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Your advice was excellent. It reduced the amount of chips produced plus I have the 1/4" NPT tap and plug. A 7/16 " drill would not go through the remaining original threads so I did drill those to 7/16". Tapping the hole went well and I cleaned the tap about every 1/2 turn. I also used a shop...

Thanks again for all the replies and suggestions. I have attached a couple pictures of the plug as requested. The threaded portion of the bolt beyond the washer is only about 3/8". From what I'm hearing from you, finding out what the original threads were won't lead to the best solution because...

Dave - Thank you for your suggestions. Pictures of the hole are in my first post. When I said I found the flange bolt and seal washer, I meant I found them in the parts diagrams at the site provided by NIW, but I could not find the thread information that he said was listed. I don't know how he...

NIW - Thank you for the great link to the parts breakdown. I think I found the flange bolt and the seal washer, but I can not find the thread size. Can you tell me how to find that? Thanks again.

You asked a good question and I don't have a good answer other than I was gun shy after the experience with the stripped plug - I didn't want to disturb the other one that I had already installed. Also, I didn't realize it would be so hard to identify the thread size because of the close...

I did take it to the local hardware store, but it is hard to compare stripped threads with good ones, especially when there is a 12mm x 1.25 and a 12mm x 1.5 to choose from. My best guess was the 12mm x 1.25, but that would not screw into the hole. I also called Kubota customer Service and they...

I have stripped the threads on the rear axle housing transmission drain plug and hole on my ZD326. I can see in the hole that there appear to be good threads beyond the stripped portion in the hole. My plan is to install a longer bolt in place of the stripped plug, but the bolt I tried to...

I am changing the transmission/hydraulic oil on my ZD326. I stripped the threads on the drain plug and in the hole in the rear axle gear case. My plan to reinstall a plug is to install a bolt longer than the plug and use the undamaged threads that are normally beyond the end of the plug which...