Overview — Flywheel Assembly A3960780
A3960780 is the flywheel assembly for CUMMINS engines, carrying the starter ring gear and providing the rotating mass and mounting interface for the clutch or coupling. We can supply this flywheel as well as related CUMMINS engine components, in stock or available on order — welcome to enquire by part number.
Parts Characteristics
The flywheel is machined to the original diameter, thickness and bolt pattern, with the friction surface and pilot bore finished to specification. The assembly includes the imported toothed ring gear, hardened and cut to mesh correctly with the starter pinion. The mounting face is flat and the balance is corrected so the assembly runs true at operating speed. As an OEM-spec flywheel, it provides the correct inertia, ring gear engagement and clutch or coupling mounting for the engine.
Applicable Models & Applications
This flywheel assembly is used on CUMMINS engine families that share the specified flywheel size and bolt pattern, covering construction, industrial, generator and marine applications where the original clutch or coupling mounts to this flywheel. Confirm the flywheel diameter, ring gear tooth count, bolt pattern and the crankshaft pilot before ordering.
Maintenance & Replacement
Inspect the flywheel friction surface, ring gear teeth and mounting bolts during clutch or coupling service. Worn ring gear teeth cause starter noise and missed engagement, and a scored friction surface requires resurfacing or replacement. When replacing, fit the flywheel to a clean crankshaft flange, use the specified fasteners and torque in sequence, and check the run-out at the friction surface. Confirm ring gear wear is not caused by a faulty starter before replacement.
Price Reference (USD)
The reference price for this Flywheel Assembly (A3960780) is approximately USD 200 – 800 per unit depending on size, brand grade, quantity and shipping destination. This is a planning estimate only — confirm current pricing and availability with our sales team before ordering.
Value & Service
A flywheel with the wrong tooth count or pilot diameter will not fit the starter or crankshaft, so we verify A3960780 against the original CUMMINS specification and confirm the ring gear, bolt pattern and pilot before dispatch. We stock the assembly with the imported toothed ring and can also supply clutch and starter components for a complete driveline overhaul, shipped worldwide with tracking.
Racer Machinery is a dedicated construction-machinery parts supplier — send us your part number and engine model, and we will confirm fitment, price and lead time for this flywheel assembly and related CUMMINS engine components.
