Seems alot of folks have problems with the torque converter and or clutch packs on this machine. I thought I was going through this same problem (low oil pressure and no foward/reverse) but found the folowing problem. I am posting this in case it is useful for others.I recently did a brake job on the 580ck. That is nice. No more clunking and having the balls get jambed beyond the ramps. The seal between the torque tube and the transmission has recently become non-functional, allowing fluid to flow between the two compartmetns. When I did the brake jog, I also replaced the outer seal to the transmission, so I drained both the tranny and the torque tube. I refilled each compartment with 5 gals of Hytran (10 gals total). I though this would be too much because the manual calls for 16 qts (4 gals)each. I started the machine and found low and intermittent clutch pack and torque converted oil pressure. I thought I'd have to drain some oil. However, what I found out was that because the seal is shot and the tractor tilts toward the back, oil from the torque tube was flowing into the tranny case and leaving the torque tube without enough fluid. I ended up having to put in 2 more gals into the torque tube to get the level up onto the dipstick. Once the level was up enough, I had plenty of torque converter and clutch pressure. At least for now. Hopefully the seal wont break apart and clog the torque filter tube. Anyway, I hope this might be helpful. I know its not a true fix, but its a stopgap until the tractor really needs to be split.
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