Stihl HT 70 Instruction Manual - Page 29
Taking Care of Guide Bar, Cleaning the Air Filter, Turn the bar over, Measure groove depth
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english Taking Care of Guide Bar Cleaning the Air Filter : Measure groove depth - with scale on filing gauge - see "Special Accessories" - in area 2 used most for cutting on Rollomatic bars. Chain type Picco-Mini Chain pitch Minimum groove depth 3/8" P 5.0 mm (0.20") 1 3 : Turn the bar over - every time you sharpen the chain - and every time you replace the chain - this avoids one-sided wear, especiallly at nose and underside of the bar. Regularly clean 1 = oil inlet hole 2 = oil passage 3 = bar groove If groove depth is less than specified: : Replace the guide bar. The drive link tangs will otherwise scrape along the bottom of the groove - the cutters and tie straps will not ride on the rails. 2 1 Dirty air filters reduce engine power increase fuel consumption and make starting more difficult. If there is a noticeable loss of engine power : Move choke lever to g. : Press in the tab (1). : Ease the filter cover (2) over the tab and take it away. : Clean away loose dirt from around the filter. : Remove the foam and felt filter elements. 390BA050 KN 355BA014 KN 28 HT 70, HT 75
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