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There is no hydraulic filter located on the Ford 8N tractor!
under the seat were do you add the hydraulic fluid
That filter is located just ahead of the seat, but under the tractor, it looks like an oil filter.
According to Fram Filters cross reference guide, Ford 7700040 can be replaced with Fram P1654A.
restricted return fluid
NAPA filter oil-1365 hydraulic 11715
under cab in front of rear axle.
left side of transmission
you can look on youtube.
SBA340500960 is the part number for the Case/New Holland hydraulic filter. 86018758 and 86989735 appear to be compatible, as well.
Well, you'd need to specify which filter. Fuel filter, hydraulic oil filter, motor oil filter, air filter? There's more than one filter.
I show 387 SBA 340500920 From my last invoice.