Farmall 300 transmission oil service

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Farmall 300 transmission oil help, I split the tractor and replaced some gears, cleaned out the rear end housing and the housing for the t/a, clutch and the ipto driven gear housing. My question is how do you fill the transmission back up correctly? There is a sump under the sun gears of the t/a that I had to suck the oil out of, how does that fill back up? any input would be great!
 
Mine has a front drain plug for that part, but they may not all be the same. On mine there is a hole between the front and rear sumps that allows the oil to find its own level. The oil goes into the rear compartment, and I found that it helped if I parked the tractor with the rear end inside the shed and the front end down about 8 inches at the bottom of the ramp for a bit after filling to encourage the oil to migrate forward.
Zach
 
As Zach indicates. Fill on the right side of the platform the 3 bolt cap. Level on the left side by the clutch pivot. Hytran or JD Hy Guard. The TA is filled from the trans through a groove channel. The PTO needs to be drained and filled separately. Jim
 

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