savage xl 5.9 reverse throttle and brake

[steb]

hi fairly new to rc world . bought a savage 5.9 new in the box . got in the back garden to break it in .. noticed servo smoking . so obviously turned off the car . replaced the servo for a an old hobao one i have . now the brake and the throttle and opposites . i have tried the swich on transmiter which has no effect .. say if you fail safe it its doing the opposite and opening throttle not put the brake on.. what have i done ?? cheers ste 🙂

 

[ohsnap]

Your transmitters (controller) manual will show you how to "reverse" and correct this situation via its menu.
Somewhere in the throttle controls selection menu of the controller, you'll see something akin to the ability to select norm or reverse.
Just select the opposite of the current setting.

 

[steb]

i have tried that . when i flick the switch / it just locks brakes on / flick it other way it releases then as i say there now reversed / should of added now the throttle trim is also adjusting the brakes 🙁

 

[ohsnap]

Not being in the same room with the Savage and you is less than ideal for this situation as I'm left imagining what has/is transpiring.
So, you are flipping a switch that controls the servos Norm or Reverse setting, and it locks the brakes when you do that?
Like automatically?
I'm kinda stumped.

I think that I would do one of two things.
1. Go to square one and...
A.. Pop the servo horn off the servo
B. Reset the throttle trim to neutral.
C. Set the norm/reverse switch so it moves the servo gear in the correct direction.
D. Remount the servo horn.
E. Go about making any necessary adjustments or tweaks (example - ensure the carb is closed (to idle) when your finger is off the trigger).
- or -
2. Go back to your original settings and buy a replacement HPI servo from somewhere.
For around $25.00 USD, you can buy something like a SS-20WR water resistant throttle / brake servo that should do the job.

I would try #1 first... It may be something as simple as the servos current "resting place" (neutral spot) hits the brakes.
Popping the servo horn and resetting everything should help.

One last thought - I would also make sure I had the servo correctly installed.
I recently threw a T/B servo into a truggy that I had purchased as a servo-less roller (no manual too) and had inadvertently installed the servo with the gear out of position and could not even hook up the horn.

 

[Horatio]

hi fairly new to rc world . bought a savage 5.9 new in the box . got in the back garden to break it in .. noticed servo smoking . so obviously turned off the car . replaced the servo for a an old hobao one i have . now the brake and the throttle and opposites . i have tried the swich on transmiter which has no effect .. say if you fail safe it its doing the opposite and opening throttle not put the brake on.. what have i done ?? cheers ste 🙂

You seemingly need to reverse the channel to get your servo to do what it needs to do.

But.

Check to make sure you haven't changed the orientation of this little L shaped linkage/lever:


If you inadvertently rotate this 90° and switch the throttle linkage into where the servo linkage clevis is supposed to go, and the servo clevis into where the throttle linkage is supposed to go - you'll end up with the throttle opening as the brakes are applied. Seemingly with the servo operating at odds with what you need it to do. 😝

I'm not going to assume anything. So check this mechanism first before you rush to use your radio to reverse anything.

If your linkage and mechanisms are right, also check you have your servo plugged in the right way round. Most servos (not all depending on combination of brand, plug type and receiver) just don't work unless they are plugged in the correct way.

Plugging a servo in backward into the receiver (swapping signal and ground) usually just results in the servo not working but causes no damage. However, reversing the power (positive and negative) to a servo, by swapping those two wires, will likely cause damage and burn out the servo and potentially the receiver.

The fact that your previous throttle servo burnt out makes me think that it may have been constantly cranking the brakes.

Let us know what you find......👍

 

[ohsnap]

Yeah, what he said.
I was just coming back in to mention the brake set-up, but Horatio said it so much better - and with pictures! 😆