Hydraulics

[JLeus]

Recently purchased a good condition
MF 255 with front end loader and
working towards putting a third
function out front.

First question is about spool valve
matching to pump flow?? Tractor Data
shows GPM of 10. Is an 11 GPM spool
valve appropriate for this or should
the spool have greater capacity. Is
there matching that needs to be had
between the spools and the pump for
the long term good health of all?

Also, I am not understanding why the
most often guidance is a diverter
valve for 3rd function. There are 3
spool valves on the market with
individual control and 3 spool with
2 on a joystick and the 3rd on a
lever. Is it just for the
convenience of one control?

The machine I bought has a joy stick
but I actually prefer a lever for
lift, a lever for curl, and then put
the third spool on third function
with couplers......call me silly,
just my preference.

I just see the cost of each being
relatively the same if not a little
cheaper for 3 spools.

Your thoughts are greatly
appreciated.

Jim

 

[Janicholson]

Flow rate specification should be at the pump rating, or larger. larger hurts nothing but money if taken to excess. Go with your preference. Jim

 

[caterpillar guy]

If that is a closed center system the valves are different than an open. Not sure which it is.

 

[JLeus]

It's open, return line to reservoir. Thanks
Jim

 

[Bob N.Y.]

There are different ways to set up remote hydraulics on the smaller Masseys. A diverter valve is used when taking hydraulic pressure from the main pump (3pt. hictch) for a remote cylinder. It sounds as if your tractor is equipped with an auxiliary pump which is a separate flow circuit from the 3ph. There is no need for a diverter valve with the auxiliary pump.