Need to get all the manuals for this unit.
There are three types of manuals available for this machine.
Operation & Maintenance (aka O&M). Covers all the basics of controls, warning systems, operation, and details of all the scheduled maintenance tasks plus info on recommended fluids, etc, etc.
Parts. Exactly what it says on the tin. A complete parts listing for the machine.
Service. This is a full repair manual for the machine, covering System Operation, Testing & Adjusting, Specifications, Troubleshooting, etc. It also contains schematics for the electrical & hydraulics systems and includes a copy of the O&M.
NOTE: If you buy a used one in paper format always ask the question "Is it complete?" because the O&M and schematics have a nasty habit of going AWOL.
Caterpillar Publication References & (new) Prices:
O&M - SEBU9084. Paper $57, CD $49.
Parts - SEBP5971. Paper $156, CD $109.
Service - UENR3725. Paper $1,035, CD $733.
Try searching for "Caterpillar + UENR3725" or any of the other publication references and something cheaper than the above prices may pop up.