Great oracles of the SkidSteer Forum...I have a mystery....Looking for a little help as I am stumped..... I have a 1998 High-Flow 863 with an 811 backhoe attachment and the aux hydraulics will not lock. The momentary and lock LED's turn on and I noted that when the momentary LED was on only the thumb switch would activate the hydraulics moving the switch to the left....moving to the right...nothing...no sound no hydraulic pressure...this of course being the controls on the right hand side. I switched the connectors to the solenoids and was able to activate the hydraulic "lock" using the trigger....yet the backhoe attachment would "dead head". After some checking I confirmed that BOTH solenoid coils work as I switched solenoids and moved each to the "electric solenoid valve" (some folks call these stems) that was working. Additionally I flipped the electrical connectors to the solenoids to verify that the momentary thumb switch works in both directions.....it does. As a final step, I moved the "electric solenoid valve" (stems) from the non working side of the Hydraulic Control Valve to the other...it worked when switched to the previously working side of the Control Valve. I did note one odd thing, when referencing the Bobcat Service Manual, I cannot pull out the "Auxiliary Spool" from the non working side of the Control Valve once the Auxiliary Spool Cap is removed along with the centering springs....the spool seems to hit something inside of the Control Valve. Any ideas? A free mystery gift for the person who helps me solve this one!!!! Albert