Stihl 066 Instruction Manual - Page 38

Cleaning HD Filter 2 1 2 1 171BA013 KN 171BA014 KN 145BA030 K Clean the felt prefilter (1) when there is a noticeable loss of engine power After cleaning prefilter several times: Separate the filter components •• Knock out the HD-filter (2) on the palm of your hand or blow it out with compressed air from the inside outward. In case of stubborn dirt or sticky filter fabric: • Wash with STIHL universal cleaner or in a clean, non-flammable cleaning solution (e.g. warm soapy water). Rinse the filter, from the inside outward, under a low-pressure water jet. Do not use a high-pressure washer. • Dry all parts of the filter. Do not expose to high temperatures. • Fit the felt prefilter (1) over the HD filter (2) - note correct installed position • Install HD filter (with felt prefilter) and carburetor box cover. • Check carburetor setting and readjust if necessary. The felt prefilter helps protect the HD filter and thus extends its useful life. For this reason the felt prefilter should be replaced at more frequent intervals than the HD filter. Always replace a damaged filter. 36 066