My SJH901E Hedge Trimmer isn't operating properly, what do I do? Problems Possible Cause Possible Solution Product does not start Not connected to power supply. Power cord or plug is defective. Other electrical defect to the product. Connect to power supply Product does not reach full power Extension cord not suitable for operation with this product. Power source (e.g. generator) has too low voltage. Air vents are blocked. Use a proper extension cord. Connect to another power source. Clean the air vents. Unsatisfactory result Blade is worn/damaged. Thickness of branches exceeds capacity. Replace with new blade. Only cut branches complying with the capacity Excessive vibration or noise Blade is damaged. Bolts/nuts are loose. Replace with new blade. Tighten bolts/nuts. Related articles My SJH904E Hedge Trimmer isn't operating properly, what do I do? What tools do I need to install the SharperBlade? The motor for my SBJ597E fails to start when switch is turned on. How do I advance the spool of the trimmer's string? With so many makes and models of Walk-behind Edgers, how does one (1) SharperBlade fit on all of them?