CAP004 Generic 4uF Motor Run Capacitor, Universal Appliance Part for Fan Motors, Pump Motors and Small Single Phase Motors

CAP004 is a generic 4uF capacitor, a universal replacement for the run capacitor fitted to many small appliance motors. It isn't made for one brand. It's a compatible aftermarket part that you choose by its values. The capacitance is 4uF, so confirm your old capacitor reads 4uF, and check its voltage rating and connection style match before you fit it.

Motor humming but not starting, a sign of a failed capacitor

A run capacitor gives a single phase motor the phase shift it needs to get turning and keep spinning in the right direction. When the capacitor weakens or fails, the motor hums but won't start, only starts if you give it a push, runs slowly or gets hotter than normal. A failed capacitor may look swollen, cracked or leaky. Fan motors, pump motors and other small motors in appliances all show these symptoms, and swapping the capacitor is often a much cheaper fix than replacing the motor.

Part details

• Generic part code CAP004
• 4uF capacitance
• Universal replacement for motor run capacitors
• Match the voltage rating and connection style to your old capacitor

Fitting a run capacitor safely

Isolate the power before touching anything, and treat the old capacitor as live until it has been safely discharged, as it can hold a charge. Write down the uF value and voltage printed on the old one and photograph the wiring. Fit the new capacitor in the same spot and clamp it so it can't vibrate. Hard-wired equipment must be done by a licensed electrician.

Questions about this part

Can I use a capacitor with a different uF value?

No. Stick with the same capacitance as the original, which is 4uF for this part. The voltage rating of the replacement should equal or exceed the old one, never sit below it.