How old is the grandson? Just thining that anything over five years old he should be able to do a lot!
Any chance he has a cell phone and could take some pictures of the oil as it is leaking? Just remember oil runs down hill so have him keep looking up till he can get a picture of where it wet stuff starts.
Also any chance of some picture of the machine from both sides and maybe looking down from above behind the cab. I worked on many 966C over the years and had more tha a few right down close to a bare frame but I'm draying bit of a blank on some details.
One more thing please post a full serial number as it will give access to online info many here have.
SERIAL#76J2480 1969 966C
Looks like the Grandson has been taken back by my Daughter...something about school and wrestling and lord knows what else, she is intentionally vague about those things sometimes, Lol.
The manual I have is not the same one you did the copy/paste from. I can see the Watermarks on yours with the manual/media number and others. I do not have that and the copy/paste is not there. It is looking like it may be an individual Cat dealership rendition, missing details such as bucket flat on ground, engine idling, etc. I ran into something similar trying to get info about the #24 cable control unit on my D7 17A. I finally got it straight from the old guy in the back of the shop, cleaning parts and waiting to retire or die, whichever came first. He Knew everything the guys up front thought they did.
I am going to obtain a Borescope/endoscope, have a decent one on order. I can see extending it through the floor in the right place and being able to see things instead of just wondering about them! Why, it's almost like magic! Ha Ha, we will see, it is an interesting Idea though. I used one on my septic system and saved myself some troubles but I have never thought about using one for this purpose. Can an old dog learn new tricks/ Are the tricks worth learning?
I see that Nige has posted a manual reference. I appreciate the help you guys are giving. It is something that Is no longer common with the changing world.