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640 hydraulics

X

xring 223

Member
a little history to start. hyd. on rear did not work but the front blade worked perfect through the operating valve or remote valve mounted under seat took top off checked all valves new O-rings and gasket. All hyd. worked great. Decided to sell the tractor but wanted to keep the front blade. Unhooked hoses from valve and plugged them, rear hyd. quit took valve off replaced with bypass plate. have taken top off three times checked every valve replaced o-rings and gasket again. still no hyd. bled pump took side cover off looking for leaks or bypass nothing HELP PLEASE
 
Well, if the pump had flow and pressure to run other things, but no 3pt, then i'd look at the cyl and valve body under the cover. might be stuck in unload and just dumping oil..
 
thank you for that I'll check that valve after this weather clears to cold to be out at present time I live in WV and the weather just turned bad and I have very little heat in the garage.
 
Xring,
Some of the terms you are using have me concerned.
First let me state that the 3 point gets its oil AFTER the hydraulics that come out under the seat. With that in mind, could you be diverting the oil away by using your "bypass plate"?
Before that when you "plugged the hoses" how did you do that?
The original plate that goes under the seat basically BLOCKS off the oil flow to allow the pressure to go to the 3 point.
HTH
Keith
 
the correct term is blocking plate and the hyd valve is off the tractor but I plugged the hose fittings at the valve body
 
(quoted from post at 09:43:01 02/03/15) the correct term is blocking plate and the hyd valve is off the tractor but I plugged the hose fittings at the valve body
Click to expand...
ctually.............if you put the original plate back on there (FO-20 & I call it accessory plate), it does much more than 'block off", as it provides several connecting paths via the plates passages, which direct flow required to make the 3 point lift function.
 
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