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
- Thread starter x063910
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Would be better to ask this down in the 9N/2N/8N forum down lower.
You may have a bad set of gaskets on the pump or the relief valve is stuck open which would also cause you a problem. While you have it apart it would be a good idea to change it over to the new improved NAA type piston and o-ring set up and that cost around $25 and is well worth it
You may have a bad set of gaskets on the pump or the relief valve is stuck open which would also cause you a problem. While you have it apart it would be a good idea to change it over to the new improved NAA type piston and o-ring set up and that cost around $25 and is well worth it
Charles in Aus.
Well-known Member
Does the 9N have a riser tube from the pump to the top cover ? If they do then it might be worth looking through the side cover while the pump is running to see if there is any turbulence visible or oil pouring down from the top corner back into the casing .
Yes it does have a riser tube, before I tore it apart I pulled the inspection cover off and watched it running, there was some amount of turbulence from the pump and pto shaft turning but it didn't seem like an excessive amount. But there was no oil pouring down from above.
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