D6C Transmission Oil Change?

Hey guys,
Decided whole the undercarriage replacement on the 6C is going on I might as well do a complete service on the machine.I am changing all the fluids and filters and am ready to do the transmission next.I am wondering what kind of oil if I need to use a special 30 weight or would an orschleans/tractor supply brand universal tranny and hyd oil work and what all there is for transmission filters and screens that need changed and their locations.Also info on the hyd Oil and filter screens would be greatly appreciated to.My C is a 76A serial prefix..thank you in advance for the help all.

Cat 30W trans drive train oil works best its made special for the steering clutches and trans disks. It will give you good service. Available in five gallon containers. Gary

oil should meet Cat TDTO4 spec--many oil companys produce it