Small Engines (Lawn Mowers, etc.): Hydro Gear transmission slipping, craftsman 917, female pipe

Question
Mower: Craftsman 917.271061 15.5HP Kohler w/ 42" deck.
Transmission: HydroGear 314-0510 (other numbers: 186768, 0026H6091)

It starts out running fine, but then after switching from forward to reverse a few times, or going up small inclines, the transmission starts to whine, then when pushed a little more, starts to growl, without going anywhere.  It has a newer belt.  There is a film of oil around the housing.  I don't see how to check/drain/fill the oil.  I'm hoping it is still repairable, as a replacement is about $425.00.  I'm fairly mechanical, but I have no experience with these.  I'm comfortable taking it apart a little with good advice.  Thanks for your sacrifice in helping us!

Sincerely,
Gary

Answer
Hello Gary:

You Sound like a Person Who Loves Working with your Hands. How About I Give you a Web Site that has a Breakdown of the Hydro. I Just Looked at your Hydro Breakdown. There Should be a Female Pipe Plug in the Top Side of the Hydro for Adding Fluids. This Hydro Uses 20W50 Engine Oil. 78.8oz Maximum. You can View a Breakdown/IPL of this Engine at this Site Addy, http://www.outdoordistributors.com/ and Select the H. Then Select Hydro-Gear. Then Select Don't have Part Numbers. Then Enter the Model Numbers. Then Select your Model and Download the File for Online Viewing. The Plug is # 109. Hope this Helps. I am Here if You Require More Assistance. Let me Know What Happens, Please. Thanks.

Good Luck

Respectfully

John

PS: I am Allowed to Answer 10 Questions a Day. If you See I am Maxxed Out, then Try Submitting your Question at or Just After 9pm EST (US). My New Day Starts then. Thanks.

Respectfully

John