PTO and Pump

Mike Darlington · Mar 18, 2013

The hyd pump is operated by the PTO shaft. There are cam type lobes on the shaft that move the pistons inside the pump housing. I could not figure out how a square peg could fit in a round hole. Now I know. It's not really. While I have been researching options to get my Ferguson System/Draft Control back in operation I would notice pump repair kits. They call this square a piston. I thought it must have been a misprint or something. Nope, the pistons are on the outside of the square. I think it goes like this, PTO in gear, clutch engaged, PTO shaft rotates, cams on the PT shaft move the squares in and out, which is moving the piston in and out. Genius!

Jeff-oh · Mar 18, 2013

There is a little more to it.

The PTO engages a cam. The cam is two round off-set cylendars. The off-set round cam rotates in a slider (item 26) that is round in the middle and square on the outside. This translates the relative motion into a verticle movement in the pump piston frames (Item 24). And a relative horizontal movement of the pistons in the pump housings (Item 25).

One side effect of this is... you can lift an implement without the engine running. Just place your plow spanner over the PTO splines and rock it back and forth a 1/4 turn or so and you"ll raise the lift. Assuming of course the quadrant is in the up position. The pump does not even have to be engaged.

Jeff

PTO and Pump

Mike Darlington

Member

Jeff-oh

Well-known Member

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