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Topic # 226062 18-Dec-2017 19:19
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Sensor ?switch? in Hedge trimmer


there are two ? sensors ?cutout ?? adjacent to the motor in the hedge trimmer body.


Out of the shrinkwrap


This one, here stripped of its shrink wrap was  placed  close alongside the motor They are approx 6--7 mm diameter.


The coiled wire is continuous and has 3 turns around the "pin in the end of the iron slug


Is it supposed the cut off with excess current?


I ask because the trimmer stops working after around 30 seconds to a minute and the resumes after a :cooling period of a minute or so under light load. The motor also stops if the trimmer is held upside down resuming when turned upright again.  There are no obvious loose connections and it they all show continuity when the trigger is switched on.     .

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303 posts

Ultimate Geek
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  Reply # 1921535 18-Dec-2017 22:04
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Whats the model number?


Sounds like the either the thermal cutout is damaged, or you have a worn or lose brush. 

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  Reply # 1921553 18-Dec-2017 22:23
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Thanks for the input.


The trimmer is an RHT 6060 RS. I have a parts list which does not give a description of, or list the sensors/cut outs, and  most interestingly, does not show brushes, though they are removable. Techtronics advises that if the brushes wear out you need buy a complete motor module just for just $20 short of the cost of a new hedge cutter and not available unless ordered for import. Talk about planned obsolescence! 


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Ultimate Geek
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  Reply # 1921558 18-Dec-2017 22:38
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If it is under 2 years old, see if you can get it replaced under warranty. Most Ryobi garden tools have a 2 year warranty. 

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  Reply # 1921563 18-Dec-2017 22:45
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Sadly it is Two and a half years old and only cut the hedge 4 times. It has good power when its going and looks clean and reasonably solidly built  inside.

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Ultimate Geek
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  Reply # 1921567 18-Dec-2017 22:54
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I also have a Ryobi, a RGT420D, Its about 10 years old, done about a 100 hours work so far and still going strong (Touch wood). They don't build them like they use too :)

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Uber Geek
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  Reply # 1921575 19-Dec-2017 01:49
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Those things look like RFI suppression chokes. Meaning they are unlikely to affect the operation of the motor. If there is a thermal cutout, it would probably be inside the motor itself.

Does operating it no load cause it to cutout?

Are the brushes accessable? Check they can move freely and the springs that push on the brushes are working.

If you have one of those plug in power meters, use it to check the power draw without any load on the motor. As if it is higher than the rated power usage. it's a sure sign that the stator windings have shorted turns. Which causes the motor to heat up excessively. If this is the case, either bin it. Or if you like living dangerously, bypass the cutout and use it until it completely destroys itself.

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  Reply # 1922217 19-Dec-2017 23:24
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Thanks for the advice.


I have checked the brushes and springs are quite strong and the brushes slide freely. 


I checked the current draw with no load and it is under 3 amps but turning the trimmer upside down still cuts the power.


Capsizing it It did not cut continuity when tested with meter while i had it opened up. I have checked all accessable connectors and they appear sound so it is maybe a break inside the motor coils.  I woke  sleeping family members testing in the house so a further test out on the hedge is posponed until tomorrow.  



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