Shuttle and HST are in the same manual.
I have the service manual and let me tell you it ain't much. I usually make it a practice to haggle the service manual in the price of a new piece of equipment but this time I think I don't think I got much. If I'd paid real money for it, I would have been ticked off. You can get an idea by looking at the operator's manual, if anything the service manual is worse. Instructions are pretty much take it apart and put it back together the opposite of how you took it apart. Not much in the way of detailed info and not one stinking part number in it. Crappy low detail sketches and images throughout. You get a vague general notion and that's about it. There was not even a engine wiring harness diagram, just chassis wiring. No ECU codes, basicly little to nothing else in it that you can actually use.
Oh yeah like the operators manual, ever who wrote the service manual, English was not their first language and from the looks of it not even their second language.
Before you spend your money, you've been forewarned.
For as little info as there is in it, it should be free and downloadable from Mahindra's website.