107-7977 1077977 Caterpillar Alternator

107-7977 Caterpillar Alternator GP-Charging OEM 1077977 Fits 320B 325B D6N Parts Product Information Brand: Caterpillar Category: Alternators & Starters Part Number: 107-7977 Part Name: Alternator GP-Charging (24V 70A) Alternative OEM: 1077977 / CA1077977 / 132-2156 / 0R8279 Engine Model: Caterpillar 3116, 3126, 3126B, 3306, C9 Compatible Equipment: Caterpillar 320B, 325B L, 330B L, 345B L Excavators; D5M, D6M, D6N, D6R Dozers; 950G, 962G, 966G Wheel Loaders Condition: 100% New Aftermarket Replacement 107-7977 Caterpillar Alternator 107-7977 1077977 Caterpillar Alternator 350 365B 365B II 539 561M 561N 572R 107-7977 1077977 Caterpillar Alternator 3126B 3176C 3196 320B 325B L 330B L 3412 345B Product Function & Specs: Heavy-duty 24-Volt, 70-Amp charging alternator built to withstand severe engine vibration and high heat. Features high-quality internal windings, durable bearings, and a robust regulator to deliver a stable electrical output. Keeps the machine battery charged and powers vital cab electronics, lights, and controller systems under continuous working loads. Failure Symptoms: Battery continuously drains, or the machine requires regular jump-starts to run. Dim or flickering cab lights and instrument cluster displays during high-load operations. Dashboard battery charging indicator warning light stays on while the engine is running. Abnormal squealing or whining noises coming from worn-out alternator bearings. Quick Installation Notes: Always disconnect the master battery switch or disconnect the negative battery terminal before starting installation. Inspect the drive belt and automatic tensioner for signs of cracking or wear; replace if necessary. Mount the alternator securely to its bracket and align the pulley correctly with the belt path. Ensure all electrical terminals and ground wires are clean, free of corrosion, and tightened firmly to prevent voltage drops. FAQ: Q: Can this part replace OEM 107-7977? A: Yes, 100% interchangeable. Mounting bolt patterns, pulley dimensions, and the 24V 70A electrical specs match the original Cat assembly exactly. Q: Is this an OEM or aftermarket replacement? A: This is a premium aftermarket replacement alternator utilizing heavy-duty internal components for long-term service life. Equivalent performance at a much better value. Q: Which machines are compatible? A: It fits numerous Cat machines, including 320B and 325B excavators, D6M and D6N dozers, and 950G to 966G loaders. Send us your engine or machine serial number to double-check before ordering. Q: Does this alternator include the pulley? A: Yes, our alternator assemblies generally come complete with the drive pulley pre-installed and ready for belt mounting. Q: Do you support bulk orders? A: Yes. We offer wholesale rates for parts distributors, electrical repair workshops, and fleet maintenance yards. Contact us directly for bulk terms and shipping estimates. Why Sourcing From WinsParts? We match your part numbers directly against official parts catalogs to ensure a 100% correct fit. Our large physical inventory allows us to ship orders fast, minimizing your machine downtime with dependable parts.