New to me 3550

[Dieseltech707]

Hi all, I just bought a Ford 3550 with a front loader. I am wondering if the front loader hydraulic reservoir is just the left side upright/frame, or also the right side. I see there is fluid in the right upright/frame so I知 thinking you fill in the left and it circulates over to the right as well? I知 trying to figure the best way to change the loader oil.
Also, where is the filter in the trans? It is a 4 speed forward, 4 speed reverse with torque converter.

 

[Ultradog MN]

I'm not as familiar with your industrial model as I am the ag and utility models.
But I thought the hyd reservoir was in the nose of the tractor. Should be a flip up cover on top with the fill cap on it.
Stuff could have been changed in the 45 years since it was built tho.