Futaba (S9157) Servo overheating

[SaxtonSlaughter]

I'm just wondering if anyone else is having overheating problems with there Futaba S9157 steering servo. I have seen the temps run up to 158 degrees in just 15mins of run time. This has happend to, 2 rigs that I know of.
The rig is a Berg and is running the following electronics!!! Motors/Holmes 45T Hand Wound , ESC/Tekin FXR , RX/Spektrum , Punk Rc Dig , Castle Creation/BEC 6.0v , Battery/Hypierion 1350mah 11.1V/35C Any input will help! THX!!!

[EGRESSor]

Originally Posted by saxtonslaughter

castle creation/bec

6.0v?

[SaxtonSlaughter]

Yep!

[mfawv]

im running the futaba s9157 and no mater what batery i run it gets hot. my bec is at 6v and wired to the instructions, should i maybe run bec directly to cervo?

i am one of the resons for this thread.

[mann0mann]

Ummm....what happened between tuesday night and tonight? I asked you guys both about this tuesday when I was talking about mine! :-P

I believe it's just your end points are off. I really like this servo and I've been running a couple of them on my ax10s for months, with no issues.

I believe your end points need to be set lower than you think or are currently running. I' haven't had a chance to test since making the change but we'll see tomorrow night..

[SaxtonSlaughter]

mfawv and I went to the falls tonight and his servo was running very hot. I believe his end points are set right, but its still running hot.

[mfawv]

if my endpionts get any lower i cant turn. i went to the falls today and under all conditions it got hot, i ran three bats. thru and got hot every time. at one piont 140+. hotter than any other servo ive ran by a consideral amount, hitec 5955, and hobbieco.

mike it hadnt gotten this hot when we talked the other night.

i ran it tonight at my house and it got hot again.

[SaxtonSlaughter]

Mike, what do you have your end points set at on the AX10's?

[Szczerba]

I have one on my super and it's great. I just know not to run for more than 20 minutes or so at a time.

That's really no help but it's my fix.

[gunnar]

My Futaba's run hot too. I think wheel weight might play a small part in the heating, as the Hobbico in the SSS rig with lighter wheels seems to stay cooler, when run for about the same time.

[mann0mann]

My end point setting won't apply in someone else's truck. Linkage, servo arm, radio system will all affect those settings.

I set endpoints first by visually looking for binding. On my truck I set it first by just backing off from getting into the springs or whatever mechanical limit there may be. Then I usually "listen" to the servo. You can hear a digital servo trying to work. I back it off more if it sounds like it's working the servo still.

[mann0mann]

Originally Posted by gunnar

My Futaba's run hot too. I think wheel weight might play a small part in the heating, as the Hobbico in the SSS rig with lighter wheels seems to stay cooler, when run for about the same time.

I don't disagree with what your saying scott, but what sort of muddies this up is. I've got two of these on AX10's with significantly heavier wheels and have never noticed any heat issues.

This most recent servo I'm using on the berg though is noticeably warmer.

Now I'll fall on my sword and admit, the first time I noticed the heat I did have some binding in my steering (totally my fault...the locktight got away from me ). The second time I noticed it I had been bound a bunch and admittedly it was working hard, and I feel like there may have still been some binding from the flex in my steering rod.

I've since then, taking about another 10% more of steering out. I am not anywhere close to any mechanical limitation, so I'm going to give this one more shot tonight. I'm hoping it will solve the issue. May even go run today for a bit to test.

[Code454]

also make sure there is no binding that will be a big thing as well as epa

[Brandon]

Originally Posted by mann0mann

My end point setting won't apply in someone else's truck. Linkage, servo arm, radio system will all affect those settings.

I set endpoints first by visually looking for binding. On my truck I set it first by just backing off from getting into the springs or whatever mechanical limit there may be. Then I usually "listen" to the servo. You can hear a digital servo trying to work. I back it off more if it sounds like it's working the servo still.

Perfect way to set endpoints

My Futaba S9157 harldy warms up and I am running it above the recommended Voltage. I would say enpoints are key here.

[SaxtonSlaughter]

Thanks 4 all the help fellas. Ill have to check out ur rig tonight Mike.