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HomeAircraftHelicopterHelicopter Main Discussion › replacing my old servo
01-05-2015 08:10 PM  3 years agoPost 1
pit

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Cleveland, OH USA

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Hello! I am replacing my old cyclic servos, I have an Align Trex 450 Pro with a 3gx gyro and an ar8000 rx. Can somebody tell me the steps electronically? Do I just turn the tx on, plug the new cyclic servos, and plug the heli battery?
thank you in advance..

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01-05-2015 08:17 PM  3 years agoPost 2
wc_wickedclown (RIP)

rrProfessor

long beach calif

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yes put your throttle at mid stick and put the servo horn back on in the 90 position with the heli powered up with the motor unplugged

Insha Allah made in america

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01-05-2015 08:22 PM  3 years agoPost 3
pit

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Cleveland, OH USA

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replacing my old servo
Thanks WC, so I will put my Throttle at mid-stick after I plugged everything on, then put the horns at 90?

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01-05-2015 09:44 PM  3 years agoPost 4
wc_wickedclown (RIP)

rrProfessor

long beach calif

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correct unplug two bullet connectors from the motor to esc first

Insha Allah made in america

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01-05-2015 11:17 PM  3 years agoPost 5
nappyroots2182

rrElite Veteran

Moline, il

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no servos are the same. even if u replace with the same as what u currently have. yes put the horns back on with the stick centered. but u will have to subtrim them to get them horizontal again. plus go back and double check the pitches.

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01-05-2015 11:29 PM  3 years agoPost 6
wc_wickedclown (RIP)

rrProfessor

long beach calif

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nappyroots2182
no servos are the same. even if u replace with the same as what u currently have. yes put the horns back on with the stick centered. but u will have to subtrim them to get them horizontal again. plus go back and double check the pitches.
if he is replacing the servo with the exact same servo

if he did like i recommended he will see the arm will fit perfect with out any subtrim

ive never had to subtrim any.

but if his throttle is at mid stick and the horn goes on 90 why would he need any subtim.

hopefully he will reply and tell us if he had to use subtrim and did the horn fit like a glove 90 with out any trim

Insha Allah made in america

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01-05-2015 11:32 PM  3 years agoPost 7
nappyroots2182

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Moline, il

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i have never had any single servo the same. if your arms drop right on in the same spot you are very lucky. i can take 10 of the same servos and one arm and they all be slightly different. mark location of the arm at half stick on the old servos then replace the servo. use subtrim so the arm drops back on it that same spot.

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01-05-2015 11:37 PM  3 years agoPost 8
wc_wickedclown (RIP)

rrProfessor

long beach calif

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nappyroots2182
i have never had any single servo the same. if your arms drop right on in the same spot you are very lucky. i can take 10 of the same servos and one arm and they all be slightly different. mark location of the arm at half stick on the old servos then replace the servo. use subtrim so the arm drops back on it that same spot.
i have and so have my friends.

lets see what pit says

Insha Allah made in america

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01-05-2015 11:39 PM  3 years agoPost 9
dkshema

rrMaster

Cedar Rapids, IA

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Replace the servos. Nothing magic here.

However, if you change brands, you may find that the servos you just installed don't turn the same direction for a given command as the ones you replaced. JR servos will turn CCW when Futaba servos turn CW, for example, in the same installation. This will require that you perform a new, from the ground-up setup of your TX model memory and FBL controller.

Going back through a proper setup of your heli will guarantee it still flies well after a major component change and really doesn't take too long. You can go through the quick setup now, or later, when you figure out things just don't seem like they used to be.

-----
Dave

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

Team Heliproz

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01-05-2015 11:44 PM  3 years agoPost 10
pit

rrNovice

Cleveland, OH USA

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I have read both of your replies WC and Nappy thank you. I am going to use a different brand of cyclic servo and it's a better servo than my current based on what I've read and researched.

Will there be a big difference using other brand in case there's a diff like Nappy said? I think, I can just put the tx on mid-stick 50-50 and let the horn(s) find the 90deg-centered? I can be wrong but seems to work that way? Pls correct me.

ps yes I will still check the pitch.

