095000-8480
095000-8480 Denso Kubota V3307 Injector: 1J770-53051 Specs
1J770-53051, 1J770-53050, 1J770-53052, 1J770-53053, 095000-8480, 295050-1980, 295050-0120PlateG3S661800 barProduct Overview
The DENSO 095000-8480 is an original-equipment G3 electro-hydraulic common rail diesel fuel injector manufactured specifically for Kubota V3307-CR-TE4 (3.3-liter, 4-cylinder) and V3800-CR-TE4 (3.8-liter, 4-cylinder) turbocharged direct-injection diesel engines. Engineered to satisfy stringent EPA Tier 4 Final, EU Stage IV, and Stage V industrial non-road emission limits, this injector is the primary fuel metering assembly utilized in Kubota KX080-3T and KX080-4 hydraulic excavators, Kubota SVL75 / SVL75-2 compact track loaders, SSV75 skid steer loaders, Kubota M6060, M7060, M8560, and M9960 utility and agricultural tractors, as well as Bobcat T590, T595, T630, T650 compact track loaders and S590, S595 skid steer loaders. Operating at rail injection pressures up to 1800 bar (26,100 psi) supplied by Denso HP3 / HP4 high-pressure common rail fuel pumps, the injector utilizes a specialized G3S66 micro-hole nozzle coupled with a high-speed hardened Plate #509 electro-hydraulic control valve plate to deliver ultra-precise pilot, pre-, main, and post-combustion injection events. The Denso part number 095000-8480 is fully interchangeable with Denso production numbers 295050-1980, 295050-0120, and Kubota genuine OEM part numbers 1J770-53050, 1J770-53051, 1J770-53052, and 1J770-53053.
CRITICAL WORKSHOP NOTICE: Photograph and record the 30-digit Denso QR calibration code laser-etched onto the electrical connector head BEFORE installing the injector into the cylinder head. The Denso 095000-8480 (Kubota OEM 1J770-53051 / 295050-1980) operates under high hydraulic pressure up to 1800 bar on Kubota V3307 and V3800 Tier 4 Final common rail engines in Bobcat loaders and Kubota excavators. Tighten the injector clamp retaining bolt to 25 N·m (18.4 lb·ft) and the high-pressure fuel pipe nut to 35 N·m (25.8 lb·ft). Entering the 30-digit QR compensation code into the engine ECU using Kubota Diagmaster or Bobcat Service Analyzer software is mandatory to prevent cylinder power imbalances, excessive DPF regeneration cycles, and unburnt fuel smoke.
Vehicle & Engine Fitment
| Vehicle | Engine | Years |
|---|---|---|
| Kubota KX080-3T / KX080-4 Compact Excavator | Kubota V3307 / V3800 (3.3L & 3.8L CR-TE4) | 2011-2022 |
| Kubota SVL75 / SVL75-2 Compact Track Loader | Kubota V3307 / V3800 (3.3L & 3.8L CR-TE4) | 2012-2022 |
| Kubota SSV75 Skid Steer Loader | Kubota V3307 / V3800 (3.3L & 3.8L CR-TE4) | 2015-2023 |
| Kubota M6060 / M7060 Utility Tractor | Kubota V3307 / V3800 (3.3L & 3.8L CR-TE4) | 2012-2022 |
| Kubota M8560 / M9960 Ag Tractor | Kubota V3307 / V3800 (3.3L & 3.8L CR-TE4) | 2012-2021 |
| Bobcat T590 / T595 Compact Track Loader | Kubota V3307 / V3800 (3.3L & 3.8L CR-TE4) | 2012-2020 |
| Bobcat S590 / S595 Skid Steer Loader | Kubota V3307 / V3800 (3.3L & 3.8L CR-TE4) | 2012-2020 |
| Bobcat T630 / T650 Compact Track Loader | Kubota V3307 / V3800 (3.3L & 3.8L CR-TE4) | 2013-2020 |
Technical Specifications
| Specification | Value |
|---|---|
| SKU | 095000-8480 |
| Brand | DENSO / Kubota |
| Type | Complete Common Rail Injector (Denso G3 Series) |
| OE Number | 1J770-53051, 1J770-53050, 1J770-53052, 1J770-53053, 295050-1980 |
| Control ValveCore Spec | |
| Nozzle CodeCore Spec | |
| Internal Nozzle P/NCore Spec | |
| Magnet Assembly | Denso G3 Solenoid Actuator Assembly |
| Seal Ring Kit | 1J770-53620 (1.5mm Copper Sealing Washer) |
| Injection System | Denso Common Rail System (CRS G3 Series) |
| Operating PressureCore Spec | |
| Torque Spec | 35 N·m |
| Hold Down Torque | 25 N·m |
| Warranty | 12 Months |
| Emission Standard | EPA Tier 4 Final / EU Stage IV / Stage V |
| Engine Family | Kubota V3307-CR-TE4 & V3800-CR-TE4 (3.3L & 3.8L) |
