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new hs 81

Old 04-05-2004, 11:38 AM
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dershark3
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Default new hs 81

Hi Mike,

I just purchased two new HS 81 servos from my LHS. Not the MG version.
I am getting the buzzing (not centering) problem.
I am testing using direct servo control so I know it's not an interference issue.
I disconnected the linkage and even removed the servo arm.
With just the slightest pressue from my fingers on the nylon post, it will not center and continues to buzz even after I remove my fingers.
Sometimes it buzzes at center without finger pressure.
I even tried backing off the torque on the case screws but that did not help.
The battery is a new fully charged 1100Mah so I'm sure there is no current supply problem.
The up and down play (movement) of the nylon post seems very stiff (binding).
Both servos have the same problem.
It would seem that there is a bind in the servos somewhere - the bearings or the geartrain.

What do you suggest?
Thank for your support!
Old 04-05-2004, 02:52 PM
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dershark3
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Default RE: new hs 81

I found the problem!!!
I took one apart and found that the final output shaft had a nick in it just about where the final output gear rides.
This is why it was so stiff to move the post up and down throughout it's vertical play.
I will try to sand down the nick with some 400 sandpaper.
It looks like a manufacturing defect.
By the way - with a 10x magnification jewlers loupe, the shaft surface looks ridged. Not smooth.
I'll let u know how the nick removal worlks out.
Old 04-05-2004, 03:53 PM
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dershark3
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Default RE: new hs 81

I was wrong.
The nick had nothing to do with the problem since that shaft turns with the gear.
It just was binding the up and down free play.
But when I try to move the gear train from the motor pinion every 3 or 4 motor revolutions can definetly feel a spike in resistance like a tooth binding somewhere in the gear train.
Also looking at the gear train from the side the final gear looks crooked.
I tried running it for a while, sort of trying to break it in.
It just got hot and the problem was even worse.
So I don't know what to do, except ask hitec.
Mike Mayberry is not available for questions anymore at Ask Mike.
Old 04-05-2004, 09:45 PM
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mglavin
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Default RE: new hs 81

Mike is out of town. I was commissioned to stand guard in the mean time...

Return the servo to your local hobby shop for an exchange or forward it to Hitec service for a free replacement. Unfortunately it’s not a perfect world and stuff happens...
Old 04-07-2004, 02:20 PM
  #5  
dershark3
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Default RE: new hs 81

Hello mglavin,

I took them back to the LHS where I bought them and they said they are fine and won't replace them.
I had some protective covering on the wires ( shrink wrap ) and they say this has voided the warranty!
They tested with a 6V alkaline battery on the Rx.

I'm not sure what to do now.
Many people tell me the buzzing at no load center is normal and many people tell me it's not normal.
Really confused.
Thanks for any help.

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