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Old 01-18-2009, 06:54 PM   #1
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Default Steering Servo Failure?

I bought 2 used JR9000 Steering servos I was under the impression these are good servo's for 1/8 steering. Today at the Tack It looks like I toasted both of them. When I turn the TX on the Motor just spins and won't stop. I took the servo's apart and see nothing wrong with them. Did the motors go bad? Any good recomendations?
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Old 01-18-2009, 07:02 PM   #2
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i use the 9000s on steering myself. i've burnt up two so far, one horizon replaced no questions and i'm sending in the second one tomorrow to get fixed. they don't make them any more so i hope they will replace it with a 9100s.
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Old 01-18-2009, 07:31 PM   #3
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if the servo motor's are spinning and nothing is happening you damaged the gears....there must be some teeth missing that you didn't see.
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Old 01-18-2009, 07:56 PM   #4
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I had a 9000s do that from brand new out of the package & that was one that was sent out to replace the one I sent in for the recall they had a while back. They sent a 9001s as a replacement.Never had a problem with any of my "T" versions that wasnt caused by long time abuse.Too bad you took yours apart they probably would have warrantied it,but still may,call them. I would suggest using the "T" version for steering though. I've only had luck with 1 of the 5 "S" versions I have & pretty much wont use them anymore.
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Old 01-18-2009, 08:06 PM   #5
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I call it the JR death rattle! normally I have had en last for 2-3 months, and then, bam.. wont center, I still run JR's, The warenty cannot be beat, but like above, do not mess with it, let them figure out whats wrong! I did have a good buddy of mine tell me to get rid of the 9000 s series, Said it was tooo fast, go with the 9000 t, There is some truth to be told there...
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Old 01-19-2009, 08:13 AM   #6
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if the servo motor's are spinning and nothing is happening you damaged the gears....there must be some teeth missing that you didn't see.
I get what you are saying. Let me clarify a little better. When you turn the servo on (assembled) you can hear the motor winding. I took apart both servos since they both have the same issue. The grears are 100% I inspected them very well. The motor has a small gear on the shaft that sits inder the case when you put power to it it simply spins full speed. When it was assembled it it doing the same thing but since a servo has a stop point it's just makes the sound and you can turn it back to the left to it's opposite start point.
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Old 01-19-2009, 08:30 AM   #7
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Quote:
Originally Posted by butch man View Post
I had a 9000s do that from brand new out of the package & that was one that was sent out to replace the one I sent in for the recall they had a while back. They sent a 9001s as a replacement.Never had a problem with any of my "T" versions that wasnt caused by long time abuse.Too bad you took yours apart they probably would have warrantied it,but still may,call them. I would suggest using the "T" version for steering though. I've only had luck with 1 of the 5 "S" versions I have & pretty much wont use them anymore.



huh no warranty from opening up the servo ? where do you get that from ?


everyjuangohome....if the motor's spinning(you can hear it)..and NO gears are moving....Something has to be stripped....or the mini pinion on the motor is loose or something...but thats how i see it
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Old 01-19-2009, 08:48 AM   #8
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huh no warranty from opening up the servo ? where do you get that from ?


everyjuangohome....if the motor's spinning(you can hear it)..and NO gears are moving....Something has to be stripped....or the mini pinion on the motor is loose or something...but thats how i see it
Im not sure you get what im saying. The motor spins the moment you power it up? It does not stop!!! just spins Im trying to see if this means the motor is jacked up. I bought these used from a member on here. He sold me one with a broken case and failed to mention that. He shipped me a new case so either way I had to open it to repair the broken mount on the case. I have the servo totally pulled apart Im holding the motor in my hand when I power it zzzzzzzzz it spins. Obviously if I had it put together it would spin hit the end point and continue to go zzzzzzz and fry the servo.
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Old 01-19-2009, 09:21 AM   #9
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when you blow a gear set...your main gear (what you bolt your servo horn onto) is what controls the way the motor spins.....center it...and the motor's will stop zzzzzzing....turn it left the motor turns gears (or should) If the gears are stripped...but if they aren't...i dont see anything that would prevent the servo from working normally....Stuff like this is Sooo much easier in person to diagnose.


FYI opening a servo does NOT void the warranty.
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Old 01-19-2009, 09:32 AM   #10
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when you blow a gear set...your main gear (what you bolt your servo horn onto) is what controls the way the motor spins.....center it...and the motor's will stop zzzzzzing....turn it left the motor turns gears (or should) If the gears are stripped...but if they aren't...i dont see anything that would prevent the servo from working normally....Stuff like this is Sooo much easier in person to diagnose.


FYI opening a servo does NOT void the warranty.
LOL. Yes I agree, always easier in person. I guess I might Just send them back in. Are the Losi Truggies hard on steering servos. What is start and stop point adjustments. I thought you just centered your steering put the horn on used the sub trim to get it straight and you were good to go.
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Old 01-19-2009, 10:25 AM   #11
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horizon definetlry has an awesome warranty on stuff.. i have sent servos back to them a few times with zero question asked!
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Old 01-19-2009, 10:41 AM   #12
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You need to set your EPA for steering and throttle.
Your travel in linkage will be less than the full range of the servo. If you don't it will put the servo in a bind.
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Old 01-19-2009, 10:55 AM   #13
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You have never said if the 9000 servos were T or S..and yes it Makes a HUGE difference..If you use a 9000S in your Buggy or Truggy for steering you will burn it up..128oz/in is NOT enough Torque..especially for a Truggy.. remember..proper tool for the job..
9000S Digital High Speed/Torque Surface Specs
Size Category: Standard
Type: Digital
Torque: 112 oz/in @ 4.8V, 128 oz/in @ 6V
Speed: .08 sec/60° @ 4.8V, .06 sec/60° @ 6V
Dimensions (WxLxH): 0.83" x 1.59" x 1.50"
Weight: 2.2 oz
Gear Type: Metal

9000T Digital Ultra Torque Surface Specs
Size Category: Standard
Type: Digital
Torque: 291 oz/in @ 4.8V, 320 oz/in @ 6V
Speed: .18 sec/60° @ 4.8V, .15 sec/60° @ 6V
Dimensions (WxLxH): 0.83" x 1.59" x 1.50"
Weight: 2.2 oz
Gear Type: Metal
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Old 01-19-2009, 11:42 AM   #14
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Quote:
Originally Posted by Oasis View Post
You have never said if the 9000 servos were T or S..and yes it Makes a HUGE difference..If you use a 9000S in your Buggy or Truggy for steering you will burn it up..128oz/in is NOT enough Torque..especially for a Truggy.. remember..proper tool for the job..
9000S Digital High Speed/Torque Surface Specs
Size Category: Standard
Type: Digital
Torque: 112 oz/in @ 4.8V, 128 oz/in @ 6V
Speed: .08 sec/60° @ 4.8V, .06 sec/60° @ 6V
Dimensions (WxLxH): 0.83" x 1.59" x 1.50"
Weight: 2.2 oz
Gear Type: Metal

9000T Digital Ultra Torque Surface Specs
Size Category: Standard
Type: Digital
Torque: 291 oz/in @ 4.8V, 320 oz/in @ 6V
Speed: .18 sec/60° @ 4.8V, .15 sec/60° @ 6V
Dimensions (WxLxH): 0.83" x 1.59" x 1.50"
Weight: 2.2 oz
Gear Type: Metal

Doh!!! it was the S
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Old 01-19-2009, 02:32 PM   #15
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I would send them back..dont tell them what you did with them....get them repaired and then get the 9100T servo and you'll be good to go..
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