This service manual provides maintenance and repair information for the CX45B, CX50B, and CX55B mini excavators. It contains sections on the excavator's engine, hydraulic systems, frames and ballasting, tracks and track suspension, cab climate control, electrical systems, booms, dippers, buckets, dozer blade and arm, platform, cab, bodywork, and decals. The manual includes detailed diagrams and part numbers to guide technicians in servicing and repairing components.