I'm sure that Hoye, LMTC, Sheaffer, maybe tractor Ernie, and some others all have a manual available. If there is something specific you need to know, post here and it's probable you'll get some advice. Welcome to tractorbynet!
I've contacted 5 or 6 different places in the U.S. that sell yanmar manuals, they either didn't reply or didn't have one that covered the YM1301D.
I've contacted 2 sellers on ebay who sell Yanmar manuals one claimed there is no repair manual in English for this model, the other didn't respond. I'll check out those names in case I missed them.
I'm not trying to repair at the moment, I just like to have manuals for when I need them.
You are not going to find an English version repair manual for a ym1301. You will have to use a manual for the closest US sold Yanmar. There probably is a parts manual available for it. The writing would be in Japanese but many think this is more useful than a repair manual. I have a repair manual for a ym220/226 which I'm told is the closest cousin to my ym2002d. I have found it to be very helpful but there are considerable differences. Hard for me to believe those vendors 284 listed can't help you.