How to Replace the Brushes on a Craftsman Reciprocating Saw

A reciprocating saw uses an up-and-down motion to cut and can be useful for getting into areas too small for a handsaw. Tool manufacturer Craftsman makes several different models of reciprocating saw. Upkeep of the motor is important to ensure that the saw continues working in top form, and one essential component of the motor is the brushes. These are small blocks of carbon that conduct currents between moving and stationary parts, usually within a rotating shaft. A spring is used to force the brushes against the cylindrical commutator, which produces torque. This creates the electric current. At some point in the life of your reciprocating saw, you will need to clean or replace the brushes. Most Craftsman models offer easy access to the motor brushes, and replacing them does not take long. Signs of a faulty brush include failure to start, irregular starting and an increase in sparking.

Screwdriver
Allen wrench
Replacement brushes

Instructions

- 1
  Using the screwdriver or Allen wrench (depending on the model), remove the casing around the motor. Examine the area around the brushes and then remove the housing around the brush. Be sure to regularly examine your brushes for signs of wear.
- 2
  Remove the spring that forces the brush to rub against the commutator. Using gentle but steady pressure, you should be able to simply pull the spring out. If it is stuck, use pliers at the base and delicately pull it loose—be careful not to alter the shape of the spring during removal. Examine the spring for signs of wear. Remove the faulty brushes, noting the way the brushes are installed.
- 3
  Install the replacement brushes and springs in the same way the faulty ones came out. Make sure brushes are properly positioned, keeping the same orientation as the previous ones. Brushes should fit to the curve of the commutator. Be sure that the brushes are aligned correctly.
- 4
  Blow out any dust. Using a rag, wipe away any grime surrounding the brushes and their springs while you still have the motor exposed. Securely replace the casing around the motor.
- 5
  Turn the tool on to test the brushes.

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