Stihl MS 251 Instruction Manual - Page 31
Quick Chain Tensioner, 5.5.2 Chain Catcher, Remove the chain sprocket
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22 4 1 5.5.2 Chain Catcher - Remove the chain sprocket cover. 165RA007 TG 533RA058 TG 2310RA048 TG 1 3 : Inspect the cover (1), spur gear set (2), tensioner slide (3) and thrust pad (4) and replace as necessary. - Clean all disassembled parts, b 14 - Lubricate thread and gears with STIHL multipurpose grease, b 14 - Reassemble in the reverse sequence. - Swing the wing nut (1) upright. : Push the wing nut (1), thin side first (see arrow), into the opening and press it down until it snaps into position. 1 2 1 The chain catcher (arrow) is an integral part of the sprocket cover (1). - If the chain catcher is damaged or worn, install a replacement chain catcher. 2310RA045 TG 5.5.1 Quick Chain Tensioner The quick chain tensioner is installed in the sprocket cover. 1 2 : Take out the screw (arrow). : Remove the cover plate (1) and adjusting wheel (2). When installing the adjusting wheel, make sure its teeth face the cover plate. - Reassemble in the reverse sequence. 1 : Position the replacement chain catcher (1) so that it lines up with the contour of the recess (arrows). : Insert and tighten down the screw (2) firmly. 2310RA428 TG 165RA469 TG : Apply tool to the side (arrow) of the wing nut (1) and carefully pry it out of the sprocket cover. - Reassemble in the reverse sequence. - Check the wing nut (1) and replace if necessary 30 MS 231, MS 231 C, MS 251, MS 251 C