Is my throttle/brake servo fried?????

[Bad LS1]

I have a Hitec HS-5965MG servo for my throttle/brake. While running it yesterday all the sudden I had no brakes! Upon further inspection here's what I found......

When I pull the trigger on my M11 the servo will travel counter clockwise 100% and back to center without any problems for throttle. When I push the trigger forward for brake I get nothing. I removed the servo horn and took the servo out of the radio tray and had it on the table for further testing. I noticed that when I applied the brakes either it wouldn't move at all or sometime it would sputter a little and barely move. It seems like it may be an electrical problem because when it doesn't move there is no buzzing sound. It's just dead. I can tap on the case and it seems to come to life a little.

Next I plugged it into the steering port on my receiver (unplugging my steering servo) to see what would happen when I tried to control it with the steering wheel. This gave better results, If I quickly turned the wheel from 100% left to 100% right and just kept doing it back and forth then it would swing back and forth without a problem. As soon as I tried to go from center and slowly turn it clockwise it's like it would hit spots and just die. The buzzing would stop and there was no response. Tapping on it or turning the wheel left and right quickly seemed to get it to work again.

Since braking only uses about 30% of the clockwise range of motion it seems that is the dead area it lands in. Anyone know what would cause this? Should or can I send it back to Hitec? Sorry for the long post but it was the only way I could explain it!

 

[olds97_lss]

I've had that issue when I had gotten a servo wet... more than once. They have never come back and actually worked reliably again.

What does it do if you turn it slowly the way that doesn't work, then push it with a finger. Does it act like it's working? Mine also had a tendency to just wander on their own after they were warmed up a bit when they were like that. None of mine were digital servos.

I've had the issue with futaba S3305's (2), hitec 645MG's (2 or 3) and a 625MG. I apparently screw around in water too much. Usually it was from snow though.

 

[Bad LS1]

if I tapped on it or messed with it then it would seem to come to life. It would always die in the same spots though. Funny thing is I never got water on it. I've only had to clean my buggy a couple times and I would just spray simple green on it and blow it off with my compressor. The servos only saw a little overspray from the simple green. I tried to keep the electronics dry.

 

[Tweak]

I bought a whole setup from Futaba recently and it went completely bonkers on me. It came with two a receiver, transmitter, and two regular servos.

Problem is, every once in a while the servos just decide to start twitching horribly in random directions. They drain batteries like you would not believe and they just generally never work right.

Moral of the story: If it's broke, call HiTek and play like you have no idea what might have happened (which, you really don't, right??) They will probably give you some good support options and you will find a definite answer to your question in far less time than it would take to get one here, no offense guys.

 

[Bad LS1]

I bought a whole setup from Futaba recently and it went completely bonkers on me. It came with two a receiver, transmitter, and two regular servos.

Problem is, every once in a while the servos just decide to start twitching horribly in random directions. They drain batteries like you would not believe and they just generally never work right.

Moral of the story: If it's broke, call HiTek and play like you have no idea what might have happened (which, you really don't, right??) They will probably give you some good support options and you will find a definite answer to your question in far less time than it would take to get one here, no offense guys.

yeah I will definitely be getting in contact with Hitec. Just wanted to see if this was common or if anyone had any "quick fixes" for something I may have overlooked. I already stopped by my LHS and bought another servo to hold me over until I get this one back. I figured it wouldn't hurt to have a spare on hand for times like this.

 

[jon2]

Have you touched any settings on your radio? Are the ackerman links straight?

 

[Bad LS1]

Have you touched any settings on your radio? Are the ackerman links straight?

settings the same

links are straight

 

[jon2]

Can you manually turn the servo horn and feel any dead spots?

 

[Bad LS1]

no not really. it turns what I would think is normal.

 

[on_my_can_sp2]

It sounds like you might have knock a tooth off on a grear Or you could have a bad bearin or bushin at the top of the servo. It does not sound like anything elec.