14 X7502310908© 03/2014 ECHO Inc.SRM-280U ASSEMBLY3. Thread line head (J) onto PTO shaft by turning itcounter-clockwise until head is tight against upper plate (A).4. Remove locking tool (G).Semi-automatic nylon line heads must be used only with plasticdebris shield with cut-off knife. Using nylon line heads withmetal debris shield can result in trimmer damage, caused byoperation with excessive line length.Note: Your nylon line head may appear different than nylon line head shown.To Advance Trimmer LineSee Maintenance Section for nylon line replacement.Note: To advance trimmer line, tap trimmer head against the ground while the head is turning at normaloperating speed.Remove Nylon Line HeadNote: Do not disassemble nylon line head.1. Align locking hole in upper plate with notch in edge of gearhousing and insert head locking tool (G).2. Remove line head (J) by turning it clockwise until head iscompletely off of shaft.3. Remove locking tool (G).Blade InstallationYou must install the U-Handle and all Blade Conversion parts shown in the following instructionsbefore operating this unit with a metal blade, otherwise serious injury may result.Note: includes U-Handle, and necessary blade conversion parts. Blades must be selected for type ofcutting being performed. See “Blade Selection.”Install Metal Shield1. If installed remove nylon line head, upper fixing plate, shieldplate, and plastic shield.Parts Required: Metal Shield, Shield Bracket,3 - 5 x 16 mm screws (metal shieldto gear housing).2 - 5 x 8 mm screws, 2 - 5 mm nuts,2 - 5 mm lockwashers, (bracket toshield).2 - 5 mm nuts, 2 - 5 mm lockwashers(bracket to gear housing)GJGJH GJ