect pump, it won't move that fast. No load it would probably do that or a little better.
Had to figure this stuff all the time when I worked and built fixtures for hydraulic systems. Been retired for over 7 years, so it's fun trying to remember how to do it
.
Had to figure this stuff all the time when I worked and built fixtures for hydraulic systems. Been retired for over 7 years, so it's fun trying to remember how to do it
.Two Banger
Member
I'm not trying to lift anything, I am restoring an M and I was just wondering what the hydraulic pump would lift.
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