Why does my 18 volt brushless trimmer shut down after 10 min run time
ryobi p2009 trimmer 18v shuts down after 10 minutes with full charge..Is there a heat switch that goes bad or what ?
Mine does the same thing it’s the motor overheating there is a temperature sensor that you will need to by pass to avoid this issue
Here's the fix guys :
The motor driver power supply inside is overheating and will shut down until it cools to a lower temperature. I installed a small computer fan inside (1.5" square) and directed the air flow over the motor driver heat-sink and eliminated the shutting down problem. Now I can run continuous, I can swap batteries all day and it does not stop.
After reading this post - I decided to add two 24volt DC fans.
My goal was to do limited alterations to device, so I may return this after the mowing season for repair. Its brand new and overheated within one hour of use! The unit has a ton of power comparable to my gas Husqvarna.
Here are some pics of my solution.
I cant really give you a detailed parts list as I used items I had in my shop.
I soldered the wires to the (- +) tabs (internally) that come in contact with the 18 volt battery. Then ran the wires out of a vent slot. Used two wire ties to go through vents to secure to the tool with out need to screw into tool. Tool has not overheated since . An alternative to using the rocker switch is to add a Micro Limit Switch Long Hinge inside to start fan when the safety lever is depressed on Ryobi (there is room for a small switch)
BTW I see they have discontinued the unit Homedepot String trimmer
Having had the same problem with my RYOBI P2009 from new I found like others that it was the 'Electronic Controller' part number 311291005 at fault. It has small heat-sink fins either side for cooling. This is mounted directly behind the motor and the design of the plastic handle in this area seems to not allow sufficient airflow for cooling.
To overcome this lack of airflow I just opened up some of the plastic cooling slots that are adjacent to the heat-sink fins. On one side I just left the 1/8 drill holes and on the other side I removed most of the material between the holes. This allows more ambient airflow as you are using the unit to dissipate the heat better. I did this with battery drill and 1/8" drill bit. You need to dismantle the handle, so you do not damage any wiring/components whilst drilling/opening up the cooling slots.
Of course, this would void your warranty as you are modifying the unit. I don't know why RYOBI didn't build it like this in the first place or at least put a second fan on motor to cool the Electronic Controller.
Hope this helps.
See photos below.
Maybe is the battery out of life....
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