The 24V DEF Injection Urea Dosing Pump A050S572 / 4377649 for Cummins Engines is a critical aftertreatment system component designed to precisely deliver Diesel Exhaust Fluid (DEF) into the exhaust stream for effective SCR (Selective Catalytic Reduction) operation. Engineered to meet OEM specifications, this dosing pump ensures accurate DEF flow, helping reduce NOx emissions and maintain emissions compliance.
Designed specifically for Cummins QSB and B6.7 engines, this 24-volt DEF dosing pump is manufactured using high-quality internal components, corrosion-resistant materials, and a sealed housing to withstand harsh operating environments, vibration, temperature extremes, and continuous duty cycles.
A failing DEF dosing pump can cause poor DEF injection, warning lights, derate conditions, or emissions fault codes. Replacing it with this Cummins DEF urea dosing pump restores proper aftertreatment function, improves system reliability, and helps prevent costly downtime.
This pump is ideal for emissions system repairs, routine maintenance, fleet servicing, and replacement during SCR system diagnostics in on-highway, off-highway, and industrial Cummins applications.
✔ PRODUCT FEATURES & COMPONENTS
-
24V DEF / urea injection dosing pump
-
Replaces Cummins part number 4377649
-
Replaces OEM reference A050S572
-
Precision-controlled DEF delivery
-
Designed for SCR emissions systems
-
Corrosion-resistant internal components
-
Durable sealed housing for harsh environments
-
Direct-fit replacement — no modification required
✅ ENGINE COMPATIBILITY
-
Cummins QSB
-
Cummins B6.7
✅ VEHICLE & EQUIPMENT APPLICATIONS
-
Commercial trucks and buses
-
Construction and industrial machinery
-
Agricultural equipment
-
Generator sets
-
Off-highway and vocational vehicles
-
Fleet vehicles with Cummins QSB and B6.7 engines
✅ KEY FEATURES & BENEFITS
-
Ensures accurate DEF injection for SCR efficiency
-
Helps reduce NOx emissions
-
Prevents derate and emissions fault codes
-
Supports compliance with emissions regulations
-
Improves aftertreatment system reliability
-
OEM-grade durability and performance
What does a DEF dosing pump do on a Cummins engine?
A DEF dosing pump delivers diesel exhaust fluid into the exhaust stream to support SCR operation and reduce NOx emissions.
Which engines use DEF dosing pump 4377649?
This DEF dosing pump is compatible with Cummins QSB and B6.7 diesel engines.
What voltage does this DEF pump operate on?
This DEF dosing pump operates on a 24-volt electrical system.
Is this a direct replacement DEF pump?
Yes, it is a direct-fit replacement manufactured to OEM specifications for compatible Cummins engines.
