Have a 7800 that bolt broke in bottom control valve on transmission, started to leak but still would drive, removed control valve, removed broken bolt, put back together with new gaskets and plate, now won't move. Have had off and on 4 times. I'm sure I have the shift linkage engaging spools properly. I have pressure to the 1-4 gears no pressure at fwd or reverse, transmission system pressure is at 250 psi and lube is 18 psi. Checking pressure at port marked clutch I have 30 psi with clutch pedal up 0psi with clutch pedal depressed. I took front cover off transmission, removed clutch spool and found spring broken inside and a hole wore in clutch spool. Replaced those pieces and removed and inspected all valves, assembled and no change in pressures.