I contacted Shaver and it turns out that they have adapters for various makes of tractors including Mahindra and RKs. I ordered a Sm-41-R adapter and picked up a piece of 4" 3/4 pipe to get past that hydraulic stub that's next to the reservoir. (I hope no one is an idiot and tries to temporarily...
Hightide did you ever find out the exact thread and diameter? I bought an HD8 and I'm running into the same problem and I have about 60+ acres that I should already be fencing. Thanks for all of your feedback, this is the only place on the internet that I have found any info on the cap and...