For an oil-injected screw compressor, the oil filtration system is an important part of routine maintenance. Compressor oil does more than lubricate moving components. It also helps cool the compression element, seal internal clearances, and carry contaminants through the lubrication circuit.
The Atlas Copco 1621737800 oil filter, also identified as 1621 7378 00 or 1621-7378-00, is an oil filter reference for compatible Atlas Copco oil-injected screw compressor applications.
If you are looking for a 1621737800 replacement oil filter, identifying the correct part number is an important first step before purchasing.
What Is the Atlas Copco 1621737800 Oil Filter?
The 1621737800 is an Atlas Copco oil filter designed for use in compatible oil-injected screw compressor applications.
Atlas Copco's product information identifies 1621737800 as a filter for oil-injected screw compressors. The purpose of this type of filter is to remove contaminants from the compressor lubricant and help maintain clean oil circulation through the compressor system.
During compressor operation, the lubricant can collect contaminants such as dust, deposits, and other foreign particles. If these contaminants remain in circulation, they may contribute to wear of lubricated components.
This is why the oil filter should be considered an important part of the compressor lubrication system rather than simply a consumable filter.
For customers looking for this specific part, you can view the [Atlas Copco 1621737800 Oil Filter product page] for product information and quotation.
1621737800, 1621 7378 00 and 1621-7378-00
When searching for compressor spare parts online, the same part number may appear in several formats.
For this oil filter, common search formats include:
•1621737800
•1621 7378 00
•1621-7378-00
•Atlas Copco 1621737800
•Atlas Copco 1621 7378 00
•1621737800 oil filter
•1621737800 replacement
•1621737800 spare part
These different formats are important because purchasing databases, supplier websites, maintenance records, and search engines may use different ways of displaying the same numeric part number.
When requesting a quotation, it is best to provide the complete part number 1621737800 together with the compressor model whenever possible.
Why Does an Oil-Injected Screw Compressor Need an Oil Filter?
Oil-injected screw compressors use lubricant as part of the compression process.
Atlas Copco explains that compressor oil performs several important functions, including lubrication, cooling, sealing, and contamination management.
Because the lubricant continuously circulates through the compressor system, maintaining oil cleanliness is important.
According to Atlas Copco's compressor filtration information, contaminants in the oil can damage the compression element, rotors, housing, and bearings. The oil filter captures dust, deposits, and other foreign particles to help maintain clean oil flow to the compressor element.
A properly maintained oil filtration system therefore supports several aspects of compressor maintenance:
•Cleaner lubricant circulation
•Protection of lubricated compressor components
•Reduced contamination in the oil circuit
•Protection of bearings and other mechanical components
•Reduced risk of premature oil separator contamination
•More consistent compressor maintenance
The oil filter is only one part of the overall system, so oil condition, air filtration, oil separation, and the compressor's operating environment should also be considered during maintenance.
What Does an Oil Filter Actually Remove?
The exact filtration characteristics depend on the filter design and compressor application, so a universal filtration rating should not be assumed for every Atlas Copco oil filter.
In general, an oil filter is intended to capture contaminants present in the compressor lubricant, including:
•Dust particles
•Deposits
•Foreign particles
•Wear-related contamination
•Contaminants generated or carried within the lubrication system
The purpose is not simply to make the oil visually clean. The more important objective is to prevent contaminants from continuing to circulate through components that depend on clean lubricant.
For this reason, selecting the correct filter for the compressor is more important than choosing a filter based only on external appearance.
Atlas Copco 1621737800 Oil Filter Replacement
If the existing compressor filter is identified as 1621737800, the replacement should be verified before ordering.
Do not select an oil filter only because it looks similar to the old one.
The following information can help confirm the correct replacement:
1. Existing Part Number
Check the number printed or marked on the existing filter.
Look for:
1621737800
or another recognized format such as:
1621 7378 00
2. Compressor Model
Provide the exact compressor model if available.
This is particularly useful when several similar-looking filters are used across different compressor configurations.
3. Compressor Serial Number
If the compressor model alone does not provide enough information, the serial number can help identify the correct configuration.
4. Existing Filter Photos
A clear photograph of the existing filter can help compare:
•External appearance
•Connection arrangement
•Mounting interface
•Part-number markings
•Overall configuration
5. Maintenance Documentation
If the original compressor service documentation lists the filter part number, use that information as an additional reference.
How to Know When an Oil Filter Needs Attention
An oil filter is a maintenance component and should be inspected or replaced according to the maintenance requirements of the specific compressor.
There is no single replacement interval that applies to every compressor, because operating conditions can be different.
Factors that may influence filter condition include:
•Compressor operating hours
•Compressor load
•Ambient dust
•Operating temperature
•Lubricant condition
•Oil change history
•Compressor maintenance history
•Contamination level in the lubrication system
Atlas Copco also notes that oil filtration is one of the factors to consider when determining the condition and replacement requirements of compressor oil.
