Where Can I Find a Comprehensive Bulldozer Repair Manual?

I recently purchased a used bulldozer and I’m preparing to do some much-needed maintenance work on it. While I have some mechanical experience, I want to make sure I have the right technical guidance before starting any major repairs. A detailed repair manual would give me the proper step-by-step instructions, diagrams, and specifications I need.

I’ve checked a few online marketplaces, but many of the manuals I’ve found are either incomplete, poorly scanned, or clearly not official editions. This makes me hesitant to spend money without being sure I’m getting an authentic product. I’m specifically looking for OEM or factory manuals that match the exact model of my bulldozer.

In addition, it would be great if the manual also covered troubleshooting, preventive maintenance schedules, and parts breakdowns. I don’t mind paying a fair price, but I’d prefer to compare options before committing. Digital access would be ideal, as I’d like to download and use it instantly rather than wait for shipping.

Does anyone know a trustworthy source where I can find a reliable and complete bulldozer repair manual?