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HelicopterMain Discussion › Question on a 9252- Young Buck vs Old Fart
03-16-2009 06:20 PM  8 years agoPost 1
Frank Bostwick

rrElite Veteran

Cincinnati Ohio

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I bought a used set of 9252s a year ago or so from a respected RR member. I finally got them in the air the other day. Today I was doing some work on the bird and I noticed one of them, when dis connected from the swash, felt like it was totally stripped, I mean I grabbed the P/R and moved it up and down, the spline moved but felt like it connected to nothing, ZERO resistance. The others you can hear gears moving and there is some resistance. Power it up and it seems to work fine. I offer "strong" resistance with my fingers and it works with out problem.
So whats up with that?

RIP ROMAN

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03-16-2009 06:23 PM  8 years agoPost 2
Dood

rrProfessor

Wescanson

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Don't assume the gears are intact.

Open it up and inspect the gears. It takes a minute. That will help eliminate the guessing game.

  ▲
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03-16-2009 06:25 PM  8 years agoPost 3
HydroJoe

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SF,CA

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That does sound strange. I have never seen or heard of that with any servo. If I were you, I would take it apart and have a look at the gears.

T-Rex 450 SE V2 , T-Rex 600 NSP, Stryker F27 C....Yea, it's a plank.

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03-16-2009 06:48 PM  8 years agoPost 4
Swoop

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Newark, DE USA

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If I were you, I would take it apart and have a look at the gears.
+1; wouldn't fly it till then

Chris
X50, B320, Radix, Spartan
Titan,Kasama,MP5,Radix,JR770
Trex450SE,MavrikkG5,Phoenix35

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03-16-2009 07:02 PM  8 years agoPost 5
Frank Bostwick

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Cincinnati Ohio

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Agreed.........grumble grumble grumble....

RIP ROMAN

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03-16-2009 07:28 PM  8 years agoPost 6
Wingman77

rrProfessor

Pulaski Tennessee

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it's not that bad..

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03-16-2009 07:41 PM  8 years agoPost 7
dirtkiller

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Oregon

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I agree it is a lot easier to check the servo now than rebuild the heli later

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03-16-2009 07:49 PM  8 years agoPost 8
Frank Bostwick

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Cincinnati Ohio

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I agree this build has been one thing after another. If there is one thing this hobby REQUIRES its
Patience
Ive got alot more of that then money

RIP ROMAN

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03-16-2009 09:04 PM  8 years agoPost 9
Leif

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USA

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The only time I ever saw a S9252 do that was after a crash. In that case, the shaft of the large main gear cracked off.....

Fortunately gear sets are fairly easy to replace. The only pisser is removing the bearings from the main gear and installing them on the new one without damaging anything.

Leif

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03-16-2009 09:27 PM  8 years agoPost 10
Jag72

rrProfessor

South of Boston

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Gears...

They are easy and cheap to fix man...cost is about 5$ on them...I would check the servo out anyways...it only takes a minute to look inside

If you need a gear set...I can get you one here locally as well..

Anthony

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03-16-2009 09:49 PM  8 years agoPost 11
Chickenrun

rrVeteran

Lincolnshire England​UK

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ZERO resistance
If no gears are broken, then it's good bye servo motor unfortuately

Cheers

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03-16-2009 09:50 PM  8 years agoPost 12
"Cam"

rrKey Veteran

UK

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If there's one tooth missing from the gear that drives the output gear and the servo was powered-down in that position, then the output can be moved freely. As soon as you power-up the servo and the motor moves the gears the other teeth will re-engage.

I'd open it up before tooth debris causes any more damage!

Tell us what you find!

DSX9
EMax V2
http://runryder.com/helicopter/gallery/37491/

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03-17-2009 04:35 AM  8 years agoPost 13
jschenck

rrProfessor

La Vista, NE.

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could also be the wrong servo wheel. try one of the servo wheels from one of the other 9252's. If it is a broken gear they are easy to replace.

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03-17-2009 11:20 AM  8 years agoPost 14
Frank Bostwick

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Cincinnati Ohio

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Requested Update: one gear is missing a tooth.

So heres the next question: After very carefull inspection, all the gears are in very good shape except one. The gear that is broken is an EXACT match to a gear I have in a gear set for a 9253.

Should I use that new gear and fly today or order a new set (will happen in any case)and wait for its arrival? I lean to waiting but the new gear will work.....

RIP ROMAN

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03-17-2009 11:43 AM  8 years agoPost 15
Frank Bostwick

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Cincinnati Ohio

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Dang it, never mind I'll wait. Oh THATS why I need 3 helis

RIP ROMAN

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03-17-2009 12:25 PM  8 years agoPost 16
"Cam"

rrKey Veteran

UK

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Told Ya!

I'm sure the two servos have the same gear sets, now I've replaced single gears before but it might be better to change the entire set, especially on good servos. (?)

DSX9
EMax V2
http://runryder.com/helicopter/gallery/37491/

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03-17-2009 12:38 PM  8 years agoPost 17
Frank Bostwick

rrElite Veteran

Cincinnati Ohio

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I went ahead and put it in and re assembled it, feels good BUT always an F in' But. Hate to loose a heli for a $8 part. Now Ill have to see just how good my will power is......

RIP ROMAN

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03-17-2009 12:42 PM  8 years agoPost 18
jschenck

rrProfessor

La Vista, NE.

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I know for a fact some gears interchange between different servo models. If that gear was the same size and same number of teeth I wouldn't worry about it.

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03-17-2009 01:47 PM  8 years agoPost 19
Frank Bostwick

rrElite Veteran

Cincinnati Ohio

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Its the same, I compared, measured and counted. Heres the deal, to me anyway.
Im in a hobby over my pay scale. It took me a long time to get 3 birds ready for the flight line. We all know that we get what we pay for, especially in this hobby. I had already decided not to buy used servos again, just too many unknowables.
Just me putting it together shows that I am predisposed to use it, I WANT to use it, chances are it will be fine. As always
BUT
No matter how closely I inspected the other gears, there could be stress and or cracks that I can not see or feel until in the air. So me rushing to the air and saving $8 could cost me a much larger expense.
So
Im left with the impulsive side saying, "GO FOR IT" and the other side urging caution, asking for patients.

Honestly I dont know what Ill do, its sure no big deal (unless I total it). I do have 2 other helis ready willing and able but I have been working on this one some time and Id sure like to see her flying trimmed and reliably. No way around it, the safest course is to get the right gears.

So whos gonna win, the youth still left in me or the wise old fart Im quickly becoming?

RIP ROMAN

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03-23-2009 02:54 PM  8 years agoPost 20
Frank Bostwick

rrElite Veteran

Cincinnati Ohio

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Well the old fart won out. I had put the servo back together with the 9253 gear. It did not feel as smooth as the others (servos). Since I have 2 other helis ready to fly I decided not to fly it and wait for the gear packs.
This morning I took the servo apart and what do you know, after inspecting the main black gear underside I saw it to was broken. 2 cracks way on the inside, hard to see but almost cracked thru.

Had I flown that servo a crash would have ensued.

So chock one up for old farts.

RIP ROMAN

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HelicopterMain Discussion › Question on a 9252- Young Buck vs Old Fart
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