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Thread: Steering problems with the Redcat Racing Sumo Crawler

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Old 04-06-2017, 06:45 PM   #1
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Default Steering problems with the Redcat Racing Sumo Crawler

When I try to steer, both front and rear wheels won't turn. Both servos also makes a high pitch noise as I try to steer on the remote.
I replaced the old servos with new ones but It still doesn't steer.
Switching steering modes doesn't help and the throttle works fine.
Do I just have bad luck with servos or could the ESC be the problem?
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Old 04-07-2017, 03:39 PM   #2
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Default Re: Steering problems with the Redcat Racing Sumo Crawler

Sounds like might be ESC or RX, it is possible to get multiple bad servos, but I'd check the other two options first. Unplug one thing at a time , re-plug it all together and make sure fully seated plugs. Then try, if same problem, unplug one thing at a time and try steering.
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Old 04-07-2017, 04:05 PM   #3
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Default Re: Steering problems with the Redcat Racing Sumo Crawler

Do the servos turn if you unhook the servo horns? It almost sounds like you have something binding although it does seem odd that both are doing this.
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Old 04-07-2017, 06:23 PM   #4
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Default Re: Steering problems with the Redcat Racing Sumo Crawler

are you using the stock batteries or a lipo?
the stock servos have a tendency to bind easily. I take the cover off and use white grease in the gears to help the binding problem, but sooner than later they need to be replaced. I wont use the stock servos due to problems and get metal geared servos when replacing...
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Old 04-08-2017, 01:44 PM   #5
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Default Re: Steering problems with the Redcat Racing Sumo Crawler

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Originally Posted by Natedog View Post
Sounds like might be ESC or RX, it is possible to get multiple bad servos, but I'd check the other two options first. Unplug one thing at a time , re-plug it all together and make sure fully seated plugs. Then try, if same problem, unplug one thing at a time and try steering.
I've tried and there's no change. Still doesn't steer.
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Old 04-08-2017, 01:46 PM   #6
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Default Re: Steering problems with the Redcat Racing Sumo Crawler

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Originally Posted by C*H*U*D View Post
Do the servos turn if you unhook the servo horns? It almost sounds like you have something binding although it does seem odd that both are doing this.
Without the horns it still doesn't turn. But it does sound like it's trying to turn.
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Old 04-08-2017, 01:50 PM   #7
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Default Re: Steering problems with the Redcat Racing Sumo Crawler

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Originally Posted by RJW View Post
are you using the stock batteries or a lipo?
the stock servos have a tendency to bind easily. I take the cover off and use white grease in the gears to help the binding problem, but sooner than later they need to be replaced. I wont use the stock servos due to problems and get metal geared servos when replacing...
I am using stock batteries. I can try using white grease when I get some. Though I don't know where to find metal geared servos for 1/24 scale RCs.
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Old 04-09-2017, 08:35 AM   #8
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Default Re: Steering problems with the Redcat Racing Sumo Crawler

HK 929mg servo is metal geared and cheap......the original servo horn fits and it is a direct fit. If you have access to any other servo regardless of size plug it into the esc and see if it works. You dont need to install it in the sumo. If so the existing servo is bad, if not it is the esc.

Last edited by RJW; 04-09-2017 at 08:42 AM.
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Old 04-09-2017, 12:59 PM   #9
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Default Re: Steering problems with the Redcat Racing Sumo Crawler

if you have throttle but no steering and the new servos dont turn either, you probably have a bad rx....not a bad ESC
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Old 04-09-2017, 02:01 PM   #10
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Default Re: Steering problems with the Redcat Racing Sumo Crawler

The receiver and esc are one unit in the sumo crawler..
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Old 04-09-2017, 02:11 PM   #11
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Default Re: Steering problems with the Redcat Racing Sumo Crawler

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Originally Posted by RJW View Post
The receiver and esc are one unit in the sumo crawler..
I see, I did not know that, sorry...
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