Alternator JFZ2710F 24V 70A 8PK Cummins 6BT 6CT
Applicable models:Cummins 6BT and 6CT engine electrical generator applications (verify engine model, engine code and OE number before ordering)
Reference part number: JFZ2710F, JFZ2710, JFZ2710F1, EE9324, 4939018, C3972529, C3979372, C4942002, C4934903, 60034222, 10775100, ATG20286, 3415609
| Rated output : | 24V 70A |
| Pulley : | 8PK |
| Size : | 24*18*17single unit inner box |
| Weight : | net weight：7.25KG gross weight：7.70KG |
| Packaging : | Neutral kraft paper packaging |
| Spot/Pre sale : | Spot goods |
| Warranty : | 1 year |
| Product number : |
| Type : | Altemator |
| Specification : | 24V 70A |
| Pulley : | 8PK |
| Brand : | nuojin |
| Number : | JFZ2710F EE9324 |
| Quality : | new |
| Delivery time : | 10 day |
Product Overview
The JFZ2710F is a brand-new alternator delivering 24V output at 70A with an 8PK pulley, engineered for Cummins 6BT and 6CT engine electrical generator applications. This unit, cross-numbered as 4939018, C3979372 and C3972529, matches the original charging-system specification for the Cummins engine platform.
This alternator is stocked in-house with a 1-year warranty and 10-day dispatch lead-time. The factory-correct 24V 70A specification ensures reliable charging performance for Cummins 6BT and 6CT applications.
Key physical specs: net weight 7.25 kg, gross weight 7.70 kg, overall dimensions 240 x 180 x 170 mm, supplied inside neutral kraft inner carton.
The Cummins 6BT/6CT Charging Platform
Cummins 6BT and 6CT engine electrical generator applications use a 24V charging system with 70A alternators. The alternator numbering spans the JFZ series (JFZ2710F, JFZ2710, JFZ2710F1), the C-prefixed Cummins numbers (C3972529, C3979372, C4942002, C4934903), and a group of other OEM and cross numbers (EE9324, 4939018, 60034222, 10775100, ATG20286, 3415609), all referring to the same charging-system family for the Cummins engine platform.
It is critical to verify the output voltage, current rating and pulley type on your old alternator: this unit is rated at 24V 70A with an 8PK pulley. Alternators with a different output voltage, current rating, pulley configuration or mounting pattern are not interchangeable with this unit. The 8PK pulley and the JFZ2710F family number are key identification points for this unit, so check the pulley belt type and the OE numbers stamped on your old alternator carefully.
Confirm the mounting bracket, terminal positions and connector configuration against your original alternator before ordering. Always cross-check the OE numbers stamped on your old unit, including the JFZ2710F family, before placing an order.
Technical Specifications
| Parameter | Specification |
|---|---|
| Main part number (JFZ series) | JFZ2710F |
| JFZ series variants | JFZ2710, JFZ2710F1 |
| C-prefixed Cummins numbers | C3972529, C3979372, C4942002, C4934903 |
| Other OEM and cross numbers | EE9324, 4939018, 60034222, 10775100, ATG20286, 3415609 |
| Rated output | 24V 70A |
| Pulley | 8PK |
| Engines | Cummins 6BT, 6CT |
| Application | Electrical generator |
| Quality | NEW |
| Warranty | 1 year |
| Net Weight | 7.25kg |
| Gross Weight | 7.70kg |
| Dimensions | 240 x 180 x 170mm |
| Lead Time | 10 days, in stock |
Compatibility and Cross Reference
According to the original product page, this alternator fits Cummins 6BT and 6CT engine electrical generator applications. The original page does not publish a detailed fitment table, so do not rely on the engine name alone for fitment validation; always compare the original part number, mounting holes, pulley type and connector configuration before ordering.
| Brand | Application | Notes |
|---|---|---|
| Cummins | 6BT engine | Verify 24V 70A 8PK |
| Cummins | 6CT engine | Verify 24V 70A 8PK |
Multiple OEM and cross numbers appear across production batches and regional market specifications for this same alternator family. If your original unit bears one of the listed cross-reference numbers, JFZ2710F serves as a direct drop-in replacement.
What to Look for in a Replacement
Follow these five verification steps before placing your order to avoid wrong-part returns:
1. Check the output voltage and current rating on your old alternator: confirm it is a 24V 70A unit. Other ratings are not interchangeable.
2. Check the pulley belt type on your old alternator: confirm it is an 8PK pulley. Alternators with a different pulley configuration are not interchangeable.
3. Confirm the application is a Cummins 6BT or 6CT engine. Other engines may use different alternator assemblies.
4. Compare the mounting bracket, terminal positions and connector configuration with your original alternator, and match OE numbers including the JFZ2710F family.
