Ice O Matic 9181003-21 Capacitor

What this capacitor does

A start capacitor gives a motor a push to start. Unlike a run capacitor, it shows a microfarad range rather than a single fixed number.

When a capacitor fails, the motor may hum or fail to spin at all. Replacing a worn capacitor helps restore normal startup operation.

Understanding the 9181003-21 specs

When checking your old part, look at the label to verify all electrical and physical measurements. Every rating serves a purpose.

• Capacitance: 189-227uF (shows the range of electrical charge stored for starting)
• Voltage: 330VAC (the maximum operational voltage rating)
• Frequency: 50/60HZ (compatible with standard power supply frequencies)
• Height: 2 in / 5.08 cm
• Width: 2 in / 5.08 cm
• Length: 4.2 in / 10.67 cm

Confirming a replacement match

Capacitor microfarads, written as µF, MFD, or uF, must match the rating of the old part. A start capacitor always lists a specific range.

Voltage ratings must be the same or higher. For example, a 440 V capacitor can replace a 370 V unit, but a lower voltage must never be used. The shape and dimensions, such as round or oval, must fit securely in the mounting bracket.

Safe replacement steps

Line voltage carries serious risk of electrical shock. Always follow correct safety procedures before inspecting or removing an old part.

1. Shut off electrical power at the main breaker and disconnect switch.
2. Test the circuit to confirm no electrical power is present.
3. Discharge the capacitor terminals using an insulated tool.
4. Take a photo of all connected wiring for reference.
5. Disconnect wires one at a time and mount the replacement securely in the bracket.

Read your old part

1. Locate the printed label on the side of your existing capacitor.
2. Check that the part number reads 9181003-21.
3. Verify the capacitance rating matches 189-227uF.
4. Confirm the voltage rating is 330VAC or that a replacement meets or exceeds it.
5. Measure the dimensions to ensure it fits the original mounting bracket.