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In Reply to: Re: need hydraulic help posted by robert horton on Tuesday, February 19, 2008:
Robert: Few questions and I want answers to everyone of them, hard to give advice unless we know a few things. Is this a Farmall or a Utility? Do you know what type of oil is in the syatem? Do you know if the screen is plugged?
This could be a simple fix, however if you carry on as you are it will get expensive. If the hydraulic lines from the pump are warm or hot, this indicates pump is working and at least trying to circulate oil. If that oil is not circulating, continued running of the tractor will only burn up the pump. If you burn up that pump then the fix will definitely become expensive.
Here is what you do first, drain the hydraulic oil. I've forgotten whether drain plug is on left or right, but it's near the base of the hydraulic unit. Wrong oil will cause these systems to seize up. Next remove that screen. I may have been wrong on which side, been 25 years since I sold my 300. The plate I speak of held in by 4 small bolts is about 3-1/2" across, bolt pattern is square, edges of plate are rounded, and about 1-1/2" in center is recessed. Undo those bolts and pull it out, the plate is basically the end plate of a cylinder type screen that goes most of depth across the hydraulic unit. If that screen is plugged, maybe even collapsed, might have a hole in it, however it may be stopping oil flow.
Until you know it has good oil flow, it's pointless to worry about the control valves. They may be seized from lack of oil. They may be seized by the wrong oil. You may have to dismantle all three valves to get then freed up, however it is pointless to do that until you know you have the right oil and it's flowing through the screen. The valves may have to be replaced. What do you know about the history of this tractor? How long has it been run with valves seized? You can probably buy that complete hydraulic unit under dash complete with control valves for $250. from a salvage yard. If you keep fooling around, and just maybe too much of that has been done already, you'll burn up that pump, and that is probably $750.
Hydraulics are like this, you diagnose it quickly, fix it before you destroy something else.