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Old 01-10-2005, 11:26 PM   #1
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Default Burned Out 2 Throttle Servos....Any Ideas??

Well im a little frustrated to say the least. In the last 10 years ive never had a problem like this, so any thoughts would be appreciated. I have been running my mugen MRX for a few weeks now, about a week ago my throttle servo went out, and by went out it didnt completely stop working it just starting working extremely slow, with no load or servo horn conencted. To verify it was a servo probem and not the reciever or Batt, i hooked another servo up and it functioned fine. i bought a brand new hitec 645mg servo and installed it. I adjusted the servo, set the endpoints and ensured easy movement, then it was off to the track again. After about 45 minutes worth of driving i noticed a slow throttle response, i pulled the car back in and again the same problem. I once again checked the reciever by conencting another servo and that servo functioned fine........So im thinking one of three things.

1. the reciever is at some point fowing too much amperage or current to the servo essentially burning out the motor

2. possibly a small amount of fuel is getting in (Even though i took much procaution in fueling to make sure this didnt happen)

3. Some vibration from the car is causing internal damage to the servo.

Any other ideas or suggestions would be great, as i said they dont completely stop working they just move extremely slow (like full travel in 2 seconds). Thanks for any help
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Old 01-11-2005, 02:02 AM   #2
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After 45 minutes of driving you might get a slow servo response due to your battery getting low on voltage.

How is the steering servo?

Also do you use ABS brakes. This sometimes leads to premature servo failure.
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Old 01-11-2005, 11:07 AM   #3
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Default 645mg

For some reason I have had the same problem with that servo,check to make sure your return spring does not have to much tension. Change to a different servo # such as hitecs econo digital and the problem goes away.I use all KO now after repeated hitec problems although I have heard they resolved all the problems with their digitals
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Old 01-11-2005, 12:04 PM   #4
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I do not know what servo initially failed, but I agree with the other guy. The 600 series Hitec servos use a 3 core motor that is prone to failure, especially when stalled which is what happens when you hit the brakes. Stalling also happens if the endpoint on the full throttle is not set correctly. If you want to use Hitec for a throttle servo, then get one of the coreless servos. I would not use a digital on throttle as they too are prone to a higher failure rate when stalled. Either way, if you want to use a Hitec for that application, try a 925.
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Old 01-11-2005, 11:29 PM   #5
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BG: It wasnt battery voltage as i stated the steering servo and other servo i plugged in both operated normally, and i was not using ABS

trashcar: During that session i wasnt using a return spring, just a failsafe

Scott Fisher: Thanks for the info, Hitec said to send the servos in so ill make sure to do that and ill probably get a different throttle servo now.
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Old 01-12-2005, 07:25 AM   #6
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would you by chance have been using a JR receiver?? I had a lot of problems with hitec servos when I had a JR receiver. I sent 2 back for service when I was using JR radio. I switched to Airtronics and they work perfectly now.
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Old 01-12-2005, 11:02 AM   #7
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When I started using my new JR radio with receiver i killed 2 JR servos on the throttle within a couple of run days. Even though everything was set right. The 525mg servo is perfect for steering and I never had problems with it.
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Old 01-12-2005, 12:11 PM   #8
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Im running a Ko propo EX-10 Helios
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Old 01-12-2005, 07:16 PM   #9
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maybe its because you keep runing into things
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Old 01-12-2005, 07:31 PM   #10
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Quote:
Originally posted by tunerjetta29
BG: It wasnt battery voltage as i stated the steering servo and other servo i plugged in both operated normally, and i was not using ABS

trashcar: During that session i wasnt using a return spring, just a failsafe

Scott Fisher: Thanks for the info, Hitec said to send the servos in so ill make sure to do that and ill probably get a different throttle servo now.
I would absolutely get a different throttle servo....make sure it has FUTABA on the label.......(SAYS FASTHARRY...owner of 25 hitec servos....and they will be the last I own...If I hadf to send in every hitec servo every time it failed,half my cars would be on the shelf).....
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