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The 47400038 Secondary Outdoor Air Filter is a premium intake filtration component engineered for the diesel engines of SINOTRUK Howo heavy‑duty trucks, providing an additional layer of protection to ensure clean, contaminant‑free air for optimal combustion and engine protection. As a trusted supplier of genuine Sinotruk howo parts, we offer this OEM‑grade secondary outdoor air filter as a direct replacement for the original factory unit. The 47400038 secondary outdoor air filter effectively captures fine dust, dirt, and debris that may pass through the primary filter, extending the life of the main filter element and ensuring maximum power and fuel efficiency, even under the most severe operating environments.
Engineered with a high‑capacity pleated cellulose‑synthetic blend media and a robust, corrosion‑resistant housing, the 47400038 secondary outdoor air filter delivers outstanding filtration efficiency, removing particles down to 5 microns while maintaining low intake restriction. Its advanced radial seal design ensures a leak‑proof fit in the air cleaner housing, preventing unfiltered air from bypassing the filter and protecting the engine from abrasive contaminants.
OEM 47400038 • Secondary engine air filtration • 5‑micron efficiency • High‑capacity media • Direct OEM fit
The 47400038 is a premium secondary outdoor air filter designed specifically for the air intake systems of SINOTRUK Howo trucks, including the popular A7, T7H, and mixer chassis, as well as other heavy‑duty models that require this filter specification. This filter serves as a secondary safety element, providing an extra layer of protection in the event that the primary air filter becomes damaged or improperly installed.
The 47400038 secondary outdoor air filter features a high‑capacity, deep‑pleated cellulose‑synthetic blend media that provides excellent filtration efficiency and dirt‑holding capacity. The media is treated with a water‑repellent coating to resist moisture ingress, preventing filter swelling and maintaining airflow even in humid or rainy conditions. Its robust outer casing is constructed from heavy‑gauge steel with a corrosion‑resistant finish, designed to withstand the harsh under‑hood environment.
A heavy‑duty radial seal ensures a positive, leak‑proof fit in the air cleaner housing, preventing unfiltered air from bypassing the filter and entering the engine. This seal is engineered to maintain its integrity under temperature fluctuations and vibration, ensuring consistent protection over the filter’s service life. The secondary element is typically mounted inside the primary filter or in a separate housing, providing backup filtration.
Common symptoms of a clogged secondary air filter are often the same as a clogged primary filter: reduced engine power, increased fuel consumption, black smoke from the exhaust, and a noticeable drop in acceleration. Replacing the filter with the 47400038 restores proper airflow, improves combustion efficiency, and protects the engine from abrasive wear. This OEM‑spec filter is the ideal choice for routine maintenance and engine protection.
Whether you are performing scheduled servicing or addressing performance issues, the 47400038 Secondary Outdoor Air Filter delivers the reliability, filtration performance, and durability that SINOTRUK Howo professionals expect.
The 47400038 secondary outdoor air filter is specifically designed for SINOTRUK Howo trucks equipped with a secondary air filter housing, typically found in models operating in extremely dusty or harsh environments. It is a direct OE replacement and is fully compatible with the factory air filter housing, requiring no modifications for installation.
This filter is essential for applications where engines operate in dusty, sandy, or high‑particulate environments, such as construction sites, mining operations, agricultural fields, and unpaved roads. The secondary filter provides critical backup protection if the primary filter becomes damaged or saturated, preventing engine damage and costly repairs. The 47400038 provides the filtration capacity and efficiency needed to maintain clean air intake and protect the engine.
When replacing the secondary air filter, it is recommended to also inspect the primary filter, air cleaner housing, intake ducting, and seal surfaces for any damage or debris. The 47400038 is designed to work with the factory housing and sealing surfaces, ensuring proper fit and performance.
For fleets with multiple Howo trucks, standardizing on the 47400038 simplifies inventory management and ensures that the correct filter is available for scheduled air filter replacements. Always verify the filter dimensions and housing type on your specific truck to confirm compatibility, though the 47400038 is the standard secondary air filter for most Howo models with this housing size.
Replacing the 47400038 secondary outdoor air filter is a straightforward procedure that can be performed by most technicians using standard hand tools. Begin by locating the air cleaner housing, typically positioned on the side of the engine bay or behind the cab, and open the housing clamps or latches.
Remove the primary air filter first to access the secondary element, which is typically mounted inside the primary filter or in a separate chamber. Carefully remove the old secondary filter, noting its orientation and the position of the radial seal. Use a vacuum or compressed air to clean the inside of the housing, removing any accumulated dust or debris.
Install the new 47400038 filter by sliding it into the housing, ensuring that the radial seal is properly seated against the housing groove. The filter should fit snugly with no gaps. Reinstall the primary filter and secure the housing cover and clamps, making sure the seal is evenly compressed.
For maintenance, replace the secondary air filter at every recommended service interval, typically every 30,000‑40,000 km or whenever the primary filter is replaced. In extremely dusty conditions, more frequent replacement may be necessary. A visual inspection of the filter can indicate if replacement is needed earlier. Never attempt to clean the filter by tapping or using compressed air, as this can damage the media and compromise filtration efficiency. Keep a log of filter changes to track maintenance schedules and ensure consistent engine protection.
The 47400038 secondary outdoor air filter is manufactured in an ISO 9001‑certified facility using advanced pleating, bonding, and sealing technologies. The filter media is sourced from leading global suppliers and is tested for efficiency, airflow resistance, and dust‑holding capacity according to SAE J726 standards. The steel housing is formed from high‑grade cold‑rolled steel and coated with a durable anti‑corrosion layer to withstand the harsh under‑hood environment.
Each filter undergoes rigorous quality control checks, including media integrity testing, filtration efficiency verification, seal integrity testing, and airflow measurement. Random samples from each production batch are subjected to endurance testing on a test rig to simulate real‑world dust loading and vibration conditions, validating long‑term durability and performance.
We back the 47400038 with a comprehensive 12‑month warranty against material and workmanship defects. Our commitment to quality ensures that every filter delivers the same level of protection and performance as the original equipment, giving you confidence in your engine’s air intake system.
Choose genuine secondary air filtration for your Howo – choose the 47400038 Secondary Outdoor Air Filter.
The 47400038 Secondary Outdoor Air Filter is a critical component for protecting your Howo’s engine from the damaging effects of airborne contaminants. A clogged or low‑quality air filter can lead to reduced power, increased fuel consumption, accelerated piston ring and cylinder wear, and costly engine repairs. By choosing this OEM‑spec secondary filter, you ensure that your engine receives clean, filtered air for optimal combustion and long service life.
Engineered with a high‑capacity, efficient media and a robust radial seal, the 47400038 offers outstanding dust capture, low restriction, and reliable sealing, making it ideal for the demanding conditions of heavy‑duty trucking and off‑road operations. Its secondary safety function provides an extra layer of protection, giving you peace of mind in the harshest environments.
Fleet operators benefit from reduced engine wear, improved fuel economy, and lower maintenance costs. Owner‑operators gain peace of mind knowing their engine is protected by a filter that meets strict OEM standards and is backed by a comprehensive warranty.
Invest in the 47400038 and ensure your SINOTRUK Howo’s engine delivers reliable power and efficiency for miles to come.
Order your 47400038 today and keep your engine breathing clean.
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