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Bosch
0445110777 Bosch CRI2 Common Rail Injector Set of 3 for Kubota D1803 3-Cylinder
0445110777 Bosch CRI2 Common Rail Injector Set of 3 for Kubota D1803 3-Cylinder
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Genuine new Bosch 0445110777 common rail injector set of 3 (Kubota OE 1J801-53052, alternate Bosch reference 0445110505) - a complete injector set for Kubota 03-Series three-cylinder common rail diesel engines such as the D1803-CR and V1803-CR. The set contains three genuine new Bosch injectors, each supplied in its sealed Bosch box, made in Japan, and covered by a 1-year manufacturer warranty. These are off-highway (OHW) injectors for agricultural, compact and industrial Kubota equipment.
A three-cylinder engine uses three injectors, so this set covers a full injector replacement in one order. Each Bosch CRI2 solenoid common rail injector (type formula CRI2-16) restores the correct fuel spray pattern, injection quantity and timing, supporting smooth idle, clean combustion and full rated power. Every injector is IMA-coded: each carries an individual injector accuracy code that must be written to the engine ECU after installation so the control unit meters fuel precisely to that 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, set of 3.
Key features
| Feature | Details |
|---|---|
| Product type | Common rail diesel fuel injector set (3 pieces) |
| Brand | Genuine Bosch |
| Part number | 0445110777 (x3) |
| Set quantity | 3 injectors - complete set for a three-cylinder engine |
| System / injector family | Bosch CRI2 solenoid common rail injector (type formula CRI2-16) |
| Coding | IMA-coded (each injector accuracy code written to the ECU after fitting) |
| Application | Kubota 03-Series three-cylinder common rail engines (D1803-CR, V1803-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 set |
| Condition | Brand-new genuine OEM components (not remanufactured) |
| Country of manufacture | Japan |
| EAN / GTIN per injector | 4047026173697 |
| Included in package | 3 x Bosch 0445110777 common rail injectors, each in its sealed Bosch box |
| Not included | Nozzle sealing washers and injector body O-rings (source separately; fitting new sealing washers is recommended) |
| Set weight | 1.50 kg |
| Package dimensions | 30 x 20 x 20 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. This set of 3 is intended for three-cylinder engines only.
Kubota engines (three-cylinder)
| 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 |
| Kubota | 03-Series common rail | 1.8 L | 3 | - | - | V1803-CR |
This 3-piece set fits the three-cylinder members of the Kubota 03-Series common rail engine family (D1803-CR and V1803-CR). For the four-cylinder V2403-CR engine you need the set of 4. 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 |
| Set quantity | 3 injectors (one full set for a three-cylinder engine) |
| Coding | IMA-coded; each injector accuracy code is entered into the ECU after installation |
| Fuel system | High-pressure common rail diesel injection |
| Application | Kubota 03-Series three-cylinder 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 many injectors are in this set? | Three genuine new Bosch 0445110777 injectors, each in its own sealed Bosch box - a complete set for a three-cylinder engine. |
| Which engine is this set for? | The three-cylinder Kubota 03-Series common rail engines, such as the D1803-CR and V1803-CR. For the four-cylinder V2403-CR you need the set of 4. |
| Why buy the set instead of single injectors? | Common rail specialists recommend replacing all injectors on an engine together, so wear is even and the ECU can be re-coded in one job. The set price is lower than buying the injectors individually. |
| Are they new or remanufactured? | Genuine new Bosch injectors supplied in sealed Bosch boxes, not remanufactured or exchange units. |
| What does IMA-coded mean and do I need to program it? | Each injector has an individual injector accuracy (IMA) code. After fitting, each code must be written into the engine ECU with a diagnostic tool so the ECU meters fuel precisely to that injector. This is normal for Bosch common rail injectors. |
| How do I know these fit my Kubota engine? | Match the number on your original injectors or Bosch box (0445110777, or Kubota 1J801-53050 / 1J801-53051 / 1J801-53052) and confirm your engine is a three-cylinder 03-Series common rail unit. If unsure, send us your engine code and serial number and we will confirm. |
| Are the sealing washers included? | No. The nozzle sealing washers and injector body O-rings are not included and must be sourced separately. Fitting new sealing washers is recommended. |
| Where are they made and are they genuine Bosch? | They are genuine Bosch injectors made in Japan and supplied in sealed Bosch boxes. |
| Do you ship worldwide and how fast? | Yes, we ship worldwide. Stock items are handled the same day. |
Common symptoms of failing common rail injectors
On Kubota 03-Series common rail engines, worn or leaking injectors typically show 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. When one injector fails, replacing the full set keeps injection balanced across all cylinders. 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 parts, replace the nozzle sealing washers, and program each 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 injectors, as contaminated fuel is the most common cause of repeat common rail failures and is not covered by warranty.
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