I recently purchased a 642B, It came with a deluxe enclosed cab with a lexan door, but was never equipped with auxiliary hydraulics! The third spool is present in the valve, and the tubes run to the left side of the machine and are capped. I can create a linkage for the valve myself. It probably won't allow me to use the auxiliary circuit "on the move" but I don't think for my purposes I'll miss that ability. I'm considering using hose for the rest of the circuit instead of buying the (expensive) OEM tubes. I think I can attach the hoses to the inside of the loader arm so they will clear everything nicely and using a pair of hoses deletes four extra connections which can leak. Does anyone know what diameter of hose and what diameter and type of fitting is necessary to connect to the existing tubes in the tractor? For a machine this old, would the quick connect fittings be the common agricultural type connectors? I'm not sure they had flat face couplings back then, and anything I may use will certainly be either old, or something I'll make myself (so I can choose whatever fittings I want.) As near as I can tell, about seven feet of hose will be approxiomately the right length. Does this plan sound reasonable? I'm trying to keep this a low-budget project; I'm not sure how often I'll even use the extra hydraulic function so I want to minimize cost and inconvenience. Any input will be appreciated. Thanks!