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HomeAircraftHelicopterRadio - Hitec Aurora › Hitec help
01-21-2010 03:47 AM  8 years agoPost 1
Sean Bosse

rrApprentice

Germantown, MD.

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Hey guys,

I have a Trex450 with HS65mg's on cyclic. My issue is that I had a crash and managed to strip one of the crown gears on the HS65mg. I bought a hitec gear set and replaced them but now the servo runs significantly slower than the other two. This isn't the first time this has happened to me with these. It happened the last time I wrecked but I disassembled the servo a couple of times and then it worked normally. This time, it seems no matter how many times I disassemble/reassemble the servo, its still slow. I can feel the higher drag when I spin the servo crown-gear so I know its not the motor. Anybody have any ideas?

Thanks,
Sean

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01-21-2010 04:43 AM  8 years agoPost 2
Heli 770

rrProfessor

USA.

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Have you tried backing off on the case screws, sometimes you can get them too tight and it will bind the gears in the case.

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01-21-2010 05:05 AM  8 years agoPost 3
Sean Bosse

rrApprentice

Germantown, MD.

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Thank you Heli770. I tried that, but it didn't seem to help much. I'm stumped.

Sean

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01-21-2010 05:16 AM  8 years agoPost 4
Heli 770

rrProfessor

USA.

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Besides the gears are you lubing the shafts that the gears spin on. BTW that are you using for servo lube?

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01-21-2010 12:31 PM  8 years agoPost 5
Sean Bosse

rrApprentice

Germantown, MD.

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I am lubing them, however I used normal light diff grease. You think that could be the cause?

Thanks,
Sean

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01-21-2010 01:38 PM  8 years agoPost 6
Heli 770

rrProfessor

USA.

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You need to use a silicon based grease. The Hitec stuff I use is a lot lighter(lower viscosity)than regular grease. Hitec also warns about using regular grease encased in a servo will create gasses that will put a film on the motor brushes, causing the motor to go bad.

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01-21-2010 08:11 PM  8 years agoPost 7
Sean Bosse

rrApprentice

Germantown, MD.

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Thank you Heli 770! I'll tear it down in the next few days and try a diff. grease.

Thanks for the help,
Sean

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01-21-2010 09:03 PM  8 years agoPost 8
Dr.Don

rrVeteran

Cedar Park, TX -- USA

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Sean,

Using the wrong grease may have a long term affect as mentioned above, but that isn't going to affect what you are seeing now. For the immediate problem, grease is grease. And since you used some, it's not your problem. I suspect either the wrong gear set (unlikely but possible), improper assembly resulting in something binding (possible), or some crash damage to the motor/amp board (also possible). A servo can be bound in a stalled condition in a crash and draw the stall-level current until the battery is unplugged. That can overheat things and damage the motor and/or amplifier board.

If you change grease and it magically works, it is going to be because your last assembly was correct, not because of the grease type.

Dr.Don

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01-21-2010 10:40 PM  8 years agoPost 9
Sean Bosse

rrApprentice

Germantown, MD.

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Thanks 2atlo8, good point.

Sean

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