Stihl MS 251 Instruction Manual - Page 80
push the tube 2 into its, seat arrow until it is flush
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32 1 1 2 2310RA302 TG 2310RA305 TG 2310RA308 TG : Pull the worm (1) with drive spring (2) out of the oil pump. - Check the spring and worm and replace if necessary. 13 1 : Pull the hose (1) off the nipple. - Check the oil pump and replace it if necessary : Place oil pump (1) in position and push the tube (2) into its seat (arrow) until it is flush with the engine housing. Installing : Fit the screw (3) and tighten it down firmly. - Push the worm home as far as stop - it must rotate freely. 2 2310RA303 TG TOP 2310RA306 TG 1 1 : Take out the screw (1), lift the oil pump (2) and push the hose (3) : Position the hose (1) so that the out of its seat (arrow). ribs (arrows) are in alignment. 2310RA309 TG : Push the washer (1) into position. Installed position is correct when "TOP" (arrow) faces outwards. 1 - Reassemble all other parts in the reverse sequence. 2310RA307 TG 2310RA304 TG 2 : Pull the oil pump (1) off the oil suction hose (2). 1 : Position the oil suction hose (1) so that the straight sides of the lugs (arrows) locate against the engine housing. : Push the oil suction hose (1) onto the nipple. MS 231, MS 231 C, MS 251, MS 251 C 79