Cummins Diesel Engine Spare Parts Flywheel 3021393
Description
Technical Parameters
Cummins Diesel Engine Flywheel 3021393
Precision Kinetic Energy Storage for Heavy-Duty Applications
What It Is
The 3021393 is a heavy-duty flywheel assembly designed for Cummins' largest displacement diesel engines. It mounts directly to the engine crankshaft and serves as the mechanical interface between the engine and the drivetrain-carrying the ring gear for starter engagement and providing the friction surface for clutch operation-1.
In engines producing upwards of 1,800 N·m of torque, the flywheel isn't just a rotating mass-it's the primary energy storage device that keeps power delivery smooth and protects the entire drivetrain from torsional shock--1
Design Features
Three-Layer Construction
The flywheel employs a functional three-layer material architecture:
| Layer | Material/Process | Purpose |
|---|---|---|
| Base material | ASTM A48 Class 40 cast iron (345 MPa) | Structural integrity and vibration damping |
| Friction surface | Induction-hardened (HRC 45–50, 2 mm depth) | Clutch engagement durability |
| Ring gear teeth | High-frequency quenched | Starter engagement wear resistance |
Precision Balancing Technology
The flywheel is dynamically balanced to G6.3 balance quality per ISO 1940 standards-1. This is achieved using 3D-printed tungsten inserts strategically placed to correct mass distribution without compromising structural integrity-1.
The result is minimal vibration transmitted through the crankshaft, directly extending the service life of main bearings and reducing operator fatigue in equipment with long duty cycles-2.
OE-Level Machining Tolerances
Laser-cut splines with 0.01 mm positioning tolerance ensure perfect alignment with Cummins crankshafts-1
Weight optimization at 55 kg (121 lbs) minimizes rotational inertia while maintaining sufficient energy storage capacity-1
Radial runout is held to ≤0.05 mm after installation
Technical Specifications
| Parameter | Rating |
|---|---|
| Part Number | 3021393 (Rev. K, 2025 revision)- |
| Material | ASTM A48 Class 40 cast iron-1 |
| Outside Diameter | φ800 mm (approx. 31.5 inches)-1 |
| Width | 150 mm-1 |
| Weight | 55 kg (121 lbs)-1 |
| Ring Gear Teeth | 120-1 |
| Max Continuous Torque | 1,800 N·m (1,328 ft-lb)-1 |
| Max Rotational Speed | 1,800 rpm-1 |
| Friction Surface Hardness | HRC 45–50-1 |
| Balance Quality | G6.3 (ISO 1940)-1 |
| Service Life Certification | 20,000-hour bench test (40,000 mining hours) – TÜV SÜD certified-1 |
| Manufacturing Standard | ISO 16949 |
Why It Matters
The flywheel in a KTA38 or QSK38 engine stores enough kinetic energy to carry the engine through the compression stroke of each cylinder-without it, the engine wouldn't idle smoothly and would stall under load changes. More critically, in a mining haul truck climbing out of a pit, the flywheel's stored energy is what keeps the drivetrain moving during gear shifts.
The 3021393 is built for this duty. The combination of ASTM A48 Class 40 cast iron base, induction-hardened friction surface, and G6.3 dynamic balance delivers a flywheel that doesn't just spin-it stores, smooths, and survives. TÜV SÜD certification at 20,000 bench-test hours (or 40,000 mining hours)-1 isn't a marketing claim; it's a validated service life.
Replace it with the genuine part, torque it to spec, and it will outlast the equipment it's bolted to.
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