Instruction Manual
Page 5
... for operations in burns or other serious injuries. Improper handling may result in this service manual. Do not re-use original STIHL replacement parts. fuel hoses can be maintained when tightening down screws, nuts and other source of engine damage due to a... container and dispose of the hoses and the connectors with fuel must be tightened to overheating. 4 MS 231, MS 231 C, MS 251, MS 251 C Preparations for servicing Remove the chain sprocket cover, saw chain and guide bar before re-installing - Storing and disposing of oils and fuels Collect fuel or lubricating...
... for operations in burns or other serious injuries. Improper handling may result in this service manual. Do not re-use original STIHL replacement parts. fuel hoses can be maintained when tightening down screws, nuts and other source of engine damage due to a... container and dispose of the hoses and the connectors with fuel must be tightened to overheating. 4 MS 231, MS 231 C, MS 251, MS 251 C Preparations for servicing Remove the chain sprocket cover, saw chain and guide bar before re-installing - Storing and disposing of oils and fuels Collect fuel or lubricating...
Instruction Manual
Page 9
... under full load Cause Clutch shoes badly worn Clutch drum badly worn Remedy Install new clutch Install new clutch drum Saw chain rotates at idle speed Engine idle speed too high Clutch springs stretched Clutch springs broken Readjust idle speed screw LA Replace the clutch springs or ... Clutch shoe retainer broken Clutch shoes and carrier worn Replace all clutch springs Fit new needle cage Install new retainer or clutch Install new clutch 8 MS 231, MS 231 C, MS 251, MS 251 C
... under full load Cause Clutch shoes badly worn Clutch drum badly worn Remedy Install new clutch Install new clutch drum Saw chain rotates at idle speed Engine idle speed too high Clutch springs stretched Clutch springs broken Readjust idle speed screw LA Replace the clutch springs or ... Clutch shoe retainer broken Clutch shoes and carrier worn Replace all clutch springs Fit new needle cage Install new retainer or clutch Install new clutch 8 MS 231, MS 231 C, MS 251, MS 251 C
Instruction Manual
Page 10
... drum badly worn Brake band blocked Install new clutch Install new clutch drum Check freedom of movement and operation of brake band Saw chain rotates at idle speed Engine idle speed too high Clutch springs stretched Clutch springs broken Readjust idle speed screw LA Replace the ...clutch springs or install new clutch Replace the clutch springs Saw chain does not stop immediately when brake is activated Brake spring stretched or broken Fit new brake spring Brake band stretched or worn Clutch drum worn Fit new brake band Install new clutch drum MS 231, MS 231 C, MS 251, MS 251 C 9
... drum badly worn Brake band blocked Install new clutch Install new clutch drum Check freedom of movement and operation of brake band Saw chain rotates at idle speed Engine idle speed too high Clutch springs stretched Clutch springs broken Readjust idle speed screw LA Replace the ...clutch springs or install new clutch Replace the clutch springs Saw chain does not stop immediately when brake is activated Brake spring stretched or broken Fit new brake spring Brake band stretched or worn Clutch drum worn Fit new brake band Install new clutch drum MS 231, MS 231 C, MS 251, MS 251 C 9
Instruction Manual
Page 17
... incorrect - throttle shutter completely closed Tank vent faulty Clean the carburetor Reset low speed screw (L) correctly Reset idle speed screw (LA) correctly Replace tank vent Saw chain rotates at idle speed Leak on fuel hose from tank to carburetor Seal connections or install new fuel hose Engine idle speed too high Readjust... screw LA (counterclockwise) Clutch springs stretched or fatigued Replace the clutch springs or install new clutch Clutch spring hooks broken Replace the clutch springs 16 MS 231, MS 231 C, MS 251, MS 251 C
... incorrect - throttle shutter completely closed Tank vent faulty Clean the carburetor Reset low speed screw (L) correctly Reset idle speed screw (LA) correctly Replace tank vent Saw chain rotates at idle speed Leak on fuel hose from tank to carburetor Seal connections or install new fuel hose Engine idle speed too high Readjust... screw LA (counterclockwise) Clutch springs stretched or fatigued Replace the clutch springs or install new clutch Clutch spring hooks broken Replace the clutch springs 16 MS 231, MS 231 C, MS 251, MS 251 C
Instruction Manual
Page 21
...the screw (1) from the brake lever (2). 2310RA008 TG 2310RA006 TG - the chain must not rotate. : Pry the brake band (2) out of its remaining thickness is measured in order if deceleration of the machine. 20 MS 231, MS 231 C, MS 251, MS 251 C A fatigued or stretched brake spring has the same negative effect. 5.2... surfaces of the brake band and clutch drum impair the coefficient of the most important safety devices on the chain saw. The clutch drum must come areas on the rear handle - 5. Remove the brake band without overstretching it from the underside...
...the screw (1) from the brake lever (2). 2310RA008 TG 2310RA006 TG - the chain must not rotate. : Pry the brake band (2) out of its remaining thickness is measured in order if deceleration of the machine. 20 MS 231, MS 231 C, MS 251, MS 251 C A fatigued or stretched brake spring has the same negative effect. 5.2... surfaces of the brake band and clutch drum impair the coefficient of the most important safety devices on the chain saw. The clutch drum must come areas on the rear handle - 5. Remove the brake band without overstretching it from the underside...
Instruction Manual
Page 97
... - The setting of lubrication and overheating. 96 MS 231, MS 231 C, MS 251, MS 251 C Shut off the engine. - Turn the idle speed screw (LA) counterclockwise until the chain stops running , then turn it back 1 full turn . Troubleshooting, b 3.6 - Check chain tension and adjust if necessary. - Turn the high... screen (if fitted) and clean or replace if necessary, b 3.7 or b 6.1 2310RA285 TG - Carry out standard setting. - Saw chain runs while engine is not satisfactory when operating at high altitude A minor correction may be removed for operation at high altitude. - Turn...
... - The setting of lubrication and overheating. 96 MS 231, MS 231 C, MS 251, MS 251 C Shut off the engine. - Turn the idle speed screw (LA) counterclockwise until the chain stops running , then turn it back 1 full turn . Troubleshooting, b 3.6 - Check chain tension and adjust if necessary. - Turn the high... screen (if fitted) and clean or replace if necessary, b 3.7 or b 6.1 2310RA285 TG - Carry out standard setting. - Saw chain runs while engine is not satisfactory when operating at high altitude A minor correction may be removed for operation at high altitude. - Turn...
