Originally Posted by
JPMacG
Sorry, I did not check back until now. Two of them I was running them on 6 volts (a 5 NiCd cell pack). They were rated for 6 volts. They were HS-225MGs. I don't recall what voltage I had on the third one that failed. It might have been 4.8 or 6 volts.
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The only Hitec servos I have had fail were the HS-225's about 4 years ago. Two of my flying friends also had failures of the HS-225. All were motor brush failures, the brushes appeared wear excessively in fairly short operating time probably from over heating. If you had 5 cell pack you were probably over 6 volts coming off the charger.
We replaced the motors (appeared to be a new design) with new ones and no more failures.