| Coding Required | Yes (30-digit Denso QR Code) |
Installation Tips
Tools needed: 17 mm open-end flare nut wrench / crowfoot for high-pressure fuel line nuts, 10 mm & 12 mm hex sockets and calibrated torque wrench (range 5 to 50 N·m), Brass or bronze injector bore cleaning brush kit and workshop vacuum, Injector slide hammer puller (if injectors are carbon-stuck in head), Digital caliper or depth gauge to verify clean copper washer seating surface, Kubota Diagmaster or Bobcat Service Analyzer diagnostic scan tool, High-temperature synthetic ceramic assembly grease (for injector body only, never on nozzle tip)
- Isolate electrical and fuel systems: Turn machine master disconnect key off, disconnect negative battery terminal, and ensure common rail pressure has dissipated below 10 bar before loosening any high-pressure connections.
- Clean cylinder head surrounding area: Thoroughly blow away dirt, gravel, and organic debris around the valve cover and injector wells using compressed air and solvent degreaser.
- Label and disconnect electrical harness and fuel spill line: Carefully unclip each electrical connector from the injector solenoid caps and gently detach the fuel spill return rubber/metal line clips.
- Remove high-pressure fuel lines: Loosen fuel line nuts at the rail and injector inlets using a 17 mm flare nut wrench. Immediately cap all open rail ports and injector inlets with clean plastic caps to prevent microscopic particulate contamination.
- Unbolt hold-down clamp: Remove the injector hold-down clamp retaining bolt and lift off the clamp bracket.
- Extract injector from cylinder head: Gently pull the injector vertically upward. If carbon-bonded, attach a dedicated puller adapter and gently slide-hammer upward without applying rotational twisting force to the injector body.
- Inspect cylinder head bore: Verify that the old copper sealing washer came out with the injector. If remaining in the bore, extract it using a specialized brass washer removal hook without scratching the aluminum/cast seating deck.
- Clean injector seating deck: Clean carbon residues from the injector well and bottom seat using brass brushes and vacuum extraction until clean, flat metal is visible.
- Fit new OEM copper washer: Slide a new 1.5 mm OEM annealed copper washer onto the injector nozzle base. Apply a very thin film of ceramic anti-seize paste to the middle of the injector body, ensuring the nozzle tip, spray holes, and copper washer remain 100% dry and free of grease.
- Insert injector and torque clamp: Lower the injector into the bore in its correct orientation. Install the hold-down clamp and torque the clamp bolt to 25 N·m (18.4 lb·ft).
- Reinstall high-pressure fuel lines: Thread fuel line union nuts by hand first to prevent cross-threading, then torque to 35 N·m (25.8 lb·ft) with a calibrated torque wrench.
- Reconnect return line and harness: Reattach the fuel return spill manifold with fresh O-rings/clips and snap the electrical connectors securely onto the solenoid caps.
- Prime fuel system and bleed air: Operate the machine manual fuel primer pump or electric lift pump until clear, bubble-free diesel fuel flows through the fuel filter and low-pressure circuit.
- Program 30-digit QR compensation code: Connect the diagnostic tool, access the ECM injector calibration menu, enter the recorded 30-digit QR code corresponding to the replaced cylinder, and execute adaptation reset before test starting.
- QR COMPENSATION CODE IS MANDATORY: Always photograph or write down the 30-character QR code before lowering the injector into the head. Entering this code into the ECM is required to balance cylinder fuel delivery.
- NEVER REUSE COPPER SEAT WASHERS: Reused washers will leak combustion gas, causing severe blow-by, melted valve cover seals, and black carbon fouling throughout the injector pocket.
