Stihl MS 193 T Product Instruction Manual - Page 39
Taking Care of the Guide, Shroud
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English 143BA057 KN Taking Care of the Guide Bar 2 1 3 N Turn the bar over - every time you sharpen the chain and every time you replace the chain - this helps avoid one-sided wear, especially at the nose and underside of the bar. N Regularly clean the oil inlet hole (1), the oilway (2) and the bar groove (3). N Measure the groove depth - with the scale on the filing gauge (special accessory) - in the area used most for cutting. 143BA026 KN Chain type Picco Rapid Rapid Rapid Pitch Minimum groove depth 3/8" P 0.20" (5.0 mm) 1/4" 0.16" (4.0 mm) 3/8"; 0.325" 0.24" (6.0 mm) 0.404" 0.28" (7.0 mm) If groove depth is less than specified: N 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 bar rails. Shroud Remove shroud The shroud catch may vary depending on the version. Version A N Use a suitable tool to open the catch by turning it 90° to the left N Lift off the shroud Version B N Turn lever 90" to the left N Lift off the shroud Refitting the shroud 143BA056 KN Install parts in reverse order. MS 170, MS 170 C, MS 180, MS 180 C 37