Operation & Maintenance Manual WEAM000101 PC20R -8 PC27R -8 HYDRAULIC EXCAVATOR SERIAL NUMBER PC20R -8 - F30791 and up PC27R -8 - F31103 and up WARNING Unsafe use of this machine may cause serious injury or death. Operators and maintenance personnel must read this manual before operating or maintaining this machine. This manual should be kept inside the cab for reference and periodically reviewed by all personnel who will come into contact with the machine.