- KEEP COMPONENTS CLEAN: Even a single 5-micron dirt speck entering an un-capped fuel line can permanently score the internal Denso Plate #509 control valve.
- NEVER PRY ON SOLENOID CAP: Apply lifting force only to the forged steel injector body or hold-down notch. Prying against the plastic electrical connector will break the solenoid housing.
Frequently Asked Questions
Does the Denso 095000-8480 / Kubota 1J770-53051 injector require ECU calibration or QR coding?
Yes. Every Denso 095000-8480 common rail injector carries a unique 30-digit alphanumeric QR compensation code laser-engraved onto the upper electrical connector head. This code informs the engine control module (ECM) of the exact manufacturing flow rate deviations across multiple pressure stages (pilot, main, post-injection). You must register this code into the ECM using Kubota Diagmaster or Bobcat Service Analyzer software following replacement. Failure to write the QR code results in uneven cylinder power balance, audible engine knock, elevated soot loading in the Diesel Particulate Filter (DPF), and potential engine limp-mode fault codes.
What are the primary symptoms of injector failure on Kubota V3307 and V3800 engines?
Common symptoms include hard starting or extended cranking when cold or hot, rough engine idle, loss of hydraulic power under load, excessive black exhaust smoke (over-fueling or needle wear), white exhaust smoke at idle (unburnt fuel mist), frequent unprompted DPF active regeneration cycles, and diagnostic trouble codes such as P0087 (Fuel Rail Pressure Too Low), P0088 (Fuel Rail Pressure Too High), or P0201 through P0204 (Injector Circuit Open/Short).
Can I replace just one failed injector on a Bobcat or Kubota machine, or should all injectors be replaced together?
While an isolated single injector can be replaced if failure was caused by mechanical damage or electrical solenoid fault, industry workshop best practice for engines with over 3,000 to 5,000 operating hours strongly recommends replacing or bench-testing the full set of four injectors. Common rail injectors experience identical fuel erosion and thermal cycles. Installing one new injector alongside three worn units frequently induces idle speed hunting and cylinder contribution diagnostic errors due to flow disparity.
Why must the copper combustion sealing washer and clamp bolt be replaced every time?
The copper washer at the injector tip creates the critical high-pressure combustion gas seal between the injector body and the cylinder head deck. During combustion, pressures reach 150+ bar and flame temperatures exceed 1,500°C. Reusing a crushed copper washer results in combustion blow-by, which cooks the fuel inside the injector nozzle, causing severe black carbon buildup ('black death') and seizing the injector body inside the cylinder head bore. Always install a new OEM 1.5mm annealed copper sealing washer and lubricate the clamp bolt threads.
What torque specifications must be followed during installation of the 095000-8480 injector?
Strict adherence to torque values is essential: tighten the injector hold-down clamp bolt to 25 N·m (18.4 lb·ft). Over-torquing the clamp bolt can distort the precision injector body tube and bind the internal control valve plate (Plate #509), causing instantaneous injector failure. Tighten the high-pressure fuel pipe union nuts at both the fuel rail and injector inlet to 35 N·m (25.8 lb·ft) using an open crowfoot torque wrench to ensure zero high-pressure fuel leaks.
Diagnostic Trouble Codes & Fault Protocols
Common diagnostic trouble codes (DTCs) triggered when this common rail injector experiences wear, circuit faults, or calibration drift:
Fuel Rail / System Pressure Too Low
Excessive internal backleak from worn control valve seats drops common rail pressure below target under engine load.
Injector Circuit Malfunction / Open Circuit
Solenoid coil resistance drift (0.2-0.5 Ω) or piezo stack degradation triggers driver stage shutdown on affected cylinders.
Cylinder Misfire & Balancing Deviation
Carbon-clogged nozzle spray holes or missing IMA calibration causes uneven cylinder contribution. Recode ECM and verify washer seating.
Fuel Rail / System Pressure Too High
Spill line backpressure or stuck metering valve prevents rail depressurization, creating overpressure risks under load.
Cross-Reference & Compatibility
Sister parts, same-platform variants, and known incompatibilities.
Technical Diagnostic & Service Protocols
Authoritative field procedures, diagnostic testing thresholds, and service SOPs for this assembly.