Caterpillar Forklifts C3000-C6500 description of the catalogue:

Caterpiller Forklifts Service Manuals and Wiring Diagrams

C3000 AT81F-00011-up
C3500 AT81F-00011-up
CC4000 AT81F-50001-up
C4000 AT90-00011-up
C5000 AT90-00011-up
C5500 AT83F-00011-up
C6000 AT83F-00011-up
C6500 AT83F-50001-up

Chassis & Mast
C3000 AT81F-10121 to 30120
C3500 AT81F-10121 to 30120
CC4000 AT81F-60121 to 80120
C4000 AT90-10121 to 30120
C5000 AT90-10121 to 30120
C5500 AT83F-10121 to 30120
C6000 AT83F-10121 to 30120
C6500 AT83F-60121 to 80120

This manual has information about the layout and names of main components, procedures for disassembly, assembly, inspection, adjustment, maintenance, and pinpointing faults which are in effect mainly for these models.
Since the parts used in this machine are subject to change for the sake of better quality, performance enhancement, and safety, some portions of the contents and illustrations of the "SERVICE MANUAL-Chassis & Mast-" may not be identified.

Most accident happens due to the disregard of basic safety rules or precautions. In order to prevent accidents from happening, the factors responsible for accidents must be avoided beforehand.
For this reason, please read this manual and fully understand the precautions for safety and the proper procedures and directions for inspection and maintenance before starting operation. Performing maintenance and repair without adequate knowledge may cause inadvertent accidents.

It is not possible to cover all the possible cases of accidents in this "SERVICE MANUAL-Chassis & Mast-". Therefore, attention should be given to precautions other than the ones mentioned in this "SERVICE MANUAL-Chassis & Mast-". Especially, when repair and maintenance work which are not covered in this "SERVICE MANUAL-Chassis & Mast-" are carried out, always work under the direction of an instructor who understands the matter.