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Ford Tractors Discussion Board

NAA PTO replacement


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Posted by buck eye al on September 27, 2012 at 10:57:05 from (168.251.194.11):

Several weeks ago I posted asking a question about replacing the original PTO with a 1 3/8" PTO. I had purchased one & installed it but things were not going well. I had placed the old PTO in gear before removing it then pulled it out & the new one slid right in. Once in & with all 4 cap screws started I took it out of gear & it turned freely. Put it back in, it did not turn. All looked good. Took it out of gear again & then started to tighten the bolts testing for free rotation of the shaft. As soon as the lock washers started to flatten the shaft locked up. Took the side cover off to make sure the shifter was operating properly & nothing was bent. All looked great.

I posted a question here asking about the possibility of a need for shims to set a specific position for the shaft & was advised there ought not be any such a need.

Tinkered some more and removed it & measured total length form gasket surface forward to the end of the shaft. New was about 30 thousnads longer so I cut another gasket, installed it & everything works perfectly.

Wanted to thank those who replied. It's not my tractor. I was trying to do the owner (a widow) a favor and this presumed simple job had me sweating for a while!

I do however have another question....

Being much more familiar with green painted critters, I'm a bit ignorant of the NAA. Did it have one gear lube reservoir like the N series tractors or does it have separate compartments? Is maybe the fluid I've drained (looks and smells like 80/90 GL5) ONLY the rear end & transmission lube while the hydraulic system is still good in some other chamber or is this oil used byu the hydraulic pump?

I know the NAA is altogether different with its live hydraulics from the N series. Does it use 80-90 GL-5 for it's hydraulic flid just like it's predecessors or does it need a lighter hydraulic type fluid instead? It's been parked for several years back in a low overhead part of a barn without lights so it's a flashlight job until I can get it out but I don't want to do something stupid with the fluids.

Thanks again.


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