Michael,
I too have a Koyker front loader for my SD 1840 and I have learned not to load it too heavily. If you learn the lube specs please let us all know. I'd love to know the New Holland model number that is supposed to be similar. I purchased a Ford manual that was supposed to be similar and the profile of the tractor is similar, but all the levers etc are located differently so its of no value to me.

Rich