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Bosch
0445110777 Bosch CRI2 Common Rail Injector for Kubota D1803 V2403 03-Series
0445110777 Bosch CRI2 Common Rail Injector for Kubota D1803 V2403 03-Series
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Genuine new Bosch 0445110777 common rail diesel injector (Kubota OE 1J801-53052, alternate Bosch reference 0445110505) for Kubota 03-Series common rail diesel engines such as the D1803-CR and V2403-CR. This is a genuine new Bosch unit supplied in the sealed Bosch box, made in Japan, and covered by a 1-year manufacturer warranty. It is an off-highway (OHW) injector for agricultural, compact and industrial Kubota equipment.
A Bosch CRI2 solenoid common rail injector (type formula CRI2-16) restores the correct fuel spray pattern, injection quantity and timing on the listed engines, supporting smooth idle, clean combustion and full rated power. The injector is IMA-coded: it carries an individual injector accuracy code that must be written to the engine ECU after installation so the control unit meters fuel precisely to this exact injector.
Also known internationally as: Common Rail Injector (EN), Common-Rail-Injektor (DE), Injecteur Common Rail (FR), Iniettore Common Rail (IT), Inyector Common Rail (ES), Injector Common Rail (RO) - Bosch 0445110777 for Kubota.
Key features
| Feature | Details |
|---|---|
| Product type | Common rail diesel fuel injector |
| Brand | Genuine Bosch |
| Part number | 0445110777 |
| System / injector family | Bosch CRI2 solenoid common rail injector (type formula CRI2-16) |
| Coding | IMA-coded (individual injector accuracy code written to the ECU after fitting) |
| Application | Kubota 03-Series common rail engines (D1803-CR, V1803-CR, V2403-CR) |
| Usage | Off-highway (agricultural, compact and industrial equipment) |
| Installation type | Direct OEM replacement when part numbers match |
| Quality standard | Bosch OEM manufacturer quality |
| Warranty | 1-year manufacturer global warranty |
Product details
| Product detail | Information |
|---|---|
| Main part number | 0445110777, 0 445 110 777 |
| Alternate Bosch reference | 0445110505, 0 445 110 505 |
| Kubota OE reference | 1J801-53052, 1J80153052 |
| Brand / manufacturer | Genuine Bosch |
| Type formula | CRI2-16 |
| Product category | Common rail diesel fuel injector |
| Condition | Brand-new genuine OEM component (not remanufactured) |
| Country of manufacture | Japan |
| EAN / GTIN | 4047026173697 |
| Included in package | 1 x Bosch common rail injector |
| Not included | Nozzle sealing washer and injector body O-ring (source separately; fitting a new sealing washer is recommended) |
| Weight | 0.50 kg |
| Package dimensions | 25 x 10 x 10 cm |
| Installation area | Engine cylinder head |
OEM cross-reference numbers
Please compare your original part number before ordering. Vehicle or machine model alone is not enough to confirm compatibility.
| Brand / manufacturer | Cross-reference numbers |
|---|---|
| Bosch | 0445110777, 0 445 110 777, 0445110505, 0 445 110 505 |
| Kubota | 1J801-53052, 1J80153052, 1J801-53051, 1J80153051, 1J801-53050, 1J80153050 |
Kubota lists 1J801-53050, 1J801-53051 and 1J801-53052 as IMA calibration-graded numbers for the same physical injector. Identify the correct part by the number printed on your original injector or on the Bosch box, not by the machine model alone.
Vehicle and machine compatibility
Compatibility must always be verified by the original part number, OE reference, engine code or engine serial number. Model alone is not sufficient.
Kubota engines
| Make | Engine family | Displacement | Cylinders | Power | Year | Engine code |
|---|---|---|---|---|---|---|
| Kubota | 03-Series common rail | 1.8 L | 3 | 28 kW | 03/2014 onwards | D1803-CR-E4B |
The same injector is fitted across the Kubota 03-Series common rail engine family, including the three-cylinder D1803-CR and V1803-CR and the four-cylinder V2403-CR. It is commonly found on Kubota tractors (L3301, L3901, L4060, L4701, L5460, L6060, M5660), compact utility machines (MX4800, MX5200, MX5400, MX6000) and excavators (KX040-4, U48-5). Always confirm by the number on the fitted injector or the Bosch box before ordering.
