DEF Doser Urea Pump Assembly for Cummins Diesel Engine 5506956RX 4388105 5506956

DEF Doser Urea Pump Assembly for Cummins

This DEF doser urea pump assembly, referencing OEM part numbers 5506956RX, 4388105, and 5506956, regulates and pumps diesel exhaust fluid into the selective catalytic reduction system.

Overview

The DEF doser urea pump assembly is a critical emission control component that delivers pressurized urea into the exhaust stream. Utilizing this DEF doser urea pump assembly helps reduce harmful nitrogen oxide emissions, keeping your vehicle compliant with environmental regulations. It is designed for commercial truck owners and fleet operators looking to resolve SCR system faults and clear engine derate conditions.

Built For Performance

• High-pressure internal pump delivers consistent fluid volume for efficient SCR dosing.
• Corrosion-resistant internal components resist crystallization and chemical wear from urea.
• Plug-and-play electrical connector matches factory wiring harnesses for quick installation.
• Thermal insulation protects internal electronics from intense exhaust-system heat.

On-The-Job Use

• Maintaining low-emission diesel exhaust standards during long-haul transport.
• Resolving SCR warning lights and active dashboard fault codes.
• Preventing diesel engine derate states caused by DEF system failures.

Specs At A Glance

Good To Know

Q: Why did my original urea pump fail? A: Dried DEF crystallization or debris in the tank are the primary causes of premature pump failure.

Q: Do I need to flush the DEF lines when replacing the pump? A: Flushing the lines with distilled water is highly recommended to remove any crystal build-up before installation.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.