Need thread size on master pin plug

I believe it's 3/8 fine thread on the D2

Thanks OM,
I'll try it again but 5/16 was too small and 3/8 seemed too big. I do have nf taps. I wanted to clean up the threads before I tried to pull it with a bolt.
Jim

I tapped mine out with a 3/8 NC tap. The threads looked coarse to me but they were badly rusted. The cork plugs were long gone. I tried pulling 4 plugs (2 different dozers) and had no luck. You will need a grade 8 bolt and some hydraulic means of pulling. I even had the plugs and pins glowing red hot and still nothing. Ended up striping all the threads. Finally torched them out and the pins still hammered out hard. Hope you have better luck them me.

I'm surprised you could tap them at all. The plugs seems to be hardened when I chased the threads.

smf52, What size hammer did you use? I assume you used a sledge hammer and a drift? Did you need a helper? The inside plug is missing and the pin has worked it's way to the outside about 1 1/4". The outside plug is still in place but if I could remove it I was going to drive it back in place. If I can't get the plug out in place, maybe I could drive it out from the inside and deal with the plug on the bench.
Jim

The standard hammer we used at the dealer was a 16 lb.for driving pins in & out.For the drift (driver) we had a piece of wire rope (cable) welded on it for the 2nd guy to hold on to so if the hammer missed it saved a trip to the hospital.For real HD jobs we had a couple 20 lb. ones to use.

Boy! There ain't much room to swing a BFH from the inside of the track. Looks like this may take a while😊 .

The standard hammer we used at the dealer was a 16 lb.for driving pins in & out.For the drift (driver) we had a piece of wire rope (cable) welded on it for the 2nd guy to hold on to so if the hammer missed it saved a trip to the hospital.For real HD jobs we had a couple 20 lb. ones to use.