My SJH904E Hedge Trimmer isn't operating properly, what do I do? Problem Possible Cause Possible Solution Unit does not run Extension cord not connected to the power plug Extension cord not connected to power source Hand safety switch not fully engaged Check extension cord is fully connected to tool Check extension cord is fully connected to a live receptacle Check safety switch is fully depressed prior to pressing trigger switch Slow running, noisy, or hot blades Dry, corroded blades Blades or blade support bent Bent or damaged teeth Loose blade bolts Lubricate blades Straighten blade or blade support Straighten teeth Tighten blade bolts Related articles My SJH901E Hedge Trimmer isn't operating properly, what do I do? How do I advance the spool of the trimmer's string? How should I store my trimmer when not in use? Can the SharperBlade break? What are the best uses for SWJ803E Pole Chain Saw?