The Cummins 24V Urea DEF Injector Doser Pump 4377650 is a critical SCR emissions component engineered to deliver precise Diesel Exhaust Fluid (DEF) dosing into the exhaust system. Designed for Cummins B6.7, ISL9, QSB6.7, X12, and X15 engines, this doser pump ensures proper urea atomization for effective NOx reduction and emissions compliance.
Manufactured to OEM specifications, the 4377650 DEF injector doser pump maintains consistent DEF flow under high exhaust temperatures, vibration, and demanding operating conditions. Accurate dosing is essential to SCR catalyst performance, and this unit ensures efficient chemical conversion of harmful nitrogen oxides into harmless nitrogen and water vapor.
A failing DEF doser pump can cause SCR faults, check engine warnings, power derate, and emissions non-compliance. Replacing it with the Cummins 4377650 24V DEF injector doser pump restores correct SCR operation, protects exhaust aftertreatment components, and helps maintain optimal engine performance. It is ideal for fleet maintenance, emissions system repair, and preventive servicing of modern Cummins diesel engines.
✔ PRODUCT FEATURES & COMPONENTS
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OEM-quality 24V Urea DEF Injector / Doser Pump
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Cummins part number: 4377650
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Precision DEF metering for SCR systems
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Supports efficient NOx reduction
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High-temperature and corrosion-resistant construction
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Stable DEF atomization and injection
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Direct-fit replacement, no modification required
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Designed for heavy-duty diesel emissions systems
✅ ENGINE COMPATIBILITY
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Cummins B6.7
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Cummins ISL9
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Cummins QSB6.7
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Cummins X12
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Cummins X15
✅ VEHICLE & EQUIPMENT APPLICATIONS
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Heavy-duty trucks and buses
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Construction and mining equipment
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Agricultural machinery
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Industrial diesel engines
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Fleet vehicles with SCR emissions systems
✅ KEY FEATURES & BENEFITS
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Accurate DEF dosing for SCR efficiency
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Helps prevent engine derate and fault codes
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Maintains emissions compliance
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OEM-grade reliability and durability
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Protects SCR catalyst and exhaust components
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Designed for long service life in harsh environments
What engines use Cummins DEF injector doser pump 4377650?
Cummins DEF injector 4377650 fits B6.7, ISL9, QSB6.7, X12, and X15 diesel engines equipped with SCR systems.
What does a DEF injector doser pump do?
It injects precise amounts of Diesel Exhaust Fluid into the exhaust stream to allow the SCR system to reduce NOx emissions.
Is this a 24-volt DEF injector?
Yes, this DEF injector doser pump operates on a 24V electrical system.
What happens if the DEF doser pump fails?
A failed DEF doser can cause SCR faults, check engine lights, engine derate, and emissions non-compliance.
Is Cummins 4377650 an OEM-quality replacement?
Yes, Cummins 4377650 meets OEM specifications for fit, performance, and emissions system reliability.
