Fuel Injector Set 1J770-53050 295050-1980 – Kubota V3307-CR-TE4 OE Interchange

Cross-Reference Verified — Each OEM number mapped against Kubota V3307-CR-TE4 engine serial ranges to confirm port orientation and solenoid connector type before dispatch.

Technical Specifications

Application Suitability

Why the Same Kubota Part Number Ships in Multiple Variants

A Fuel Injector for Kubota V3307-CR-TE4 may carry six different OEM reference numbers, but only one variant matches your specific engine serial range and machine configuration.

I have pulled injectors off a KX080-4 where the part number stamped on the body read 1J770-53050, only to find the replacement ordered under the same number had the fuel return port rotated several degrees off position. The engine cranked, fuel pressure built, but within hours the return line wept at the fitting. The number was correct. The variant was not. Across the Kubota V3307 engine family, production changes between Tier 3 and Tier 4 emissions compliance introduced revisions to the solenoid connector shape, the nozzle spray pattern, and the return-line port clocking. Catalog tables that copy one reference number across all variants without noting these differences cause repeat failures in the field [NEED_CITE: Kubota V3307 engine generation differences in fuel system components]. When sourcing a replacement Fuel Injector for Kubota V3307-CR-TE4, the serial range on the engine plate matters as much as the number on the injector body.

Matching Engine Serial to Injector Body Configuration

The Kubota V3307 family spans several emissions tiers, and the Fuel Injector for Kubota V3307-CR-TE4 Tier 4 engines uses a specific common-rail interface that differs mechanically from earlier non-CR variants. The injector body length, clamp seat geometry, and high-pressure inlet fitting must align with the cylinder head pocket and fuel rail orientation of the target engine build. A KX080-4 produced in an early serial range may use a different injector sub-variant than a KX080-4S rolling off the line later, even though both carry the V3307 designation. Cross-referencing the engine serial number against the injector variant matrix eliminates the most common fitment errors before the package is opened.

Interface Points That Decide Whether It Seals or Leaks

The high-pressure inlet seat, the nozzle tip protrusion length, and the solenoid connector pin layout are the three physical interfaces that determine whether an injector will function in a specific machine. On the SVL75-2 series, the harness connector routes from the rear of the engine bay, which means a solenoid with the wrong clocking orientation will put strain on the wiring loom — causing intermittent signal loss that mimics an ECU fault. On the M7060HDC12 tractor, the injector clamp bolt pattern must match the cylinder head casting precisely; even slight deviation in seat depth changes the combustion chamber geometry and nozzle tip position relative to the piston crown [NEED_CITE: common-rail injector installation tolerance and combustion chamber effects]. Every injector in this set ships with hardened stainless steel nozzle tips finished to ±1 μm orifice tolerance and sealing surfaces held to Ra ≤ 0.2 μm, so the mating surfaces perform as intended once the correct variant is confirmed.

Reading the Specification Sheet Against Your Engine's Demands

The operating pressure rating of up to 160 MPa places these injectors squarely in the high-pressure common-rail category that the V3307-CR-TE4 requires for Tier 4 compliance. At this pressure, the ±2% flow rate tolerance between injectors in a set matters because the ECU expects matched delivery across all cylinders — a single injector flowing outside that band triggers fuel trim corrections that reduce efficiency and increase particulate output. The high-temp polyimide solenoid insulation rated to 180°C handles the thermal environment under the valve cover where ambient and radiant heat combine during sustained high-load operation. The ISO 4406:2017 Class 16/14/11 cleanliness standard means internal surfaces arrive free of the particulate contamination that scores nozzle orifices and accelerates wear in the first hours of service [NEED_CITE: ISO 4406 cleanliness code requirements for diesel fuel injection components]. Fuel efficiency rated at ≤ 210 g/kWh reflects calibrated delivery matching the ECU map for this engine family.

