Stihl 026 Air Filter Change (Step-by-Step)
To change the air filter on a STIHL 026, stop and cool the saw, engage the chain brake, and brush dirt from the top cover. Remove the cover, retainer, and filter without letting debris enter the intake. Inspect the element, clean it only as its instructions allow, or replace it with the correct type. Seat it evenly before restarting.
Would you rather spend a few minutes checking the filter now, or discover a dirty, poorly seated element after the saw begins to run badly? This guide walks you through the job in order, with the key checks that help keep dust out of the engine.
Equipment Setup and Safety Preparation
Before opening the filter compartment
Work outdoors or in a well-ventilated area, on a stable surface. Stop the engine, engage the chain brake, and let the saw cool. Wear eye protection and work gloves. Keep the bar and chain pointed away from people, and do not service the saw while it is running.
Brush loose sawdust and dirt from the top cover before you open it. This small step matters: debris resting on the cover can fall toward the intake as the cover comes off. If the saw is heavily coated, clean around the cover first rather than trying to remove everything after the filter is exposed.
Have a clean place ready for the filter and retainer. A clean cloth or tray helps keep parts from picking up grit. Check that you have a replacement element that matches the filter arrangement on your 026 if the old element is damaged or too dirty to service.
Key takeaway: Clean the outside around the cover before opening the compartment. Do not start the saw with the filter removed or incorrectly seated.
Field Operation: Air-Filter Service
This is the removal and service sequence. Take care when the intake is exposed: the goal is to remove and inspect the filter without dropping dirt into the opening. If you see debris inside the intake, stop rather than trying to clear it by starting the engine.
Step-by-step filter removal
- Brush the top of the saw. Clear loose dust from around the cover and its fastener. Avoid sweeping dirt toward the seam.
- Remove the top cover. Undo its fastener and lift the cover off carefully. Put the fastener and cover somewhere clean.
- Locate the retainer and filter. The exact arrangement may differ. Note how the retainer holds the element before removing it; a quick photo can help you put it back the same way.
- Remove the retainer, then the element. Lift them out gently. Do not scrape or shake dirt into the intake.
- Cover the exposed intake if you need to pause. Use a clean, lint-free cover placed over the opening, and remove it before reassembly. Do not push a rag or loose material into the intake.
Inspect the exposed area before going further. If you see dirt or other debris inside the intake, do not run the saw. Arrange for the intake to be cleaned safely before use; loose debris can be drawn into the engine.
Key takeaway: Keep the opening clean and protected. A filter change is not a reason to test-run the saw without its filter.
Maintenance, Inspection, and Replacement
Inspection determines whether the element can be cleaned or needs replacement. A filter that looks only dusty may still have damaged media or a poor seal, while a visibly torn or misshapen element cannot protect the intake properly. Use the instructions for the filter fitted to your saw.
Clean or replace?
Check the full element, including its edges and sealing surfaces. Look for tears, cracks, deformation, damaged seals, heavy oiling, or dirt embedded in the filter material. If it is torn, misshapen, or persistently clogged, replace it with a filter specified for your 026 configuration.
Filter materials and approved cleaning methods can differ. Follow the element’s instructions or the applicable 026 manual. Do not assume every filter can be washed, brushed, or blown clean. In particular, do not use gasoline to clean the filter, and do not direct high-pressure compressed air at it. Either can damage the media or create a safety hazard.
| What you find | What to do | Before using the saw |
|---|---|---|
| Light, loose dirt; element intact | Clean only by the method allowed for that filter | Check for damage and confirm it seats evenly |
| Dirt remains embedded after approved cleaning | Replace the element | Fit the correct type and inspect its seal |
| Tear, deformation, or damaged sealing edge | Replace the element | Do not run with the damaged filter |
| Dirt visible inside the intake | Stop service and have the intake cleaned | Do not start the saw until it is clear |
| Filter type or cleaning method is uncertain | Check the manual or filter instructions | Do not guess at a cleaning method |
There is no universal air-filter torque specification for this job. Secure the retainer and cover as designed, but do not force parts or overtighten plastic retainers. If a fastener will not engage smoothly, remove it and check alignment rather than turning harder.
Key takeaway: If the filter is damaged, remains clogged, or will not seal correctly, replace it. Keep fuel and improvised cleaning methods away from the filter.
Reinstall the Filter and Verify the Fit
Correct seating matters as much as a clean element. The filter must lie fully in its sealing seat, with its retainer and cover secured. A visible gap, folded edge, or loose retainer can let unfiltered air and dust pass toward the engine.
Reassembly and restart check
- Check the seat. Make sure the sealing area is free of loose dirt. Do not push debris into the intake while wiping around it.
- Place the filter evenly. Align it with the seat and confirm that the edges are fully in place. Do not force a filter that appears to be the wrong shape or size.
- Install the retainer. Fit it in its original position. Check that it holds the element without pinching or distorting it.
- Replace the top cover. Align it and start the fastener without cross-threading. Tighten it securely, without forcing or overtightening plastic parts.
- Check your work. Look around the cover and filter edges for a gap, displaced seal, or trapped material.
