The Acu‑Rite MTS30M4‑48 is a 140 V DC brushed servo motor (NEMA 42) used in CNC and industrial control systems; it typically drives 3 kRPM loads with a current range of 6.8–37 A. Common failure modes for this model include brush wear or loss, commutator degradation, phase winding shorting, and mechanical bearing seizure, often triggered by over‑current or thermal cycling. Initial troubleshooting should verify that the motor receives the correct supply voltage and current limits, inspect brushes and commutator for signs of wear or damage, and check the drive electronics for fault codes or abnormal torque/position feedback. If these checks are normal, perform a no‑load run to confirm mechanical integrity and look for unusual vibrations or noise indicating bearing failure.[oss-gpt-20b]