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East Central Ia | My 305 has two large (3/4'' line) couplers above the left hand side of the remote block. The top one has a "P" stamped into the block and this is full flow hydraulics any time the pump is running... so anytime the motor is running. The one below that has a "R" I think stamped into the block and this one is the low pressure tank return line. I would think this is the one you want. The fan motor on our planter hooks one line up to a remote for the pressure side and the other one hooks into this large return line, and then the case drain hooks into the little flat face coupler.
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CaseIH MX 255 Hydraulics