Only after the filter and cover are correctly installed should you start the saw. Start it outdoors using the normal cold- or warm-start procedure. Listen for normal operation and check that the chain does not move at idle. If the engine runs abnormally or the chain moves at idle, stop and investigate rather than continuing to cut.
The 026’s approximate idle speed is 2,800 rpm, but air-filter service is not an idle adjustment. Do not change the idle setting just because you have removed or replaced the filter. If the saw still runs poorly after correct filter service, further diagnosis may be needed.
Key takeaway: Never use a brief run without the filter as a test. Unfiltered operation can draw abrasive dust into the engine and cause rapid wear.
Maintenance, Inspection, and Replacement
There is no single calendar interval that suits every working condition. Dust, sawdust, and the type of work affect how quickly an element becomes dirty. Inspect the filter when conditions warrant and follow the service guidance for the filter and saw.
A practical inspection routine
Check the filter if the saw has been used in dusty conditions, if visible dirt has built up, or if a change in running prompts you to inspect it. These signs do not prove that the filter is the cause, but they are sensible reasons to check it. Do not wait for a particular symptom if the element is visibly damaged.
Use the same careful sequence each time: clean around the cover, remove the element without dropping dirt into the intake, inspect it, and reinstall it evenly. A replacement filter must match the configuration on the saw. Production versions and replacement parts can differ, so compare the element and retainers on your machine rather than relying on appearance alone.
| Service condition | Inspection focus | Action |
|---|---|---|
| Saw used in dusty surroundings | Loose dirt and blocked media | Inspect and service by the approved method |
| Filter removed for any reason | Seal, fit, and retainer position | Reinstall evenly before starting |
| Engine runs differently | Filter condition and seating | Check the filter, then investigate further if needed |
| Saw stored between jobs | Cleanliness and secure fit | Keep the cover in place and inspect before use |
Key takeaway: Let the filter’s condition and the applicable instructions guide service. There is no universal interval or cleaning method for every element.
Workshop Scenarios: Common Filter-Change Problems
These examples are practical situations, not tests of every STIHL 026. They show how to apply the same inspection steps when the filter or intake does not look as expected.
Dust falls toward the intake
A filter is removed and loose dirt is seen near the opening. Stop before continuing. Do not brush it inward or start the engine to “clear it.” Keep additional debris out and have the intake cleaned before running the saw.
The replacement element will not sit flat
A filter that rocks, folds, or leaves a visible gap may be the wrong type, or it may not be aligned with its seat. Remove it and compare it with the original arrangement and the part specified for the saw. Do not use the retainer to force an ill-fitting element into place.
The filter looks clean, but the saw still runs poorly
A clean-looking filter does not confirm that every other part of the saw is working properly. Check that the element is seated and the cover is secured. If operation remains abnormal, stop and seek further diagnosis; do not change unrelated settings as part of an air-filter replacement.
Key takeaway: Stop when the fit is uncertain or debris is inside the intake. Correct the cause before starting the saw.
Frequently Asked Questions
How do I change the air filter on a STIHL 026?
Stop and cool the saw, engage the chain brake, clean around the top cover, and remove the cover, retainer, and filter. Inspect or service the element, then reinstall it evenly and secure the cover before starting.
Do all STIHL 026 saws use the same air filter?
Not necessarily. Filter style and retainers can differ by production version or replacement parts. Check the arrangement on your saw and use an element specified for that configuration.
Can I run the 026 briefly with the filter removed?
No. Do not start or run the saw with the filter removed, damaged, or incorrectly seated. Dust can enter the engine and cause abrasive wear.
Can I clean the filter with gasoline?
No. Do not use gasoline to clean the filter. Follow the cleaning instructions for the specific filter material fitted to your saw.
Can I use compressed air on the air filter?
Do not direct high-pressure compressed air at the filter. It can damage the media and may create a debris hazard. Use only a cleaning method allowed by the element’s instructions.
When should I replace the filter instead of cleaning it?
Replace it if it is torn, misshapen, has damaged sealing surfaces, or remains clogged after an approved cleaning. Use the correct filter for your saw’s configuration.
What if I see dirt inside the intake?
Do not start the saw. Stop work and have the intake cleaned before operating the machine. Avoid pushing debris farther into the opening.
Is there a torque setting for the air-filter retainer?
There is no universal air-filter torque specification for the STIHL 026. Secure the parts as designed, and do not overtighten plastic retainers or force misaligned fasteners.
Should I adjust the idle after changing the filter?
Not as a routine part of filter service. The approximate idle speed is 2,800 rpm, but changing the filter does not by itself call for an idle adjustment. Stop and investigate if the saw runs abnormally or the chain moves at idle.
How often should I inspect the filter?
Inspect it when it is visibly dirty, after dusty work, or when conditions or symptoms make a check sensible. Follow the applicable manual and filter instructions; there is no single interval for every working condition.
Before you head out: confirm the element is the correct type, clean or replace it as allowed, and check that it sits fully in its seat. Secure the retainer and cover, then start the saw only with the filter properly installed.
(This article was written by one of our staff writers, David Hensley. Visit our Meet the Team page.)