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01-05-2015 11:48 PM  3 years agoPost 11
nappyroots2182

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Moline, il

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still fire up the radio at half stick and get ur new servos mounted. u will probaly need to change to the arms that came with the new servos so make sure u place the balls at the same distance from center of the servo arm as where they are now. reset the subtrims in ur radio and see if ur arms drops on. if they do u got lucky mine never do. use subtrim to get the arms to drop on where they are suppose to be. after that go back through setup. easy stuff just double check everything. different brand maybe need the servo channels reversed. check the direction of the servos before using subtrims to get the servos centerd

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01-05-2015 11:49 PM  3 years agoPost 12
nappyroots2182

rrElite Veteran

Moline, il

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what servos are you using

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01-05-2015 11:50 PM  3 years agoPost 13
pit

rrNovice

Cleveland, OH USA

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Replace the servos. Nothing magic here.
However, if you change brands, you may find that the servos you just installed don't turn the same direction for a given command as the ones you replaced. JR servos will turn CCW when Futaba servos turn CW, for example, in the same installation. This will require that you perform a new, from the ground-up setup of your TX model memory and FBL controller.
Going back through a proper setup of your heli will guarantee it still flies well after a major component change and really doesn't take too long. You can go through the quick setup now, or later, when you figure out things just don't seem like they used to be.
-----
Dave

Thanks Dave. I am using a 3gx gyro and will use a diff brand of servos for my cyclic, so I need to reset everything, like a new model on my tx, then do the DIR set up?

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01-05-2015 11:55 PM  3 years agoPost 14
pit

rrNovice

Cleveland, OH USA

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what servos are you using

mks ds95(hitec 5065mg is my current) using an Align 3gx with dx8 tx if that helps..

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01-06-2015 12:01 AM  3 years agoPost 15
wc_wickedclown (RIP)

rrProfessor

long beach calif

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i didnt know he was changing servos

thanks guys

your in good hands pit they got you

Insha Allah made in america

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01-06-2015 12:30 AM  3 years agoPost 16
dkshema

rrMaster

Cedar Rapids, IA

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Pretend you have a new heli. Since pushrods are already built and you have flown the heli before, the mechanical setup won't change much, if at all. In DIR mode make sure the swash is level at mid stick and that you have zero degrees pitch. Make sure he servo arms are properly centered at the zero degree setting.

It may be that the hole placement on the new servo arms is different (spacing, distance from center) so double check your overall pitch range and make sure you still have 8 degrees of cyclic.

Leave DIR mode, and complete the four steps to remind the 3GX of the aileron and elevator travel limits and the correct movement of the swash.

Sounds like a lot of work, but it took longer to answer this from my smartphone than it will for you to do the basic setup

-----
Dave

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

Team Heliproz

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01-06-2015 01:10 AM  3 years agoPost 17
pit

rrNovice

Cleveland, OH USA

My Posts: All  Forum  Topic

Pretend you have a new heli. Since pushrods are already built and you have flown the heli before, the mechanical setup won't change much, if at all. In DIR mode make sure the swash is level at mid stick and that you have zero degrees pitch. Make sure he servo arms are properly centered at the zero degree setting.
It may be that the hole placement on the new servo arms is different (spacing, distance from center) so double check your overall pitch range and make sure you still have 8 degrees of cyclic.
Leave DIR mode, and complete the four steps to remind the 3GX of the aileron and elevator travel limits and the correct movement of the swash.
Sounds like a lot of work, but it took longer to answer this from my smartphone than it will for you to do the basic setup
-----
Dave

Sir Dave,

Yes, It's going to take time doing it, I know what you mean by that been there hundreds of times already LOL, well that's what this hobby is... Now it's clear to me that I have to reset everything again. Sorry about the smartphone thing, but Thanks a Lot Sir Dave, WC and Nappy...

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01-09-2015 04:49 PM  3 years agoPost 18
wc_wickedclown (RIP)

rrProfessor

long beach calif

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your welcome brother

Insha Allah made in america

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