Kärcher Pressure Washer Capacitor - 40UF - 6.661-298.0

The 40UF capacitor provides the initial electrical boost needed to start the motor. It helps overcome the motor's inertia, allowing it to spin up to its operating speed.

Common signs include the motor humming but not turning, or the motor struggling to start and requiring several attempts. If you are comfortable with electrical checks, a technician can test the capacitor's capacitance.

This capacitor is compatible with a specific range of Kärcher models, primarily from the K5, K6, and K7 series. Please check the provided list of model numbers (e.g., K5.91, K6.80, K7.20) against your unit's identification plate.

Installation involves electrical components and requires careful handling. While possible for those with electrical experience, professional installation by a qualified technician is strongly recommended for safety and correct fitting.

The alternative part numbers for this Kärcher capacitor are 6.661-158.0, 66611580, and 66612980.

The key difference is the capacitance rating (40UF) and the specific design for Kärcher pressure washer motors. Using an incorrect capacitance can damage the motor or fail to provide adequate starting power.

This is a common symptom of a failed start capacitor. Ensure the unit is powered and replace the capacitor if it matches the compatible models.

A weakening capacitor can cause this behavior. Replace the capacitor with the correct 40UF part for your Kärcher model.

While a faulty capacitor can sometimes cause overheating and shutdown, this could also indicate other issues like a failing motor or thermal overload. Consult a technician if replacing the capacitor does not resolve the problem.