DONALD - Not sure how big a pump you have on your loader 129 but I suspect soft keystock should be plenty. Hope it's 3/16 inch. That should be big enough to run 8-10 Hp with.
I'm always afraid hard keys will tear up pulleys & shafts. Back when I was buying automobile shredder rotor parts everything was hardened EXCEPT the drive heys for the rotor parts, they were all made from 2" or 3" square 1018 cold rolled steel bar then lightly dusted off on a Blanchard grinder to remove any "Twist".
Hydro Harry - Since we're discussing splash lube systems. Anyone have a Kohler K-series block with a "Window" in it from a failed rod or ????
I'm thinking that someone should do an experiment with some clear Lexan, tube of RTV, some small hardware maybe. Set up a test engine and run it to see just how much oil flys around inside at different speeds. Be an interesting video for U-tube.
Guy who I worked for summers in college, Township road commissioner was helping his Son combine corn one fall, pulling two empty wagons home from town, seems like He was running a 930 or 1030 Case but may have been an early 1070 with cab. Heard a "BANG" and saw some oil spray on the cab window, slowed down and pulled to side of the road, crawled out of the cab and saw the HOLE in the side of the block. Engine was still idling on five cylinders, crank & rods on those five cyl. all doing their jobs. The offending rod & piston assembly was found in the weeds back where the bang was heard clear up by the fence 20 ft from the edge of the road. JI Case had a weak batch of rod bolts.
Component failures make for some interesting problems. Saw an 855 CID Cummins in a Trans-Star IH semi tractor, wrist pin failed on about #3 cylinder at govered RPM. The conn rod flailed around and sawed EVERYTHING apart below the top deck of the block except the crankshaft. Yes, the WHOLE engine was scrap.