Alternator 12V 45A 390040 for Cummins 4BT3.3 Diesel Engine
Alternator 12V 45A 390040 for Cummins 4BT3.3 Diesel Engine
Available in stock
Product Description
Part Name: Alternator Assembly
Part Number(s): 390040
Brand Compatibility: Cummins
Machine Type: Construction Equipment / Industrial Engine / Generator Set
Condition: Brand New
Shipping: Fast worldwide shipping with secure packaging and reliable delivery in 2–7 business days.
The 390040 alternator is a premium aftermarket replacement for selected Cummins 4BT3.3 diesel engines. Designed as a 12V 45A charging alternator, it is manufactured to OEM specifications to provide dependable battery charging and stable electrical output for the starting system, engine controls, lighting, instrumentation and auxiliary electrical components. Built for demanding construction, agricultural and industrial environments, this alternator delivers reliable charging performance while helping minimise machine downtime.
The Cummins 4BT3.3 (B3.3) engine is a robust 3.3-litre four-cylinder industrial diesel widely used in excavators, skid steer loaders, compact wheel loaders, telehandlers, trenchers, generators, compressors and other off-highway equipment. The engine is commonly supplied with a 12V electrical system and a 45A battery-charging alternator, making this replacement ideal for restoring reliable charging performance.
Cross-Reference Part Numbers
390040
Common interchange references include:
- Denso: 101211-2940, 101211-2941, 021080-0980
- Komatsu: 600-861-1610, 600-861-1611
- Cummins: C6008611611 (application dependent)
Compatible Engines
Cummins B Series: B3.3, 4BT3.3, 4B3.3, 4BT3.3-G2, 4BT3.3-G5, 4BTAA3.3.
Compatible Machines
Komatsu Excavators: PC30, PC35, PC40, PC45, PC50, PC60 and other compact excavators fitted with Cummins B3.3 engines.
Komatsu Wheel Loaders: WA30, WA50 and selected compact WA-series models.
JCB Equipment: Selected telehandlers and construction equipment fitted with Cummins B3.3 engines.
Vermeer Equipment: SC852 stump cutters and selected trenchers equipped with Cummins B3.3 engines.
Ahlmann Loaders: AF1050 and AS900 wheel loaders.
Generator Sets: Cummins C25D6, C30D6, C35D6, C40D6 and other generator sets powered by Cummins 4BT3.3 engines.
Industrial Applications: Air compressors, water pumps, agricultural equipment, industrial power units and construction machinery fitted with Cummins B3.3 diesel engines.
Common Symptoms of Failure
Battery warning lamp illuminated, discharged battery, low charging voltage, dim work lights, intermittent electrical faults, slow engine cranking, bearing noise, excessive charging ripple or complete alternator failure.
Fitment Note
Please confirm your existing OEM part number, engine model, alternator mounting configuration, pulley type, electrical connector and output rating before ordering. Cummins B3.3 engines were supplied across numerous equipment manufacturers using different alternator configurations. If you are unsure, contact our technical team with your engine serial number or photographs of your existing alternator and we will verify compatibility before dispatch.
Technical Specifications
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