0445120059 Common Rail Injector: Specs, Cummins QSB6.7 Applications & Komatsu PC200-8 Fitment Guide

The Injector 0445120059 is a high-pressure common rail solenoid injector designed for Cummins QSB6.7 engines, with OEM cross-references including Cummins 5263262 and 4945969. It is commonly used in Komatsu PC200-8 excavators, as well as selected commercial trucks and buses.

This guide provides a quick reference covering technical specifications, compatible applications, cross-reference numbers, installation checks, common failure symptoms, and FAQs.

Quick Navigation

  • Technical Specifications
  • Compatible Engines & Equipment
  • Cross-Reference Numbers
  • Installation Checklist
  • Common Symptoms of Injector Failure
  • Warranty & Testing
  • Frequently Asked Questions

1. Technical Specifications

The following values are industry reference specifications for Bosch CRIN2 common rail injectors. Our aftermarket new injectors are manufactured according to these standards.

Bosch Number: 0445120059 / 0 445 120 059

Cummins Cross Reference: 5263262 / 4945969

Injector Type: High-pressure common rail solenoid injector

Nozzle Holes: 6

Static Flow @100 bar: 210–225 ml/1000 strokes

Return Flow @Idle: ≤35 ml/min

Coil Resistance (20°C): 0.2–0.6 Ω

Nozzle Opening Pressure: 255–270 bar

Weight: Approx. 0.8 kg

Place of Manufacture: China

Important Note:

Although some specifications may appear similar to Common Rail Injector 0445120123, these injector models are not directly interchangeable because of different calibration values and engine control parameters. Always use the injector number specified for your machine.

If you need to compare injector models, you may also review our 0445120123 injector guide.

Common Rail Injector 0445120059

2. Compatible Engines & Equipment

Primary Engine

Cummins QSB6.7

Engine type:

  • 6.7L diesel engine
  • 6-cylinder
  • Tier 3 / Stage IIIA applications

Known Equipment Applications

Excavators

  • Komatsu PC200-8
  • Komatsu PC210-8
  • Komatsu PC220-8

Heavy Trucks

  • Dongfeng trucks with QSB6.7 engine
  • Foton trucks with QSB6.7 engine
  • Sinotruk applications

Buses

  • Yutong buses
  • King Long buses

Actual applications may vary by region and engine configuration.

Always confirm using:

  • Engine serial number
  • Original injector number
  • OEM parts catalog

3. Cross-Reference Numbers

Bosch: 0445120059 / 0 445 120 059

Cummins: 5263262 / 4945969

Other references:

Available upon request

Important:

Always compare the original injector label and engine serial number before ordering replacement parts.

4. Installation Checklist (4 Critical Steps)

Many injector problems occur after installation because small procedures are skipped. Follow this checklist carefully.

✓ Replace the Copper Washer

Always install a new sealing washer.

Reusing old washers can lead to:

  • Combustion gas leakage
  • Carbon buildup
  • Poor sealing performance

✓ Clean the Injector Bore

Remove carbon deposits and dirt from the cylinder head injector seat.

The injector should fit naturally without force.

✓ Correct IQA Coding

Enter the injector IQA code into the ECU after installation.

Skipping coding may result in:

  • Rough idle
  • Increased fuel consumption
  • Loss of engine power
  • Irregular fuel correction values

✓ Clean the Fuel System

Contaminated fuel is one of the most common causes of injector failure.

Recommended checks:

  • Replace fuel filters
  • Inspect for water contamination
  • Flush fuel lines if necessary

We provide coding guidance if support is required.

5. Common Symptoms of a Failing Bosch 0445120059 Injector

When a common rail injector begins to wear or malfunction, several symptoms may appear.

Hard Starting

Extended cranking time or difficult cold starts can indicate insufficient fuel delivery.

Black Exhaust Smoke

Poor atomization can create incomplete combustion.

Engine Power Loss

Reduced injector performance may decrease engine output under load.

Rough Idle

Incorrect fuel injection quantity can cause unstable engine operation.

Increased Fuel Consumption

Injector leakage or inaccurate fuel delivery may increase operating costs.

Engine Knocking Noise

Improper spray pattern or delayed injection timing can affect combustion quality.

If these symptoms appear, testing injector return flow and fuel correction values is recommended.

6. Warranty & Testing

  • 6-month warranty against manufacturing defects
  • 100% new parts
  • Not remanufactured
  • Tested using professional common rail test equipment
  • Test reports available upon request

Our injector products are widely used in construction equipment and commercial diesel applications.

Related injector spare parts may include:

  • Injector nozzles
  • Control valves
  • Valve assemblies
  • Injector repair kits

0445120059 Injector FAQs

Can Bosch 0445120059 replace Bosch 0445120123?

No.

Although certain specifications are similar, the injector calibration and engine programming differ. Always follow the original part number.

Do I need IQA coding after installation?

Yes.

Modern common rail systems require coding so the ECU can recognize injector correction values.

How long does a common rail injector usually last?

Service life depends on fuel quality, maintenance intervals, and operating conditions.

Under normal conditions, injectors commonly operate for several thousand working hours before requiring inspection.

Can I replace only one injector?

Yes, if only one injector has failed.

However, if multiple injectors show excessive return flow or similar wear conditions, checking the complete injector set is recommended.

What damages common rail injectors most often?

Common causes include:

  • Dirty fuel
  • Water contamination
  • Poor filtration
  • Incorrect installation
  • Skipped injector coding

Need the Complete Technical Guide?

This article covers the main specifications, applications, installation checks, and troubleshooting information for 0445120059 fuel injectors.

For a complete technical deep-dive including:

✓ Failure analysis
✓ How to select the correct injector model
✓ Real overhaul case studies
✓ Related injector spare parts recommendations

👉 Read our complete article:

0445120059 Common Rail Injector – Full Technical Guide for Komatsu PC200-8 & Cummins QSB6.7

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