Technical information
| Technical specification | Information |
|---|---|
| Injector type | Bosch CRI2 solenoid (magnetic) common rail injector |
| Type formula | CRI2-16 |
| Coding | IMA-coded; the injector accuracy code is entered into the ECU after installation |
| Fuel system | High-pressure common rail diesel injection |
| Application | Kubota 03-Series common rail off-highway diesel engines |
| Compatibility verification | Part number, OE number or engine serial number required |
Shipping and warranty
| Shipping / warranty detail | Information |
|---|---|
| Shipping | Same-day handling for stock items |
| Pre-order availability | Pre-order items may require 2-4 weeks handling time |
| Warranty | 1-year manufacturer global warranty covering manufacturing defects |
| Returns | Returns accepted only for unused and uninstalled parts in original condition |
| Fitment responsibility | Buyer must verify compatibility before installation |
| Installation damage | Damage caused by incorrect installation, contaminated fuel, or incorrect application is not covered |
Frequently asked questions
| Question | Answer |
|---|---|
| How do I know the Bosch 0445110777 fits my Kubota engine? | Match the number printed on your original injector or Bosch box (0445110777, or Kubota 1J801-53050 / 1J801-53051 / 1J801-53052). It fits the Kubota 03-Series common rail engine family such as the D1803-CR and V2403-CR. If unsure, send us your engine code and serial number and we will confirm. |
| Is it new or remanufactured? | It is a genuine new Bosch injector supplied in the sealed Bosch box, not a remanufactured or exchange unit. |
| What does IMA-coded mean and do I need to program it? | Each injector has an individual injector accuracy (IMA) code. After fitting, that code must be written into the engine ECU with a diagnostic tool so the ECU meters fuel precisely to this injector. This is normal for Bosch common rail injectors. |
| Is 0445110505 the same part as 0445110777? | 0445110505 is listed as an alternate Bosch reference for this Kubota injector. Always confirm against the number on your original injector before ordering. |
| What is the difference between 1J801-53050, 53051 and 53052? | These are Kubota IMA calibration-graded numbers for the same physical injector. This item covers that Kubota injector; the accuracy code is handled during ECU programming after fitting. |
| Does it fit the four-cylinder V2403-CR as well as the three-cylinder D1803-CR? | Yes. The same injector is used across the Kubota 03-Series common rail family, on both the three-cylinder (D1803-CR, V1803-CR) and four-cylinder (V2403-CR) engines. The number of injectors required depends on the cylinder count. |
| Is the nozzle sealing washer included? | No. The nozzle sealing washer and the injector body O-ring are not included and must be sourced separately. Fitting a new sealing washer is recommended. |
| Where is it made and is it genuine Bosch? | It is a genuine Bosch injector made in Japan and supplied in the sealed Bosch box. |
| Do you ship worldwide and how fast? | Yes, we ship worldwide. Stock items are handled the same day. |
Common symptoms of a failing common rail injector
On Kubota 03-Series common rail engines, a worn or leaking injector typically shows as hard or extended cold starting, rough or hunting idle, black or white exhaust smoke, loss of power under load, a knocking or ticking cylinder, or common rail pressure fault codes. Because these engines are IMA-coded, a mismatched or unprogrammed accuracy code can also cause rough running. If in doubt, have the injectors flow-tested and the fuel system professionally diagnosed before replacing parts.
Important diagnostic and installation information
Before fitting, confirm the injector number against your original part, replace the nozzle sealing washer, and program the IMA code into the ECU after installation. If a previous injector failed through fuel contamination, inspect and clean the rail, high-pressure pump, lines and filter before fitting the new injector, as contaminated fuel is the most common cause of repeat common rail failures and is not covered by warranty.
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