Trojan 1500 wheel loader

Hey I just got a Trojan 1500 wheel loader and I don't know and cant find much info about it. I do know it has a Cummins motor which I thought was a good option. I would like to know what kind of tranny is in it and how much oil it should hold. Seems like it is low on oil in forward gears and I cant ever get a good read on the dip stick. when it is off and cold it reads oil but running and in neutral it shows nothing and to me that's seem when you should check it. Also is there any adjustments on the tranny? It seems like a good tight loader so any info any one has would be great

Thanks