Open center hyd's allows oil to flow through control valves at low to no pressure while pump is pumping until the control valve is activated to divert oil to a function such as cylinder then pressure is utilized to move cylinder piston.
Closed center hyd builds pressure which is stored in hyd lines then when a designated pressure is reached which is called stand-by pressure(2250 psi) on JD hyd system the pump ceases to pump because pressure is sent to interior of pump pushing pistons away from the rotating shaft. When pressure drops then springs force pistons against the rotating shaft & pumping begins again.
CLEAR AS MUD right?
Important thing is one needs correct type control valve for either type system!
Does your 2240 have side frames on each side of engine? If not I suggest acquiring some.
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