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HomeRC & PowerAircraftHelicopterRadio - Servo - Gyro - Gov - Batt › 9254 Servo, Changed gear, FIXED
02-04-2010 01:44 PM  8 years agoPost 1
KingJoeMack

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New Baltimore, Mi USA

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I have a 9254 Servo after a tail in crash, needed gears. Put them in and seems to be fine, after assembling the case and installing horn, there seens to be a flat spot.
Took apart inspected gears, fine. Reassembled with the same results
Is it time for the circular file?

Fly with scheduled ground contact !

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02-04-2010 03:42 PM  8 years agoPost 2
blakka_1

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London/Enfield

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If you have replaced the gears and seated them correctly then could the servo motor be suspect?

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02-04-2010 03:44 PM  8 years agoPost 3
KingJoeMack

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New Baltimore, Mi USA

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Possible, never got into servo that far, What would I look for when I get to motor?

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02-05-2010 01:38 AM  8 years agoPost 4
GMPheli

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W. Bridgewater, MA USA

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What do you mean by a flat spot?

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02-05-2010 01:50 AM  8 years agoPost 5
KingJoeMack

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New Baltimore, Mi USA

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When assembled, I hold the horn and rotate clockwise/counterclockwise. At about the midpoint, there is a spot where it does not go smoothly across. Bind, Speedbump, flat spot, striped gear?
If it was the main servo motor, it would seem that it would give that additional resistiance at more than 1 spot, as the motor turns more than 1 revolution to complete servo travel in each direction.
I checked gears 3 times.

Fly with scheduled ground contact !

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02-05-2010 01:57 AM  8 years agoPost 6
GMPheli

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W. Bridgewater, MA USA

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Possibly a little chip of one of the broken gears stuck in a gear? Or, if you remove the gear that drives the main output gear, does the output gear now rotate smooth? If you feel the flat spot in just the output gear, more than likely the pot is damaged.

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02-05-2010 02:00 AM  8 years agoPost 7
KingJoeMack

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New Baltimore, Mi USA

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Thanks for info, will check it out tomorrow.

Fly with scheduled ground contact !

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02-05-2010 02:48 AM  8 years agoPost 8
Chief_USN

rrKey Veteran

Chesapeake, VA

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Had this same issue on a 9252. I would get the servo all back together and you could hear and feel a click in the output shaft like it was still stripped. Ended up being a small flat spot on the small thin gear that is driven by the motor. Thing was, it was a brand new set of gears out of the package. The flat spot was so minute, that I had to use a 10X magnifier to see it. The way I found it was I took all the gears out and went one gear at a time to see which gear was messed up. Luckily I didn't need to go far to find it. As the flat spot came across the pinion, it would hang up. I then looked at the gear through the magnifier and found the flat spot. replaced the gear and good to go. It did ruin a Sunday of flying when it happened but I didn't want to take a chance of having a servo go out.

Chad

Team HeliProz 12-14
US Navy Chiefs...Unity, Service, & Navigation to the Fleet since 1893

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02-05-2010 03:01 AM  8 years agoPost 9
KingJoeMack

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New Baltimore, Mi USA

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That sound like me.
Time to find the magnifying glass.

Fly with scheduled ground contact !

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02-05-2010 10:00 PM  8 years agoPost 10
KingJoeMack

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New Baltimore, Mi USA

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FOUND IT. It was a bad tooth on a gear, but the top and small piece of the bottom of tooth were there, middle was gone, and it was bent slightly. I put all new gears in, and it was OK, then I repaced them one by one (just because I wanted to know) and when I go to the bad gear, I had to look at it 3 times before I saw it.
This was a learning experiance.
Thanks, at least it did not go in the trash basket.

Fly with scheduled ground contact !

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