Hello all, I have a 1942 ford 9N. The 3 point quit lifting, I checked to make sure control valve linkage was working properly and it was. Removed rockshaft housing and inspected all parts. Removed hydraulic pump and rebuilt hydraulic pump. Reassembled everything, tractor worked fine for a few days then quit again. Once again checked to make sure linkage forks hadn't popped off control valve and they hadn't. Removed rockshaft and checked over again. Reached down in oil and shoved control valve in pump which I believe should send pressure oil up to the rockshaft? Cautiously started tractor, kicked in pto and no oil came out the oil tube. Shut tractor off and reached back in and made sure valve had not moved back out of pump. Not sure if this was a legitimate check or not but thought it was worth a shot. The only thing I did not replace in the pump was the valve chambers. Maybe it's plugged up with some debris but I would think some oil would shoot out the oil tube. Any advice would be appreciated, I'm at a loss for ideas at this point. Thanks, Seth