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Frazier..... ..ah yes, the "secret" levers thru hollow bolts. This is a "scheme" to block internal hydraulic pump pressure via a lever operated valve in the side of the tranny "vertical stand-pipe" that passes the bottom of the tranny hydraulic power up to yer hip operated hy-trol lever; so you can use the internal 2.85gpm, 1700psi weaksister hydraulic pump corner pressure test port as a hydraulic source for external 1-way hydraulics. Such as hydraulic lift cylinder for HEAVY tow-behind disc harrow.....or.....less satisfactorily, a front end loader (FEL) When you lift up on the lever, you loose yer 3-point lift abilitiy. Why? 'cuz you've cut-off/blocked the hydraulic pressure. Not certain about the spring loaded lever, but I'm certain it is also related to the blocking lever. The earlier "scheme" to gitt corner hydraulic power for remote cylinder, required you to "chain down" the lifting arms. The blocking valve is a "better scheme"..... ..Dell
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