Stihl MS 251 Instruction Manual - Page 79
Chain Lubrication, 11.1 Pickup Body, 11.2 Oil Suction Hose, 11.3 Oil Pump, pickup body first
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11. Chain Lubrication 11.1 Pickup Body 11.2 Oil Suction Hose Impurities gradually clog the fine pores of the filter with minute particles of dirt. This prevents the oil pump from supplying sufficient oil. In the event of problems with the oil supply system, first check the oil tank and the pickup body. - Troubleshooting, b 3.3 - Open the oil tank cap and drain the oil tank b 1. - Remove the clutch, b 4 - Remove the brake band, b 5.2 - Remove the oil pump, b 11.3 - Open the oil tank cap and drain the oil tank. 1 - Collect the oil in a clean container, b 1 - Clean the oil tank if necessary, b1 : Line up the oil suction hose (1) - the straight side of the tab (arrow) must locate against the housing. - Push home the oil suction hose (1) until its groove is properly seated in the engine housing. - Check position of the pickup body and, if necessary, use the hook 5910 893 8800 to re-position it. - Install the oil pump, b 11.3 - Reassemble all other parts in the reverse sequence. 11.3 Oil Pump 2310RA299 TG 1 : Remove the oil suction hose (1) together with the pickup body. - Check the oil suction hose and pickup body and replace if 2 necessary. - Fit the pickup body, b 11.1 219RA457 TG : Use hook (2) 5910 893 8800 to remove the pickup body (1) from the oil tank. Installing - Troubleshooting, b 3.3 - Remove the clutch, b 4 - Remove the brake band, b 5.2 TOP 1 2310RA301 TG Do not overstretch the suction hose. - Pull off the pickup body (1), check it and replace if necessary. - Reassemble in the reverse sequence. : Remove the shim (1). 1 2310RA300 TG - Push the oil suction hose (1), pickup body first, through the housing bore (arrow). 78 MS 231, MS 231 C, MS 251, MS 251 C