McCulloch Blade Brake / Safety Stop Delay

Robot mower blades continue to spin for an unusually long time after lifting or pressing STOP.

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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

Faulty lift or tilt sensor, Sticking blade motor relay on PCB, Software malfunction, Debris preventing quick stop

How to Fix / Troubleshooting

Critical safety warning: If blades do not stop quickly when the mower is lifted or STOP is pressed, discontinue use immediately. Turn OFF the main switch and remove the battery if possible.

  • Test safety functions: In a controlled environment, with protective gloves, briefly start the mower and lift it to confirm blade stop time. It should stop within a few seconds.
  • Inspect sensors: Check lift and tilt sensors for proper mounting and free movement.
  • Check for relay sticking: Listen for a click from the PCB when blades are commanded off. If the motor continues to run, the relay or driver may be welded closed.
  • Do not operate until repaired: Replace faulty sensors or main PCB. This is a critical safety repair best handled by an authorized technician.
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Repair Difficulty

Professional Required 5/5

Required Part

Main Control PCB
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