Posted by IH fan on September 13, 2013 at 18:33:38 from (174.70.169.139):
In Reply to: New To Me 1966 IH 504 posted by Florida 504 on September 12, 2013 at 18:24:15:
The "lift pump" for the 3 point is either a 4 1/2 or7 gpm pump, mounted on the either 12 or 17gpm pump. The 12 or 17 gpm pump supplies the auxiliary valves and PS. pumps may be rated at 2250, but the relief valves for both systems is 1550 to 1600 psi. A tractor without a lift, either 3 point or Fast Hitch, will have a cover in place of the smaller pump. So there is a separate relief valve for the rear lift system and for the auxiliary. It may be that the auxiliary relief valve is weak and there may just be a leverage advantage for the bucket tilt, so it appears to work fine where the "boom" does not. You already have the aux. valves off, so the next step is the transfer block and that is where the relief valve is located.
I realized the 504/2504 is in the same I&T manual as my 240U... number IH-201... has a pretty good section on the hydraulics.
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