For this reason, maintenance personnel should follow the service recommendations applicable to the specific compressor rather than relying on a generic replacement interval from an unrelated machine.
Possible Signs of an Oil Filtration Problem
An oil filter problem does not always produce a single obvious symptom.
Depending on the compressor design and the actual cause, maintenance personnel may encounter:
•Abnormal oil pressure or oil-flow conditions
•Increased compressor operating temperature
•Lubrication-related alarms
•Abnormal compressor operation
•Evidence of excessive contamination
•Reduced maintenance performance
•Unexpected oil deterioration
However, these symptoms do not automatically mean that the oil filter itself is defective.
Other components and conditions should also be checked, including:
•Compressor oil
•Oil cooler
•Oil circuit
•Oil level
•Sensors
•Control system
•Oil separator
•Air filter
•Compressor operating conditions
A correct diagnosis is therefore important before replacing parts.
Oil Filter vs. Air Filter vs. Oil Separator
One of the most common mistakes when purchasing compressor spare parts is confusing different types of filters.
Although they are all related to filtration, they perform different jobs.
Oil Filter
The oil filter is part of the lubricant circuit.
Its purpose is to remove contaminants from compressor oil before the oil continues through the relevant lubrication system.
Example: Atlas Copco 1621737800
Air Filter
The air filter is installed on the compressor intake side.
It helps prevent dust and other particles from entering the compressor through the incoming air.
Oil Separator
The oil separator has a different function.
In an oil-injected screw compressor, compressed air leaving the compression element contains oil mist. The oil separator helps separate oil from the compressed air so that the oil can be returned to the lubrication circuit.
Atlas Copco separately identifies air filters, oil filters, and oil separators as different components within the compressor filtration system.
Therefore:
Oil Filter ≠ Air Filter ≠ Oil Separator
This distinction is especially important when ordering spare parts.
Can You Use a Different Oil Filter Instead of 1621737800?
A different filter should not be considered interchangeable simply because it has similar dimensions or is described as an "Atlas Copco oil filter."
Different filters can have different:
•Mounting interfaces
•Sealing arrangements
•Internal construction
•Flow characteristics
•Application requirements
•Compressor compatibility
For this reason, the safest starting point is the original part number.
If your compressor currently uses 1621737800, provide that part number when requesting a replacement.
If you are uncertain, provide the compressor model, serial number, and photographs of the existing filter so the application can be checked before ordering.
Why Part Number Verification Matters
Industrial compressor spare parts are often identified by specific part numbers rather than by generic product names.
For example, searching only for:
Atlas Copco oil filter
can produce many different filter part numbers.
Searching for:
Atlas Copco 1621737800 oil filter
is much more precise.
This is why the complete part number should be included in purchasing documents, quotation requests, maintenance records, and spare-parts inventory whenever possible.
For international purchasing, keeping the original part number also makes communication easier between:
•Compressor operators
•Maintenance engineers
•Purchasing departments
•Spare-parts suppliers
•Service companies
Buying Guide for Atlas Copco 1621737800
Before purchasing a replacement oil filter, we recommend checking the following information.
Part Number
Confirm:
1621737800
Compressor Information
Provide:
Compressor brand
Compressor model
Serial number if available
Year or configuration information if known
Quantity
Specify the number of filters required.
Product Type
Confirm that the requested component is an oil filter, not an air filter or oil separator.
Product Status
If the purchasing requirement is specific, clarify whether you need:
Genuine OEM
Aftermarket replacement
Equivalent replacement
This is particularly important when purchasing compressor parts internationally.
How to Request a Quote for 1621737800
If you need a quotation for Atlas Copco 1621737800, you can provide the following information to the supplier:
Part Number: 1621737800
Alternative Format: 1621 7378 00
Product: Oil Filter
Compressor Brand: Atlas Copco
Compressor Model: If available
Quantity:
Delivery Country:
If the part number is uncertain, add photographs of the existing filter and the compressor nameplate.
This information can significantly reduce the risk of receiving a filter intended for a different compressor configuration.
Final Thoughts
The oil filter is a small component compared with the complete compressor, but it plays an important role in maintaining lubricant cleanliness.
For the Atlas Copco 1621737800 oil filter, the most important purchasing step is accurate identification.
Remember these key points:
•1621737800 is the primary part number.
•1621 7378 00 and 1621-7378-00 are alternative number formats.
•The component is an oil filter, not an air filter or oil separator.
•It is associated with compatible oil-injected screw compressor applications.
•The correct replacement should be verified using the part number and compressor information.
•Maintenance intervals should follow the requirements of the specific compressor.
•If compatibility is uncertain, provide the existing part number, compressor model, serial number, and photographs.
For customers currently sourcing this component, visit the Atlas Copco 1621737800 Oil Filter product page to check the available product information and request a quotation.