The Cost of Skipping the Variant Check

When an injector arrives with the correct part number but the wrong return port orientation, the technician either forces the connection — creating a leak path that contaminates the engine bay with raw diesel — or sets the machine aside and waits for a replacement. Either outcome extends downtime. On a compact excavator like the KX080-4 working on a tight urban site, a machine sitting idle while a corrected part ships in means lost production days that compound quickly. If the wrong solenoid connector is forced onto the harness, damaged pins can require a full wiring harness section replacement rather than a simple injector swap [NEED_CITE: electrical connector damage from forced mating in mobile equipment]. These downstream costs trace back to a single missed step: confirming the variant against the engine serial before ordering.

What XUNPO Does Differently for Fitment Accuracy

XUNPO maintains cross-reference records covering superseded and alternate numbers, so when an older reference like 295050-1320 appears on a worn injector body, the current equivalent is identified and its physical differences documented. Sample injectors ship for bench fitment confirmation before a buyer commits to a full fleet set — this catches clocking and connector mismatches before bulk inventory lands. The technical team verifies compatibility against machine model and engine serial, not just the stamped number, and both self-produced and sourced lines carry identical QC and warranty terms. One account covers engine parts, hydraulic components, electrical items, and undercarriage across multiple machine brands, so a complete service order consolidates under a single shipment.

Documentation & Verification

• Commercial invoice listing each injector variant with corresponding engine serial range
• Cross-reference sheet mapping 1J770-53050 through 295050-1980 marked as interchange reference only
• Dimensional check record covering return port orientation and solenoid pin layout per unit
• Six-month warranty terms covering manufacturing defects on all injectors in set
• Packing photographs showing individual protective wrap and anti-static foam placement
• HS code and customs documentation prepared for international fuel system component shipments

Fitment Check Before Installation

• Compare return port clocking on new injector against removed unit before seating into cylinder head
• Verify solenoid connector pin count and keyway shape match the machine harness plug exactly
• Measure nozzle tip protrusion against cylinder head specification for the specific V3307 build variant
• Inspect copper crush washer and injector clamp bolt for reuse suitability or replacement need
• Torque injector clamp bolts to Kubota V3307 specification sequence to ensure even seat loading
• Cycle ignition to prime fuel rail and inspect all high-pressure fittings for leaks before starting engine

Requesting a Fitment Confirmation

Send the machine model, engine serial number from the nameplate, and a clear photograph of the existing injector body and solenoid connector. If the nameplate is painted over or worn, a photo of the engine block casting number and the injector mounting area is sufficient for variant identification. This information allows the technical team to return a confirmed fitment answer with the correct cross-reference number before any order is placed.

Frequently Asked Questions

Q: How do I confirm which of the six OEM reference numbers fits my machine? A: Provide your machine model and engine serial number. The reference numbers 1J770-53050, 1J770-53070, 1J770-53074, 1J770-53051, 295050-1980, and 295050-1320 serve for cross-reference identification only. Each corresponds to different engine serial ranges and machine builds within the V3307 family. We match the variant to your specific serial range and confirm return port orientation and solenoid connector type before shipping.

Q: What is the difference between 1J770-53050 and 1J770-53070? A: These reference numbers correspond to different production variants within the Kubota V3307 engine family. Differences may include solenoid connector configuration, return port clocking position, or nozzle spray pattern calibrated to specific ECU mappings. The correct variant depends on your engine serial range and machine model. Physical comparison against the removed injector confirms which variant your engine requires.

Q: How do I verify fitment if my nameplate is worn or painted over? A: Photograph the engine block casting number, the injector body markings, and the solenoid connector area. These details allow identification of the engine variant and corresponding injector configuration even without a readable nameplate. The technical team uses casting marks and connector geometry to narrow down the correct fitment across the KX080-4, SVL75-2, SSV75, and tractor platforms.

Q: Can I get a sample injector to test before ordering a full set? A: Sample units ship for bench fitment verification before bulk commitment. This allows physical comparison of port orientation, connector type, and body dimensions against your existing injectors. Confirming fitment on one unit first prevents the cost and downtime of receiving a full set that requires return or exchange due to a variant mismatch.

Q: Can I use this injector if my machine has a different engine serial range? A: Compatibility depends on matching the injector variant to your specific engine build. Different serial ranges within the V3307 family may use different injector configurations despite sharing a base part number. Submit your engine serial for cross-reference verification. We will confirm whether the variant in stock matches your engine or identify the correct alternative from the reference list.