Cummins Onan 201-1055 Genset Rotor Armature and 50 similar items

Cummins Onan 201-1055 Generator Rotor Armature Fan Hub Casting – New Old Stock (NOS) Condition: NEW OLD STOCK (NOS) — Authentic OEM Original Equipment Brand: Cummins Onan / Onan Corporation OEM Part Number: 201-1055 (201A1055 variant) Casting Number: 170-1533 Equipment Type: Rotor Armature / Fan Hub Assembly CAGE Code: 44940 (Defense Logistics Identifier) Product Overview Genuine Cummins Onan rotor armature fan hub casting designed for the heart of diesel generator sets. This critical rotating component mounts directly to the rotor shaft and provides mounting points for cooling fans while supporting the armature windings for proper electrical generation alignment. Type: Generator Rotor Armature Fan Hub Construction: Cast Iron with Slot-Wound Armature Configuration Function: Rotating magnetic field core for electricity generation Mounting: Direct shaft attachment with balanced precision tolerances Stock Status: New Old Stock—unused OEM surplus inventory Technical Specifications Attribute Specification Primary MPN 201-1055 (201A1055) Casting Reference 170-1533 Overall Length 14.7500 inches (374.65 mm) Overall Diameter 5.7500 inches (146.05 mm) Armature Construction Slot Wound Material Cast Iron (Core Casting) Balance Specification Dynamic Balancing per OEM standards CAGE Code 44940 (Government Supply Chain) Sub-Part References 00-959-3240 (related assembly) Fan Integration Cooling fan mounting hub included Compatible Generator Models This rotor armature was specified for Cummins Onan diesel generator set series including: Generator Series KW Ratings Engine Types Onan HDK Series 12 kW, 20 kW, 25 kW Diesel (HDKAG, HDKCA, HDKCB variants) Onan HGJ Series 30 kW, 40 kW, 50 kW, 60 kW, 80 kW Diesel (HGJADF, HGJADG, etc.) Military Specification Units Various tactical power ratings Marine Ground Support Equipment Note: Rotor/stator assemblies are often only available as combined units from current OEM—this represents legacy NOS component availability. Critical Installation Considerations Balancing: Pre-installed dynamic balance must be preserved during handling—no modifications to counterweights Shaft Clearance: Verify exact bore diameter matches replacement shaft specifications before installation Air Gap Adjustment: Set proper stator-to-rotor air gap per OEM manual to ensure voltage regulation Winding Inspection: Check slot winding insulation integrity—visible damage indicates rewinding required Fan Alignment: Install cooling fan to prevent overheating during generator operation Bearing Prep: Pack new bearings with high-temp grease before final assembly Related Part Cross-Reference This rotor armature interacts with several other critical generator components: Stator Assembly: Stationary copper coil surrounding rotor (requires matched pair installation) AVR (Automatic Voltage Regulator): Controls excitation current to rotor windings Exciter Rotor: Provides field current for main rotor magnetization Brush Holder: Carbon brushes contact slip rings for field excitation Package Contents (1) Cummins Onan 201-1055 Rotor Armature Fan Hub Casting [New Old Stock condition—no original packaging] *Note: Does NOT include stator, AVR, bearings, or mounting hardware unless pictured* *Verify compatibility against your specific generator serial number before purchase* Search Keywords Cummins Onan 201-1055, generator rotor armature, Onan 201A1055, 170-1533 casting, slot wound rotor, diesel generator parts, NOS generator components, Onan alternator rotor, HDK series generator, HGJ series rotor, 80 kW generator part, military genset repair, cast iron fan hub, rotating magnetic field, CAGE 44940, replacement armature, generator rebuild kit