I have a Prime Mover LL-40 (similar to a LD-50 loader) forklift with a Sunstrand hydrostat. My problem is I can't figure out where the oil fill/level check plug is located for the transfer case. I see the drain at the bottom of the case, that is easy. The owner's/operator's book isn't any help even with the IPLs. Other than the drain, the only other opening is an access cover.