C3973497 XCMG GR2605 motor grader flywheel

C3973497 is an original equipment manufacturer (OEM) flywheel for Cummins engines, serving as the core component for power output and energy storage in the powertrain. Precision-cast from high-strength alloy cast iron, it features a high-precision ring gear mating surface and clutch mounting face. It stores energy during the engine’s power stroke, delivers smooth power output, drives accessories (such as generators and water pumps), and works with the clutch to enable starting and shifting of vehicles/equipment. It is a critical foundational part of the transmission system.

Part Number: C3973497 (often abbreviated as 3973497)
Product Type: Flywheel / Inertia Wheel
Material: High-strength alloy cast iron (wear-resistant, impact-resistant)
Structural Features: Integrated ring gear, clutch mating surface, accessory drive positions
Standard: SAE 2# (public adaptation record)
Ring Gear Teeth: 138 teeth
Maximum Rated Speed: ≤3700rpm
Clutch Bolt Circle Diameter: 333.38mm
Superseded Part Numbers: 3973496, 3282170, 3906808 (public replacement records)
Weight: Approx. 45-50kg per piece (subject to actual)

Applicable Engines: Cummins QSB4.5, QSB5.9, QSB6.7, ISC, ISL, 6BT5.9 (Tier 3), 6CT8.3, QSL9 series electronic/mechanical diesel engines

Equipment: Commercial vehicles (Dongfeng Tianlong, Tianjin, Foton Auman, etc.), construction machinery (Komatsu, Sany, XCMG excavators/loaders/motor graders), forklifts, Cummins industrial generator sets, and marine power systems

Installation Location: At the rear of the engine, connecting the crankshaft to the clutch/torque converter, serving as the terminal for power output and energy storage