Cat | Service Manuals, Parts Manuals & Maintenance Manuals Caterpillar offers parts manuals, operation & maintenance manuals and service manuals. Contain procedures for safely and effectively testing, adjusting, troubleshooting, disassembling and assembling current or legendary Cat products. Systems schematics and detailed technical descriptions of systems theory are also included in these manuals. CAT Manual Download – Caterpillar CAT Manual PDF Download The process of disassembling and assembling of all components is described in details in every CAT PDF repair manual. We have PDF manuals for repairing all Caterpillar engines without which you will not able to do properly do the overhauling. There are also electrical and hydraulic schematics in CAT PDF service manuals.