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CAT 307C 2004 Hydraulic Drawings

I've got an older colleague with a 307C 2004-model excavator. He came to me asking if it's possible to find the hydraulic drawings online since he needs to do some modifications to the machine. He's an experienced tinkerer, so if he doesn't get his hands on them he'll probably manage, but it would be extremely time-consuming without references.


Does anyone know where I'd be able to find such schematics?