21850647

Description

Overview

21850647 is a DOC used in the diesel oxidation catalyst section of the exhaust aftertreatment system. It is designed for VOLVO/MACK engines and supports oxidation of hydrocarbons and carbon monoxide and heat generation for DPF regeneration in heavy duty service. Volvo supplies heavy duty diesel engines for class 8 highway tractors and vocational trucks. Mack produces heavy duty engines and trucks for construction, refuse, and highway applications in the class 8 segment.

What this part does

This diesel oxidation catalyst promotes oxidation of hydrocarbons and carbon monoxide in the exhaust stream. It also helps generate heat that supports regeneration of the diesel particulate filter downstream.

Where this part fits

This part is generally used on VOLVO/MACK engine platforms installed in class 8 trucks and heavy equipment. Exact fitment depends on the specific engine family, emission level, and chassis configuration.

Installation and replacement notes

• Confirm compatibility with the engine family and emission certification level before ordering.
• Inspect related components for damage or contamination that may have contributed to the original failure.
• Follow OEM torque specifications and service procedures during installation.
• When replacing a DOC it is important to correct any fuel dosing issues, exhaust leaks, or oil carryover that may have contaminated the original catalyst.

Specifications

• Part type: DOC
• OEM or application group: VOLVO/MACK

Related components

During service you may also need clamps, gaskets, sensors, mounting hardware, or additional aftertreatment components depending on the specific installation.