Kohler — Air Cleaner Service Procedure
Maintenance · Air cleaner and precleaner
From a Kohler service manual covering: 12RES, 8.5/12 RES, 8.5RES. Check it applies to your exact model before use.
Applies to: Kohler 12RES, Kohler 8.5RES, Kohler CH20 engine, Kohler CH 740 engine
Before you start
- A sudden backfire can cause severe injury or death. Do not operate the generator set with the air cleaner removed.
Parts for this job
- ADV-6823-A Air filter — Kohler 12RES Amazon eBay
- ADV-6823-A Air filter — Kohler 8.5RES Amazon eBay
Part numbers from the service-parts lists for Kohler 12RES, Kohler 8.5RES. Verify against your serial number before ordering; some links are affiliate links.
Procedure
- Disable the generator set: master switch OFF/RESET, disconnect battery charger power, disconnect battery negative lead first.
- Loosen air cleaner cover retaining knob and remove cover.
- Remove element cover nut, element cover, and paper element with precleaner.
- Remove the precleaner from the paper element.
- Wash precleaner in warm soapy water; rinse until water runs clear.
- Squeeze out excess water and allow precleaner to air dry; do not wring or use compressed air.
- Saturate precleaner with new engine oil; squeeze out excess oil.
- Replace the paper element if dirty, bent, or damaged; do not wash or blow out with compressed air.
- Install the precleaner over the paper element.
- Check the air cleaner base and element cover; replace damaged components and worn seals.
- Install element, precleaner, element cover, element cover nut, and cover; finger-tighten cover knob.
- Reconnect battery, negative lead last; reconnect power to battery charger.
Full service-parts list: Kohler 12RES →, Kohler 8.5RES →
Source: Kohler service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.