Marlo Drive Motor / Gear Train Noise

Softener makes loud clicking or grinding noises during regeneration

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Worn or broken cam gear teeth, Loose drive motor, Foreign object in gear train, Failing motor bearings

How to Fix / Troubleshooting

Safety first: Unplug the unit before removing the control cover. Do not place fingers near moving gears while powered.

Step-by-step checks:

  • 1. Observe operation: Start a manual regeneration and listen to identify when the noise occurs (during indexing between cycles or throughout).
  • 2. Inspect drive assembly: Remove the Marlo control cover and visually inspect the drive motor, cam, and gears. Look for missing or damaged teeth, loose screws, or misalignment.
  • 3. Check motor mounting: Tighten any loose mounting screws. A loose motor can cause gear misalignment and noise.
  • 4. Manually rotate cam: With power off, gently rotate the cam through a full cycle. Feel for rough spots or binding that could indicate debris or damaged parts.

When to replace parts: Replace the Marlo drive motor and gear kit if gears are worn or the motor is noisy. If the cam itself is damaged, replace the Marlo cam assembly.

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Repair Difficulty

Medium 3/5

Required Part

Marlo drive motor and gear kit
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