B290-5/B390-5/B490-5 Operating Manual

Operating manual for Grinding & Polishing Machinery Corporation belt grinder models B290-5, B390-5, and B490-5. This workshop manual covers full operation and maintenance of these industrial abrasive belt grinders, powered by a robust 5 HP 3-phase motor running at 3450 RPM with voltage options of 220, 440, or 550 volts. The manual details specifications for 2–4 inch wide abrasive belts and 8 inch contact wheel configuration. Detailed sections address lubrication schedules and procedures essential for reliable machine performance. Belt tracking adjustment, pivot lock and swivel lock calibration, and belt tensioning via pneumatic air cylinder are explained step-by-step so operators can maintain consistent grinding results. Contact wheel tire replacement is covered with clear instructions for proper installation. A comprehensive numbered parts list with exploded views allows quick identification of components for ordering and service work. Essential troubleshooting guidance helps resolve common operational issues. This manual is the authoritative reference for technicians and operators maintaining or servicing these three grinder models in production and fabrication shops.