Fuel Injector 4928260 for Cummins QSX15 ISX15 R800LC-9 – Cross-Reference

Variant Fitment Verified — each 4928260 fuel injector ships with serial-range confirmation for Hyundai R800LC and Cummins QSX15/ISX15 engines

Technical Specifications

Application Suitability

Why Identical Part Numbers Lead to Fitment Failures on Site

Superseded numbers and hidden variants mean the right number does not always mean the right part.

In Guangzhou warehouse operations over the years, the most frustrating call comes from a site supervisor holding a new Fuel Injector 4928260 that physically will not seat in the cylinder head of a Hyundai R800LC-9. The part number matches. The box label matches. But the fuel port angle differs by a critical margin between early and late production runs of the QSX15 CM570 engine. This is not a rare event. Cross-reference tables copied between sellers carry forward errors from superseded numbers, and a single wrong injector delivered to a remote quarry means the excavator sits idle while a replacement ships [NEED_CITE: aftermarket cross-reference verification practices for heavy equipment fuel systems].

The 4928260 family includes variants designated 4928260PX and 4928260RX, each corresponding to different production phases and calibration requirements. An R800LC-7A from an earlier production batch may require a different nozzle protrusion dimension than an R800LC-9, even though the base number appears identical in generic catalogs. Identifying the correct Fuel Injector 4928260 variant demands checking the engine serial range, not just the machine model plate.

Machine Serial Range Determines the Correct Variant

The base designation 4928260 covers fuel injectors fitted across multiple Hyundai R800LC series machines and Cummins ISX/QSX engine generations. However, the physical interface—specifically the fuel inlet port position and the solenoid connector type—shifted between production runs. For an R800LC-9 equipped with a QSX15 CM570, the engine serial number narrows the field to one correct variant. Without that serial, you are ordering on probability rather than certainty. Our verification process matches each Fuel Injector 4928260 order against the specific engine build record before dispatch.

Port Orientation and Connector Verification Before Dispatch

The difference between a correct fit and a 90-degree port misalignment often comes down to a single suffix in the engine serial. On the R800LC-7A versus the R800LC-9, the fuel rail geometry changed, meaning the injector inlet port must align within a narrow angular tolerance. Similarly, the electrical connector on ISX15 CM2250 engines uses a different pin configuration than the older ISX CM570. Before any injector leaves the Guangzhou warehouse, we confirm the port clocking angle, solenoid connector type, and nozzle body length against the buyer's engine serial or a photograph of the removed unit [NEED_CITE: fuel injector interface compatibility standards for off-highway diesel engines].

Decoding the Calibration and Delivery Rate Differences

Each injector in the 4928260 family delivers fuel at a rate calibrated to its specific engine variant. The nozzle orifice diameter, spray cone angle, and solenoid response timing work as a matched set with the engine control module parameters. An ISX15 CM2250 requires a different calibration code than a QSX15 CM570, and fitting the wrong variant results in rough idle, elevated exhaust temperatures, or cylinder washing. The internal solenoid specifications and precision-machined nozzle are manufactured under ISO-certified processes to match the fuel delivery profile the engine ECU expects, not merely the flow volume a generic listing claims.

The Cost of Installing a Near-Match

Fitting a fuel injector that seats physically but carries the wrong calibration code or port orientation does not always trigger an immediate fault code. More often, the engine runs with slightly degraded combustion in one cylinder, leading to soot buildup on the piston crown and gradual erosion of the exhaust valve face. Over weeks of operation in a mining or quarry application, this localized damage spreads to adjacent components. The injector itself may survive, but the cylinder head comes off anyway for a repair that costs far more in labor and downtime than a verified replacement would have [NEED_CITE: diesel injector mismatch effects on cylinder component wear].

Why Procurement Through This Channel Works

Selected injector lines are produced in our own facility, with remaining variants sourced from qualified ISO-certified manufacturing partners—both carry the same quality control and 12-month warranty terms. A single account covers all eight product categories, so if a fuel system overhaul also requires filters, seal kits, or rail fittings, everything ships as one consignment. Minimum order starts from one piece, which matters when a single R800LC-9 is down on site. Part identification works from the part number, machine model, a photograph of the nameplate, or an image of the removed injector. Cross-reference verification covers superseded numbers including 4928260PX and 4928260RX. Sample units are available for fitment confirmation before a buyer commits to a full engine set.

Documentation & Verification

• Commercial invoice listing each injector variant by confirmed engine serial match
• Cross-reference sheet mapping 4928260, 4928260PX, and 4928260RX with serial range notes (reference only)
• Dimensional inspection record covering nozzle protrusion, port angle, and connector pin layout
• 12-month warranty terms against manufacturing defects included with each unit
• Packing photographs showing individual injector protection and labeling before crate closure
• HS code and customs documentation support for international fuel system component shipments

Fitment Check Before Installation

• Compare the old injector body length and nozzle tip protrusion against the new unit before insertion
• Verify fuel inlet port clocking angle matches the fuel rail orientation on your specific R800LC variant
• Confirm solenoid connector pin count and shape match the engine harness plug exactly
• Check the nozzle seating surface in the cylinder head for carbon deposits that prevent proper seal
• Torque the injector clamp bolt to the engine manufacturer specification to avoid nozzle distortion

Getting the Right Part Confirmed

Send the machine model plate photograph, the engine serial number from the Cummins dataplate, or a clear image of the removed injector showing the port and connector. We cross-reference the build record to confirm which 4928260 variant fits your specific machine and return a fitment verification before any order is processed. For fleet buyers running mixed Hyundai and Cummins-powered equipment, provide the full machine list so we can map each unit to its correct injector variant in one pass.

Frequently Asked Questions

Q: How do I confirm this injector fits my specific Hyundai R800LC or Cummins engine variant? A: Provide the engine serial number from the Cummins dataplate or the full machine serial from the Hyundai identification plate. We cross-reference the production build record to confirm which variant of the 4928260 family matches your engine, checking port orientation, connector type, and calibration code before confirming fitment.

Q: What is the difference between 4928260, 4928260PX, and 4928260RX — which one do I need? A: These designations correspond to different production phases and calibration requirements within the same injector family. The correct variant depends on your engine serial range and the specific ECU calibration your machine requires. We verify the match against the engine build record rather than relying on generic interchange tables.

Q: My original part number has been superseded — is this injector still the correct replacement? A: Superseded numbers are common across Cummins ISX and QSX engine generations. We maintain cross-reference records covering the supersession path from earlier numbers through to the current designation. Provide your original number and engine serial so we can confirm whether the current variant covers your application.

Q: I only have my machine model, not the part number — can you verify fitment? A: Yes. The machine model alone, such as R800LC-9 or R800LC-7A, gives us a starting point. We then narrow the field using the machine serial number or engine serial to identify the exact injector variant. A photograph of the nameplate or the removed injector speeds up confirmation significantly.

Q: Can I order a sample to confirm fitment before committing to a full set? A: Sample units are available for fitment verification. This is standard practice for buyers replacing a full set of injectors across a multi-cylinder engine. Fit one sample, confirm the port alignment and connector match, then release the balance of the order with confidence.