The Komatsu PC40MR‑2 is a compact hydraulic excavator equipped with the standard Komatsu control and hydraulic system. Common failure points on this class of machines include hydraulic pump cavitation or seal wear causing low pressure, electric motor overheating due to inadequate cooling or bearing failure, and faulty hydraulic line fittings leading to leaks; electronic control modules may also fail from power surges or moisture ingress. For a first‑check diagnostic, verify that the main 48 V supply is stable and within spec, inspect all hydraulic lines and fittings for visible damage or fluid loss, and review any recorded fault codes on the operator console before proceeding with motor or pump inspection.[oss-gpt-20b]