Astro 05 brushed motor seizes, sizzles & frys
Running an Astro 05 with a 3.3 Astro Superbox
Max trottle drawing 17 amps as shown on wattmeter
Ran it for more than 5 min
I could see a small spark inside the motor every 2 or 3 min but did not think this was a problem
After 7 min of running it suddenly seized, there was a bit of smoke.
When I opened the motor the main spindle where the brushes make contact with the spindle this part had been totally chewed up. One of the black "ears" appeared to have its glue melted and had move position causing the carbon brushes to eat into the spindle. This motor had seized on a previous bench test at a lower throttle but I thought I had fixed the problem by regluing the ears. I am glad this happened on the bench rather than in the air.
Diagnoses - black ear glue mechanical failure
Result - one 05 Astro destroyed
I continue to be a fan of Astro brushed. But this was frustrating.
I believe the part where the carbon bushing makes contact with the spinning shaft have been wrenched out from the shaft along with one of the black ears along with the part of the front golden housing. The only thing left intact is the black casing, the Astro superbox (3.69:1) including the 13T helical pinion, which was undamaged.
I have a replacement motor (never flown Astro 15 cobalt challenger) in my parts bin and will be using this after replacing the stock 2:1 gearbox with my 3.69 SuperBox. However what I need is to borrow a gear puller that will remove the existing factory fitted pinion from the Astro 15. The shaft size is 5/32 inch. The pinion is very tight though. I have tried with a standard GWS after heating the pinion with a blow torch and it still will not budge... the GWS puller jaws broke in the attempt!!
If there is anyone who can lend me / recommend a strong gear puller; or will pull this pinion gear out themselves (at my risk) please let me know. I am also in the process of contacting Kurt at New Creations in Texas to see if he has any ideas for a tight pinion gear.
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