PAT DS 350 is a load‑moment indicator (LMI) used on hydraulic cranes; it comprises a central microprocessor, a console with digital or graphic display, a pressure transducer that converts hydraulic pressure to an analog voltage, a length/angle sensor for boom position, and anti‑two‑block switches. Common failure modes include loss of pressure signal due to damaged transducer wiring or faulty transducer, corrupted data from the length‑angle sensor (often caused by vibration or moisture ingress), failure of the anti‑two‑block switch circuit, and display or keypad faults on the DS‑350GW/GM consoles. First‑check diagnostics should verify 24 V DC supply to the microprocessor, inspect all transducer cables for continuity and insulation integrity, confirm pressure transducer output with a multimeter against known load values, and review any stored error codes via the console’s diagnostic menu.[oss-gpt-20b]