change hydraulic oil on 3600

[gil1]

I want to change the hydraulic oil on my ford 3600, but can't locate the drain plug or where to check the level.

 

[RickB]

Drain is at the bottom center of the rear axle center section housing. Fill plug is at the toop of the same housing next to the draft control spring housing. Level plug is a 1/4" pipe plug with either a male head or female hex located behind the right footrest and at nearly the same level.