What the oil filter does
In an oil-injected compressor, the lubricant cools, seals and lubricates the airend. The oil filter removes particles so that the oil in the circuit stays clean. Contaminated oil shortens bearing and airend life.
Identify the element
To identify it:
- Compressor make, model and serial number from the nameplate
- The existing part number and any superseded number
- Photographs of the nameplate and of the installed part
- Operating hours and the fault or service interval that triggered the enquiry
Points to check
When selecting a replacement:
- Thread size, gasket and sealing arrangement
- Filtration rating and bypass valve behaviour as specified for the machine
- Compatibility with the lubricant in use
- Whether the filter is spin-on or a cartridge in a housing
Change with the oil and watch the pressure
The oil filter is normally changed with the oil at the scheduled interval, or sooner if the differential pressure alarm or a restriction sign appears. Contaminated oil found at a service is a reason to look for the cause, not just to change the filter.
Before you order
Confirm the filter specification, not just the thread, matches the machine.
Ask for the supply status of the item: whether it is genuine, OEM-approved or an alternative, and whether it is in stock or must be sourced.
Check the lead-time basis and the warranty terms that apply.
Frequently asked questions
Can any oil filter with the same thread be used?
No. Filtration rating, bypass valve setting and construction differ. A matching thread alone does not make a compatible filter.
How often should the oil filter be changed?
Follow the machine's maintenance schedule. More frequent changes may be needed in hot, dusty or heavy-duty conditions.
What if the filter is blocked early?
An early blockage points to contamination in the oil or the system. We recommend finding the source before simply fitting another filter.