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How to Choose the Right Air Filter for a Diesel Generator
Choosing the right air filter for a diesel generator is not just about brand names or price.
For generator owners, maintenance teams, importers, distributors, and wholesalers, selecting the correct air filter ensures stable engine performance, lower maintenance costs, and long service life.
As a China-based air filter manufacturer and OEM supplier for diesel generator engines, we often help customers identify the correct air filter even when part numbers are missing or unclear.
This guide explains practical, real-world methods to choose the right air filter for your diesel generator.
Choose the Air Filter Based on the Installed Filter Part Number
The most direct and accurate way to select the correct air filter is to check the part number installed on the generator.
Most diesel generators from brands such as Cummins, Perkins, Caterpillar, Volvo, MTU, and John Deere use standardized air filter part numbers. These numbers are usually printed on the outer shell or end cap of the air filter.
If the part number is visible, simply provide it to us.
Our factory can quickly cross-check it with OEM specifications and confirm the correct replacement air filter.
Identify the Air Filter by Photos and Dimensions When No Part Number Is Available
In many cases, especially with older generators or customized equipment, the air filter may not have a readable part number.
In this situation, you can remove the old air filter from the machine and:
Take clear photos of the air filter from multiple angles
Measure the outside diameter (OD)
Measure the inside diameter (ID)
Measure the overall height
Once you send us the photos and dimensions, our technical team can match these details with our database and identify the correct air filter model.
This method is commonly used by customers sourcing custom, OEM, ODM, or private label air filters for bulk or wholesale orders.
Cross-Check Small Factory Part Numbers Printed on the Air Filter
Some air filters are produced by small factories and may carry non-mainstream or internal factory part numbers rather than OEM numbers.
If you see unfamiliar part numbers printed on the old air filter, do not worry.
You can:
Take photos of the part number printed on the air filter
Send the photos to us
We can cross-reference these numbers and verify the correct OEM equivalent part number, ensuring compatibility with your diesel generator engine.
This approach is especially useful for traders, sourcing agencies, and distributors who handle multiple brands and mixed inventories.
Identify the Correct Air Filter Using the Engine Nameplate
Another reliable method is to provide the engine nameplate information.
The engine nameplate typically includes:
Engine model
Serial number
Power rating
By sharing clear photos of the engine nameplate, we can determine the correct air filter required for that specific diesel generator engine.
This method is widely used when sourcing air filters for:
Генераторные установки
Construction equipment
Промышленные двигатели
Who This Guide Is For
This guide is designed for:
Importers and exporters
Wholesalers and distributors
Dealers and sourcing agencies
Companies looking for OEM, ODM, private label, or white label air filters
Customers sourcing air filters directly from manufacturers and factories in China
Why Work Directly With an Air Filter Manufacturer
Working directly with a professional air filter manufacturer offers several advantages:
Accurate OEM cross-referencing
Custom size and private label support
Stable quality control from in-house manufacturing
Competitive pricing for bulk and wholesale orders
Reliable export and international shipping services
As a dedicated diesel engine air filter factory, we support global partners with long-term sourcing solutions rather than one-time transactions.
Cummins diesel generator air filters
Perkins generator air filter replacements
Caterpillar metal frame air filters
Diesel generator air filter cross reference guide
Choosing the right air filter for a diesel generator does not have to be complicated.
With the correct part number, dimensions, photos, or engine nameplate information, the right solution can always be identified.
If you are sourcing air filters for resale, bulk import, or long-term supply, working with an experienced manufacturer ensures both performance and cost efficiency.

How to Maintain CAT 3500 Series Diesel & Gas Gensets: Air Filter Selection & Replacement Guide
Learn how to select and replace air filters for CAT 3500 series diesel and gas gensets to protect engines, reduce downtime, and ensure reliable long-term operation.

Зачем дизельным двигателям нужен воздушный фильтр
Дизельные двигатели полагаются на воздушные фильтры, которые обеспечивают их оптимальную производительность и долговечность, предотвращая попадание в систему сгорания загрязняющих частиц, таких как пыль, грязь и другие твердые частицы.

Руководство по быстрому выбору лучшего воздушного фильтра для дизельного двигателя
Для дизельных двигателей, особенно для внедорожной техники, правильный выбор воздушного фильтра имеет большое значение для надежной работы и долговременной защиты двигателя

Какой эффект дают воздушные фильтры для модифицированных автомобилей и мотоциклов?
Роль воздушного фильтра двигателя заключается в фильтрации песка и пыли в воздухе, обеспечении качества воздуха, поступающего в цилиндр

На чем основана конструкция воздушного фильтра двигателя?
Основная задача воздушного фильтра - эффективно предотвращать попадание всех видов пыли во впускную систему двигателя
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