I have all the books for your D7 3T. Back in the day Cat had separate books for each attachment, the blade, the hydraulic system or cable control unit. I've scanned all of them and submitted them to the ACMOC library. If you are a paying member you can access them for free. I have them for sale now. Below are the ones for the basic tractor. I have the other ones also. Send me a PM and let me know what you need.
Craig