Magnetek 4020D-155 22020902 Servo Motor

The Magnetek 4020D‑155 (serial 22020902) is a brushed servo motor used in industrial motion control systems with an integrated encoder and power supply board. Common failure points for this model include worn commutator contacts, brush wear or loss of polarity, damaged windings due to overcurrent, and corrosion on the drive PCB leads; overheating can also cause insulation breakdown. First‑check diagnostics: verify 24 V DC input voltage and continuity of motor windings, inspect the commutator for pitting or missing segments, and review any drive error logs (e.g., overcurrent, encoder slip) before proceeding to component replacement.[oss-gpt-20b]

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