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When a run capacitor weakens or stops working, the motor it powers may hum or fail to start completely. Reviewing the ratings on your old part helps you find an exact match.
Specifications
- Part number: 9181009-13
- Brand: Ice O Matic
- Part type: Capacitor
- Capacitance: 40.0uF
- Frequency: 50/60HZ
- Height: 2.15 in / 5.46 cm
- Length: 6.4 in / 16.26 cm
- Voltage: 440V
- Width: 4.55 in / 11.56 cm
- µF (MFD): must be the same, like 45/5
- Volts: same or higher (440 can replace 370)
- Shape: round or oval, to fit the bracket
From the maker's and parts sellers' listings for this number. Compare them with the label on your old part.
What this capacitor does
A run capacitor stores electrical energy and releases it to support electric motors. It assists the motor during startup and stabilizes the current while running.
Single run capacitors have two terminals and serve one motor. If the capacitor fails, the connected motor or compressor may hum without turning.
Understanding the 9181009-13 specifications
Capacitor labels list electrical ratings and physical sizes. Each spec must be checked carefully against the original unit.
- Capacitance: 40.0uF
- Voltage: 440V
- Frequency: 50/60HZ
- Height: 2.15 in / 5.46 cm
- Length: 6.4 in / 16.26 cm
- Width: 4.55 in / 11.56 cm
How to confirm a replacement matches
Capacitor ratings must meet strict rules to operate safely in your equipment. The microfarad rating, also written as uF or MFD, must always be the same as the original part.
The voltage rating can 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 physical dimensions and shape must also fit into the existing mounting bracket.
How to identify failure and replace it safely
A common sign of a weak or broken capacitor is a motor that hums but will not spin. When this happens, the issue is often the capacitor rather than the motor itself.
Always disconnect all electrical power and test the circuit before servicing. After discharging the terminals with an insulated tool, take a clear photo of the wiring. Move each wire one at a time to the matching terminal on the new capacitor.
Read your old part
- Locate the part number 9181009-13 printed on the side of your old part case.
- Verify the capacitance rating on the old label reads 40.0uF.
- Check that the voltage rating reads 440V or lower, as voltage must be the same or higher.
- Confirm the operating frequency is rated for 50/60HZ.
- Measure the case to ensure it fits the bracket dimensions: 2.15 in / 5.46 cm height, 6.4 in / 16.26 cm length, and 4.55 in / 11.56 cm width.
When to call a pro
If you are uncertain about testing for power, discharging stored electrical energy, or reconnecting wires, stop immediately. Call a licensed HVAC technician to inspect and service your equipment safely.
Questions
Can I replace this capacitor with one that has a different uF rating?
No. The capacitance value, written as uF or MFD, must be the same as your old part. Changing this value can damage the motor.
Can a 440V capacitor replace a 370V capacitor?
Yes. A replacement capacitor can have the same or higher voltage rating. A 440 V capacitor can replace a 370 V one, but never the other way around.
Is the 9181009-13 a single run or dual run capacitor?
This is a single run capacitor with a single 40.0uF rating. Dual run capacitors have two separate ratings, such as 45/5, and feature three terminals labeled HERM, FAN, and C.
Why does my motor hum but fail to turn?
A motor that hums but will not spin is often caused by a bad capacitor rather than a bad motor. The motor is trying to start but lacks the electrical push provided by the capacitor.
Related part numbers
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