5. Weight cross-check: genuine matching unit weighs approximately 7.25 kg net; significant weight difference indicates wrong assembly.
Application Scenarios
Engine repair shops servicing Cummins 6BT/6CT engines with failed charging systems.
Generator-set service teams replacing worn 24V alternators on electrical generators.
Fleet maintenance teams for trucks powered by Cummins 6BT/6CT engines replacing worn alternators.
Auto parts retailers and distributors stocking Cummins engine alternators for the aftermarket.
Exporters supplying American heavy-duty engine alternators to global markets.
FAQ
Q: Which engines does this alternator fit?
A: It fits Cummins 6BT and 6CT engine electrical generator applications. Confirm your exact engine model, year and OE number before ordering, and check that your old alternator is a 24V 70A 8PK unit.
Q: My old alternator shows number 4939018 or C3979372, will JFZ2710F work?
A: Yes. These numbers belong to the same alternator family for the Cummins 6BT/6CT platform, differing only by production revision and market specification. It serves as a direct replacement.
Q: What does EE9324 mean?
A: EE9324 is an additional cross number listed in the original Details page for this alternator family, recorded here alongside the main number JFZ2710F.
Q: Why are there both C-prefixed and non-prefixed numbers?
A: Numbers such as C3972529, C3979372, C4942002 and C4934903 are the C-prefixed Cummins formats of the same OEM numbers (3972529, 3979372, 4942002, 4939018), differing only by marking format across production batches. Both forms refer to the same alternator family.
Q: What is the correct charging voltage after installation?
A: A healthy 24V charging system should regulate at approximately 27-29V at the battery terminals with the engine running. If the voltage is out of range, check the alternator, regulator and wiring before further testing.
Q: What is your warranty and lead-time?
A: Goods are in stock with a 10-day dispatch lead-time. A 1-year warranty applies from installation date; warranty excludes damage caused by mis-installation, incorrect wiring, water ingress, short circuit or physical damage.
In Practice
The original product page does not publish a specific installation method or torque data for this alternator. The following section therefore uses the general 24V engine alternator installation standard, with reference to the common installation practice for Cummins 6BT/6CT alternators and after-sales maintenance experience from the auto repair industry; before installation, compare the specific torque values with the corresponding Cummins service manual.
Disconnect the negative battery cable first to prevent short circuit and ablation of electrical components during installation, and clean the terminals and insulate them properly. Park the machine on a flat and hard surface, apply the parking brake, and chock the wheels. Remove the fan shroud and any drive-belt covers as required to expose the alternator installation position. Clean the alternator mounting surfaces and the tensioner bracket fixing holes, and treat rust and oil stains with rust remover. Confirm the new alternator is the 24V 70A 8PK type, and inspect that the rotor turns freely, the pulley fits the 8PK belt correctly, and the housing has no cracks.
Fit the alternator onto the mounting bracket, align the fixing holes and insert the bolts by hand as pre-tightening, then tighten with a torque wrench following the diagonal tightening principle; for 24V engine alternators, a typical reference torque for the main mounting bolts is 25-35 N.m and for the tensioner adjuster bolts 20-30 N.m, to be fine-tuned with reference to the corresponding Cummins model manual. Fit the 8PK drive belt over the alternator pulley, crankshaft pulley and any driven pulleys, and tension the belt to the manufacturer specification; a belt that is too loose will slip under load and a belt that is too tight will damage the alternator bearing.
Connect the wiring in the sequence of low-voltage first, high-voltage second: connect the small excitation/control terminal (marked L or D+) to the warning-lamp or regulator control wire; connect the battery positive output cable to the main B+ terminal and tighten the nut securely, ensuring the cable lug is closely attached with no gap. Ensure the alternator housing is grounded through the mounting bracket, free of rust and oil stains. Secure the wire harnesses to avoid contact with hot exhaust components and moving parts, reinstall the fan shroud and belt covers, reconnect the negative battery cable, and check that all connections are tight.
After installation, start the engine and check that the battery warning lamp goes out and that the charging voltage settles at approximately 27-29V at 1500 rpm and above. Verify that the belt does not squeal under load. If the charging voltage is out of range, check the belt tension, the wiring connections and the regulator before further testing. Never run the alternator with the battery disconnected, as this can damage the regulator.
References
This content is compiled by integrating information from multiple sources and does not have a specific single official source. The original product page does not publish a specific installation method or official torque data for this alternator. The installation method and torque reference values in this article are summarized and integrated based on the universal installation standards for 24V engine alternators, the common installation practice for Cummins 6BT/6CT alternators, and practical experience from the mainstream auto repair industry, verified against actual installation tests and after-sales maintenance experience; for vehicle-specific torque values, please refer to the corresponding Cummins service manual.
