This document provides detailed operation and maintenance information for the D61E X-12 and D61PX-12 (JPN) bulldozer models. It covers machine controls, operating procedures, safety practices, inspection routines, lubrication points, and regular maintenance requirements. Designed to help equipment operators and maintenance personnel understand proper usage and care, this resource supports efficient performance, reduced downtime, and extended machine service life. Ideal for workshops, technicians, fleet managers, and heavy equipment operators working with these bulldozer models.