While many modern centrifuges contain brushless motors, many older models still have brushed drive motors. If these brushes aren't replaced when they become worn, then the electrical contact needed for your centrifuge to spin properly won't be as strong as it should be and will result in performance issues.
Replacing motor brushes is a simple procedure, but you'll need a little finesse and patience to carry it out.
Step 1: Remove the centrifuge's side panels and locate the motor.
Step 2: Locate the flat brush caps on either side of the motor. They look like discs with small teeth lining the edge.
Step 3: Unplug the wires coming out of the caps.
Step 4: Unscrew the first cap. If you can't unscrew it with your fingers, insert a flathead screwdriver into the slot in the center of the cap and turn counter-clockwise.
Step 5: Once loosened, pull the cap out. It will carry a spring and the motor brush out with it.
Step 6: Take the new spring and slide it in. Make sure to align the tabs on the spring's plate with the brush entry.
Step 7: Tighten the cap. Avoid using a screwdriver as you may over tighten it.
Step 8: Repeat steps 4 through 7 for the second brush cap.
Step 9: Reconnect the wires.
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