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Once the retaining screws are removed, use a flat screwdriver or a putty knife to gently pry the housing apart.

 
As needed, test the motor in place or remove it for testing and replacement.

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An electric knife is a hand-held, motor-driven appliance for cutting food. It's simple in operation: A gear assembly converts a motor's rotary motion into a reciprocating (back-and-forth) action. The driver arm moves a pair of serrated blades, pushing one forward as it pulls the other one back.
Service the driver assembly:
- Unplug the electric knife and carefully remove the blades.
- Remove the screws at the back of housing and pull the housing apart. Be careful: The blade retainers will be loose and fall out as you open the housing.
- Remove all screws holding the driver assembly and motor to the housing. Lift the motor and driver assembly from the housing.
- Inspect mechanical parts for wear. If the fan doesn't turn smoothly by hand, clean and lubricate the driver assembly with lightweight grease. Add a drop of light machine oil to each bearing before reassembling parts.
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