Need advice installing Overrun Coupling on 140

I've been reading here for a while but this is my first post. Recently bought a 140 to do gardening and some rough mowing. I'm brand new to tractors and may have questions that many of you will find funny. If I can get help I'm willing to take that.

I have a rotary cutter coming in the next week, so yesterday went to Tractor Supply and picked up an overrun coupling.

What I bought appears to be exactly like the one on this web page that I found by searching the archives for this board - "http://home.paonline.com/rmweber/COUPLNG.HTM".

I've looked and studied some and have questions and need reassurance that I have it right.

1. I got the 1 1/8 inch one (as opposed to 1 3/8) Is that right for the 140?

2. I've read somewhere about couplers that change the PTO from 1 1/8 to 1 3/8. Is that preferred? I did not know to ask, but now wonder what size the female end of the rotary cutter I'm getting will have (Howse brand ordered through Southern States).

3. I've cleaned the PTO on the tractor good but the coupling does not want to slide onto it. Should it slide on or will I have to tap it on? Should I put grease in the coupling before sliding it onto the PTO (I mean inside the female PTO fitting, of course I know I'll put grease in via the grease fittings...)?

3. The spring pin fits through the holes in the outer ring on the coupler (where the grease fittings screw in) but stops at the inner ring. I will have to tap it in, right?

Thanks for any and all help. I'm thrilled to have this tractor and am really looking forward to learning how to use and maintain it.

I went back this am and traded for a 1 3/8 and came home and installed it. All is good.

scotty

#2. If you have a 1-3/8" PTO shaft on the 140 (easy to measure), then the 1-1/8" overrunning coupler won't fit, even if you tap it with a sledge hammer. You don't say if it won't fit at all, or starts then sticks. If it starts then sticks, it probably needs some grease on the PTO shaft, but just a little. Gobs don't help, and just make the mess that much bigger.

#3. You have to line up all the holes and tap it in, yes. It's a spring pin, and having it fall out would be kinda bad, so it needs to fit tight.