Hydraulic/transmission Strainer

[MarkB6200D]

Upon removing the trans/hydro strainer on my B6200D it pulled a thread out the middle of the threads in the aluminum case. I have been looking for the size of the thread size and pitch so I can chase the threads with a tap. Is it metric? Is it standard? I can’t find anything online about the size. I even took it to a local hardware store to try to thread a nut on The strainer threads. Nothing was big enough. It would appear it is a 1 1/16 or 24.035 when mic’ed not totally sure of the hardware store clerks ability to measure.
Can anyone help me to find the true thread and pitch for the strainer?

 

[100 td]

Probably not listed in literature, someone may have it, go to an engineering supply shop and get a thread pitch gauge put on it and measure with a vernier for accuracy.
Be very careful if using a tap to clean the threads, it is extremely easy for a tap to pull in aluminum due to damaged threads and you make it worse. One other option is the use of a thread file to help clean out the existing threads. Ensure you don't score the area where the oring runs, if it has one.
This style with special ends can be handy for nuts or internal threads.
https://www.amazon.com/dp/B075NN5FF8/
Thread pitch gauges can be handy over the years if you do a bit of wrenching.
https://www.amazon.com/dp/B01B4BOOXW/
Oil seal picks can also be used to clean out debris from the thread. If you find a bolt of the correct size, cutting slots down the threads can turn your bolt into a thread cleaner. Go real easy with aluminum, you don't get a second chance.
YMMV

 

[North Idaho Wolfman]

Its metric and very fine thread, the chances of finding the right tap would be very very rare even at a good machine shop.
Not much equipment uses threads like that.
So buy a new strainer, and like 100 td said, using the old strainer with a die grinder cut the screen off then cut a slot at a slight angle threw the threads, coat the threads in anti seize and run it in and back out to clean up the threads, then new o-ring use anti seize on the threads and reinstall the new strainer.

 

[MarkB6200D]

Thank you gentlemen for your guidance. The thread measurement was 14 when measured with the thread gauge set. I have already bought new o rings and strainer. Talked with a machinist friend who also recommended picking and probing the area where the thread was missing to help clean it up before chasing the threads. He also suggested using the steel threads of the old strainer with anti seize to help with compression and removal of pieces of aluminum. Since the case threads are softer aluminum.

The cause of this is just the beginning of maybe another issue. I found a couple of small 1/8 inch or less chunks of gear type metal in the bottom of the transmission reservoir and it could be a future issue. Probably caused this issue in ripping a thread out on removal of the strainer with a piece of metal caught on the threads inside the case. The previous owner had the clutch replaced within the last 200 hours. So hopefully those issues were a past issue solved already. It shifts fine.

The good thing about this if there is anything good. (And there is not anything good) is that the threads in the case are quite long and maybe an inch in depth. The missing thread is half way back or so. Lots of good threads in front of the bad area. I will try to clean it up with a pick first. I have a few picks. I will also cut the threads on the old strainer and give it a careful attempt with a little anti seize paste and be very careful while doing it. I was hoping that it was easy to find a tap and clean out and straighten out any out of shape threads. Lessening the chance of any further damaged threads would be nice. But cutting the threads on the old strainer will serve the same purpose. Nice idea. Wish me luck.

Thanks

 

[MarkB6200D]

After much research trying to find the proper thread and pitch size of the strainer/filter with no luck. I really wanted to do it with the proper tap. The dealer wouldn't help and Kubota customer satisfaction at USA headquarters wasn't any help either. They did try a little and sent diagrams of the inside of the tranny, but I wasn't working on the inside. I was pretty persistent and called and emailed for 3 days seeking the proper information on a possible tap size.

I ended up doing just what you guys suggested and made a tap out of a new strainer and all went well. The little guy is back to working just fine now.

Just wanted to say thanks again for your suggestion.

Mark