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100 Class Electric Helicopters 100 Class Electric Helicopters manufactured by Align, Tarot, SYMA, Airhog, Chaos, HK and similar.


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Old 05-01-2020, 10:08 PM   #1 (permalink)
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Default How to replace spur gear on k110?

Does anyone know an easy way to install the little spur gear onto the motor shaft on the xk k110? Seems like a very tight fit. Somehow the stock one got loose and started sliding from the main gear. Didn't think that was possible
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Old 05-01-2020, 10:14 PM   #2 (permalink)
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They are sort of the safety valve on the K110. Use a knife to gently pry the old one off. Notice the notch in the hole and shaft, line them up, be careful not to push on the blade grips.
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Old 05-02-2020, 07:20 AM   #3 (permalink)
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Originally Posted by RustyChain View Post
They are sort of the safety valve on the K110. Use a knife to gently pry the old one off. Notice the notch in the hole and shaft, line them up, be careful not to push on the blade grips.
I'm referring to the motor spur gear, not the plastic main gear.
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Old 05-02-2020, 07:33 AM   #4 (permalink)
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Originally Posted by bpjacobsen View Post
Does anyone know an easy way to install the little spur gear onto the motor shaft on the xk k110? Seems like a very tight fit. Somehow the stock one got loose and started sliding from the main gear. Didn't think that was possible
Clean the shaft and gear with some meths then use a toothpick to put the smallest dab of loctite retainer on the tip of the shaft and slide the pinion into place with a twist. I've just had the same problem myself but with a bigger motor and it's holding up ok.

Last edited by evolusia; 05-02-2020 at 08:10 AM..
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Old 05-02-2020, 08:34 AM   #5 (permalink)
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Originally Posted by bpjacobsen View Post
Does anyone know an easy way to install the little spur gear onto the motor shaft on the xk k110? Seems like a very tight fit. Somehow the stock one got loose and started sliding from the main gear. Didn't think that was possible
Oops, I re-read your post and it looks like you might have lost the old one so you have a different problem. It's a very thin shaft and it's going to bend if you use any force incorrectly. You need to support the motor so it's secure, I would use a wood bit to make a hole in an off cut and drop the motor into that, use some tape around it if it's a bit loose, then heat the pinion up. I would use the oven or a pencil torch, then when it's up to temp quickly drop it onto the motor shaft using something light weight like a pair of tweezers so you don't soak the heat out. If it freezes before it's right home you will need carefully press it the last bit with a vice. If it does go right home first time quench the the assembly with a damp cloth to stop the heat going into the bearing. Just my ten cents.
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