Grass Trimmer /Brush CuTTer21OperaTOr's manualmaIntenance IntervalsCOMPONENT/SYSTEMMAINTENANCEPROCEDUREREQ'DSKILLLEVELDAILY ORBEFOREUSEEVERYREFUEL3 MONTHSOR 90HOURSYEARLY600 HOURSAir Filter Inspect/Clean 1 I / C * R *Choke Shutter Inspect/Clean 1 I / CFuel Filter Inspect/Replace 1 I * I / R *Fuel Cap Gasket Inspect/Replace 1 I * R *Fuel System Inspect/Replace 1 I (3) * I (3) *Spark Plug Inspect/Clean 1 I / C / R *Cooling System Inspect/Clean 2 I / CMuffler Spark Arrestor Inspect/Clean/Replace 2 I / C / R *Cylinder Exhaust Port Inspect/Clean/Decarbon 2 I / CDrive Shaft (Flex CableModels) Grease 2 I (1)Gear Housing Grease 2 I (2)Recoil Starter Rope Inspect/Clean 1 I / C *Screws/Nuts/Bolts Inspect/Tighten/Replace 1 I *(2) Apply POWER BLENDX TM grease every 50 hours of use.(3) Low evaporative fuel tanks DO NOT require regular maintenance to maintain emission integrity.* Replacement is recommended based on the finding of damage or wear during inspection.MAINTENANCE PROCEDURE LETTER CODES: I = INSPECT, R = REPLACE, C = CLEANIMPORTANT NOTE - Time intervals shown are maximum. Actual use and your experience will determine thefrequency of required maintenance.MAINTENANCE PROCEDURE NOTES:(1) Apply POWER BLENDX TM grease every 25 hours of use.