Cummins 6BT Series Generator Set Flywheel Assembly 3924434 3925052 3914006 3905470

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Cummins 6BT Series Generator Set Flywheel Assembly 3924434 3925052 3914006 3905470

Fundamental differences between generator set flywheels and truck flywheels
1. Face machining: The face of a generator set flywheel lacks the flat pressure plate contact surface required for clutch friction; instead, it features a ring of specifically arranged threaded holes (distributed diagonally) designed to secure the generator's flexible drive steel plates.
2. Center hole (pilot bearing bore): A truck flywheel has a deep center bore to accommodate the transmission input shaft's pilot bearing; in contrast, the center of a generator set flywheel is typically solid, or features only a shallow locating groove or washer-positioning hole used to align and center the generator shaft end.

Key Technical Points for Installation and Routine Maintenance
1. Flywheel Bolt Tightening Torque: The flywheel is secured to the rear end of the crankshaft by bolts. When tightening, a diagonal, crisscross pattern must be strictly followed, applying the torque in stages. The application of medium-strength thread-locking adhesive is recommended; the use of pneumatic impact wrenches for blind tightening is strictly prohibited.
2. Separate Ring Gear Replacement: If the flywheel ring gear suffers wear or slippage due to frequent generator starting, there is no need to replace the entire flywheel. A new ring gear (159 teeth) can be heated uniformly to induce thermal expansion and then quickly fitted onto the cold flywheel rim; upon cooling, it will shrink and lock tightly onto the flywheel.
3. Dynamic Balance Integrity: Generator flywheels undergo rigorous dynamic balancing tests prior to leaving the factory. During maintenance, it is strictly prohibited to perform uneven grinding or drilling on the flywheel surface. Doing so could trigger severe resonance during high-load operation, potentially shattering generator bearings or causing crankshaft fracture.

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