Bosch 0445110775 is a new genuine Bosch common-rail injector. It is the same injector Kubota sells as 1J808-53052, in Bosch packaging. It fits the turbocharged, intercooled Kubota D1803-CR-TIE4 and V2403-CR-TIE4 Tier 4 engines, including the engines in the Kubota R430 and R430CA wheel loaders. The D1803 takes 3 and the V2403 takes 4. Caterpillar lists it as 477-7735 and 477-7984.

Common reasons to replace are hard starting, rough idle, smoke, low power and injector fault codes. The easy mistake is Bosch 0445110777 (Kubota 1J801-53052). It looks the same and the Kubota number is one digit off, but it is listed for the D1803-CR-E4, D1803-CR-TE4, V2403-CR-E4 and V2403-CR-TE4 engines used in Kubota L-series and MX-series tractors. Kubota lists them as separate parts for separate engine builds. Do not mix them.

Specifications

Fits / Applications

• Kubota D1803-CR-TIE4 3-cylinder common-rail engine
• Kubota V2403-CR-TIE4 4-cylinder common-rail engine
• Kubota R430 and R430CA wheel loaders

Each injector carries an ID (compensation) code. Kubota’s workshop manual for the D1803-CR and V2403-CR engines, which covers the TIE4 builds, says to register the new injector’s ID code to the engine ECU with Kubota Diagmaster and the DST-i interface, engine stopped and key on. Keep injectors in their own cylinders; if they get mixed up, the codes must be written again. Do not damage the ID code on the injector. Keep the rail and lines capped and clean while they are open.

Part Numbers & Cross Reference

Kubota (current) 1J808-53052  ·  Kubota (earlier) 1J808-53051, 1J808-53050  ·  Caterpillar 477-7735  ·  Caterpillar 477-7984  ·  Lookalike, NOT interchangeable Bosch 0445110777 / Kubota 1J801-53052

Cross-reference numbers can change with engine serial, build year and emissions tier, so treat this list as a starting point. Send us your engine serial number and we will confirm the exact match against your build before anything ships. That check is free and takes a few minutes.

Frequently Asked Questions

Is Bosch 0445110775 the same injector as Kubota 1J808-53052?

Yes. It is a new genuine Bosch injector, the same one Kubota sells as 1J808-53052, in Bosch packaging. Caterpillar lists it as 477-7735 and 477-7984, and no core charge applies.

Can I use 0445110775 in place of Bosch 0445110777?

No. 0445110775 (Kubota 1J808-53052) is for the TIE4 builds, and 0445110777 (Kubota 1J801-53052) is for the D1803-CR-E4, D1803-CR-TE4, V2403-CR-E4 and V2403-CR-TE4. They look the same, but Kubota lists them as separate parts for separate engine builds.

Does a new 0445110775 have to be coded to the ECU?

Yes. Each injector carries an ID code, and Kubota’s workshop manual says to register the new injector’s code to the engine ECU with Kubota Diagmaster and the DST-i interface. Keep injectors in their own cylinders, because if they get mixed up the codes must be written again.

How do I know my D1803-CR or V2403-CR is a TIE4 build?

These engines come as E4, TE4 and TIE4 builds, and 0445110775 is for the TIE4 builds, including the engines in the Kubota R430 and R430CA wheel loaders. Send us the full engine model and serial number, or the Kubota number on your old injector. We confirm the match at no charge before anything ships.

Related Parts

• Kubota V2403 D1803 Fuel Injector 1J808-53052 (Genuine)
• Kubota D1803-CR & V2403-CR Common-Rail Fuel Injector | Bosch 0445110777 New (Kubota 1J801-53052)
• Kubota D1803-CR & V2403-CR Mechanical Fuel Feed Pump (KX040-4, U48-5) | Genuine Kubota 1J801-52030
• Kubota D1803-CR & V2403-CR No. 1 Cylinder Common-Rail Injection Pipe | Genuine Kubota 1J800-53710

Why Buy From Valley Fuel Injection

We are an authorized Kubota dealer and a diesel fuel-injection shop in Woodland, CA, working on diesel engines since 1993. When you call, you talk to people who know Kubota engines and can help you match the part number to your engine serial or machine model before you order. See our Kubota engine sales, parts and service.