The Chicago Pneumatic CP3119 is a 3‑inch straight wheel die grinder that operates on compressed air (typically up to 90–100 psi) and delivers about 1.2 hp of power for high‑speed grinding. Common failures include loss of air pressure or inconsistent flow due to clogged air filters, worn piston seals causing leakage, motor bearing wear leading to vibration or overheating, and electrical issues such as blown fuses or damaged control relays in the on/off switch assembly. For troubleshooting, first verify that the inlet pressure is within spec and that the filter and regulator are clean; next inspect the drive belt and bearings for wear or damage; finally check the motor’s thermal fuse and any associated wiring for continuity or short circuits.[oss-gpt-20b]