I worked as a field service equipment mechanic for 40 years. Repair/ replace damaged or worn parts Operate/ inspect machines Diagnose faults or malfunctions to define required repairs, using diagnostics Routine maintenance work on equipment Examine parts for damage or excessive wear, and also keep equipment service records Read/ understand operating manuals, and also technical drawings. Test machines/ equipment for operating efficiency Adjust/ repair hydraulics Rewire, and also troubleshoot electrical systems.