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HomeRC & Power✈️Aircraft🚁HelicopterRadio - Servo - Gyro - Gov - Batt › Did I wear out my DS650 tail rotor servo?
01-13-2013 10:00 PM  7 years ago
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ticedoff8

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Morgan Hill, CA. USA

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Did I wear out my DS650 tail rotor servo?
I have 2 Align DS650 tail rotor servos
They both are at least 14 to 18 months old and have maybe 100 to 150 flights - maybe more.
They are mounted on Raptor 90 (nitro) and I have used them when the helicopters were flybared and I still use them after being converted to FBL.
They have crashed a few times - but they never seemed to be damaged.

The problem is they are both become very "stiff" when they are powered off. It is like the O-ring is swelled up or the grease has congealed. I am worried that I might be on the verge of total servo failure.

Once they warm up (actually get warm), and I power off, they are back to "normal" for a few minutes.

This is hard to explain.

Normally, when you twist a typical DS650 servo arm back and forth, it is very easy to move, smooth and has a little bit of "momentum" (you can feel it wants to keep going when you try to stop it) once the gears start spinning.

Lately, on my old DS650 servos, there is a lot of resistance. It is hard to start the arm moving, and you can feel a lot of drag. It feels like the grease has congealed or something is dragging internally.

I have opened them up, inspected and cleaned the gear train, lubricated the gears using the Hytech Servo grease and reassembled. But, it hasn't helped.

When I power them up, they seem to move okay - and I have not really noticed any changes in flight. They seem to be just as fast and responsive as ever - once they are powered up. I have not had to adjust gyro gain or any other parameter.

If I hook up my Align multi tested, and set it to servo testing, the servo moves fine with no perceptible problems. After about 5 min on the tester, I can unplug the servo, and it now feels like new - no drag, not stiff. Just easy and smooth.
But, after about 20 min - it is stiff again (like it got cold).

Is this a sign that the motor is warn out?
I cannot take the motor out (that I know of) to clean or lubricate. So, if it is a motor issue, I have to get new servos.

Did I finally wear out my tail rotor servo?
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01-16-2013 01:45 AM  7 years ago
EASYKILL

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Sonora,Ca - US

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I just noticed looking on Ready Heli at the 650, they have a special note that states they do not recommend running them at 6 volts. They say it can cause them to "burn out" prematurely.
Could this have something to do with it?
Hello, my name is Tony and I'm a heli addict...
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01-16-2013 04:23 AM  7 years ago
ticedoff8

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Morgan Hill, CA. USA

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I hear you - but, according to the servodatabase,com
http://www.servodatabase.com/servo/align/ds650
it is rated at 6v.

And, I run the Scott Gray X2 regulator. Its receiver output voltage is set to 5.2. It runs the receiver (and tail rotor servo) and 5.2v.

It isn't burned out - it runs fine, and flys "okay". It is like the motor bearings / bushings are shot. Like it need oil on the motor.
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01-18-2013 01:44 AM  7 years ago
Stephen Born

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USA

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It has been said that servo movement should not be manipulated when powered off. This is a good way to strip them if they "lock up" when not powered up.

If the DS650 runs fine and movement is not inhibited when powered up, leave it alone.

If it was involved in a crash or has been introduced to water, that is another story.
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01-18-2013 02:51 AM  7 years ago
Four Stroker

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Atlanta

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Dry bearings cause a servo to squeak. I replaced a BLS254 after 2 years for this reason. Maybe 500 flights.
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01-18-2013 02:39 PM  7 years ago
ticedoff8

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Morgan Hill, CA. USA

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It has been said that servo movement should not be manipulated when powered off. This is a good way to strip them if they "lock up" when not powered up.
Not to steal my own thread, but we manipulate our servos when they are powered off every time we fold the rotor & tail blades back for storage.
What is bothering me most about this, is that it has changed so dramatically. From smooth and easy to stiff and hard.
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01-19-2013 05:53 PM  7 years ago
JeffKollin

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Jenison, MI

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I had one do the same thing on my x50. After having power for a short time and shut off the servo would be stiff. If i worked the servo back and forth it would loosen back up. I noticed the servo problem when my gyro would power up and the servo would be slower than all my other 650's. I changed it out with new because i have been told that is the first sign of the servo going bad (stiff moving)
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01-19-2013 07:33 PM  7 years ago
dkshema

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Cedar Rapids, IA

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There is not a lot to go wrong that couldn't be easily checked. Gears and teeth are easily cleaned and inspected. The holes in the servo case for the few short posts on which those gears rotate can be checked to make sure they're still round and haven't been elongated or otherwise damaged. Finally, the motor itself should spin freely when the gear train is not installed. The feedback pot shouldn't be a problem, but it is connected to the output shaft and should turn easily when the output shaft is turned. Any bearings, too, are readily checked for bad stuff going on.

-----

Many years ago I had some Futaba S9202 servos installed in a Schluter Champion. After much flying, the heli just rolled over one day at a hover and went in.

When looking for what may have gone wrong with the heli, I discovered that the bottom end bell on the motor had fractured, allowing the motor armature to have some up/down movement. Three out of three servos all had the same fracture. Make sure your motor is not damaged.
-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz
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01-19-2013 08:39 PM  7 years ago
Tyler

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Chicagoland area

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Is the servo full of exhaust oil?Enjoy things that money can buy IF you don't lose the things money can't buy.
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01-20-2013 08:03 PM  7 years ago
ticedoff8

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Morgan Hill, CA. USA

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Not "full", but it is in there. The threaded end of each of the case screws had oil dripping off when I pulled them out and the case seams were coated.
That was my first suspicion - that the exhaust oil had caused the O-ring to swell against the output shaft. But, the O-ring looked okay.

I flushed the internals with the CRC electronics cleaner before I reassembled. But, I didn't re-oil the motor, just cleaned and re-greased the gears.

These servos get a pretty good coating of oil during a day of flying. I towel them off (along with the rest of the heli) at the end of the day.
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