Caterpillar 374D, 374F, and 365C Heavy Excavator Swing Motor Assemblies Enhance the structural upper frame rotation and power efficiency of your heavy mining fleet with premium-grade replacement swing motor assemblies engineered specifically for Caterpillar 374D, 374F, and 365C series excavators. Designed to process immense torsional shock loads during continuous 360-degree slewing in high-volume overburden removal, quarry extraction, and deep trenching, these hydrostatic units guarantee reliable torque output and extended field service life. Applicable Excavator Models and Specifications Caterpillar 374 Series Compatibility: Tailored for Cat 374D, 374D L, 374F, and 374F L large crawler excavators. Caterpillar 365 Series Compatibility: Optimized for Cat 365C, 365C L, and 365C L MH heavy-duty excavator models. Associated Engine Models: Cat C15 ACERT, Cat C18 ACERT, and Cat C15 Diesel Engines. Cat 374D and 374F Hydraulic Swing Motor Group The high-pressure, heavy-duty axial piston swing motor functions as the core rotary mechanism for managing the massive rotational inertia of the 75-ton upper superstructure. Precision-machined internal rotating groups and heavy swashplates protect the primary hydraulic loop against sudden pressure variations and fluid cavitation during rapid deceleration cycles. Part Numbers & Interchangeable Codes Primary Motor Assembly Part Number: 295-9434 Interchangeable Production Codes: 2959434, 295-9416, 2959416, 296-6147, 2966147, 378-9544, 3789544 Associated Gearbox System Reference: 295-9414 Reduction Drive Group Cat 365C Hydraulic Swing Motor Assembly The specialized hydrostatic swing motor assembly for the 65-ton excavator class is built with high-tolerance components that deliver smooth rotational braking torque and eliminate unwanted superstructure drift during precise bucket positioning. Part Numbers & Interchangeable Codes Primary Motor Assembly Part Number: 234-4525 Interchangeable Production Codes: 2344525, 199-4589, 1994589, 234-4527, 2344527 Internal Planetary Reduction Gears & Maintenance Spares To support high-wear fleet preventative maintenance schedules and minimize operational field delays, a full spectrum of exact-tolerance internal replacement components is supported for complete workshop overhauls. Related Service and Repair Elements Rotary Group Parts: Cylinder blocks, piston shoes, valve plates, retainers, and thrust plates Slewing Reduction Gears: Output pinion swing shafts, central sun gears, and multi-stage planetary carrier blocks Dynamic Sealing Systems: High-pressure shaft oil seals, durable casing roller bearings, and complete high-temperature O-ring kits Key Technical Advantages Integrated Pressure Relief Protection: Built-in dynamic cushion and crossover relief valves dampen intense hydraulic pressure spikes during immediate stopping actions, shielding the primary slewing ring teeth from stress fractures. Induction-Hardened Metallurgy: Critical internal planetary profiles and sliding friction parts undergo specialized thermal treatment to resist surface micro-pitting caused by fluid-born contaminants. Direct Drop-In Field Fitting: Machined precisely to match standard factory bolt-hole configurations and output spline structures, enabling a seamless installation process without retrofitting. Related Part Numbers NO P.N. 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