Big Rock Big rock Servo issue

[Jsvt289]

What’s up guys, I put in an upgraded steering servo and have almost no steering even on pavement. When I lift it in the air steering is fine. Any thoughts of what could be causing it? Appreciate you guys as always
I put in this one
https://www.amainhobbies.com/ecopow...high-speed-metal-gear-servo-ecp-120s/p1378076

 

[332_RC]

In a 3s Big Rock? Is the servo saver stock?

 

[Jsvt289]

Big rock but with a 150a esc so sending 7.4 to it.. servo saver is kimbrough

 

[332_RC]

Big rock but with a 150a esc so sending 7.4 to it.. servo saver is kimbrough

Saver might not be strong enough, 25kg servo might be collapsing the inner spring on the pavement when you turn it, not moving the wheels.

 

[Jsvt289]

Interesting you think so? I gunna tare thru it after the kids get to sleep. This is the saver I got
https://www.amainhobbies.com/kimbro...ver-universal-spline-connector-1-kim124/p4584

 

[332_RC]

Looks like a strong enough servo saver tho.

 

[Jsvt289]

 

[332_RC]

When I upgraded my servo to a stronger servo in my Noto the saver did the same thing. It was the stock plastic one & couldn't hold the power. I changed to a aluminum servo saver & it fixed it. Now, granted that's 6s vs 3s & totally different. But I have a 3s Senton the steering is wobbly like that. So many steering pivot points that can have play in a 3s chassis. You got a good servo & saver. Just play in the plastic steering bellcrank. The strong servo found it.

 

[Just a hobby]

Those smc lipos are heavy compared to a 5200mAh. Between that and grip of pavement and tires is the problem. Remember it's built for off road in the dirt.

 

[Jsvt289]

Appreciate the tips.. went thru everything on the bellcrank and there is the normal plastic play (little bit) but all screws are tight enough.. I tried the stock saver and same thing so going to pick up a metal one and try that if that don't work then metal bellcrank. The stock servo didn't have any trouble running that battery size just slow but fully turned.. The truck is 6s capable but I run mostly 4s so i know the truck is heavier then stock but 25kg servo should be able to turn the tires atleast ya know lol

 

[Just a hobby]

Appreciate the tips.. went thru everything on the bellcrank and there is the normal plastic play (little bit) but all screws are tight enough.. I tried the stock saver and same thing so going to pick up a metal one and try that if that don't work then metal bellcrank. The stock servo didn't have any trouble running that battery size just slow but fully turned.. The truck is 6s capable but I run mostly 4s so i know the truck is heavier then stock but 25kg servo should be able to turn the tires atleast ya know lol

What brand servo?

Appreciate the tips.. went thru everything on the bellcrank and there is the normal plastic play (little bit) but all screws are tight enough.. I tried the stock saver and same thing so going to pick up a metal one and try that if that don't work then metal bellcrank. The stock servo didn't have any trouble running that battery size just slow but fully turned.. The truck is 6s capable but I run mostly 4s so i know the truck is heavier then stock but 25kg servo should be able to turn the tires atleast ya know lol

That servo might be weaker than stock. $15 won't buy a strong enough servo unfortunately.

35kg would be better. They are not the best in strength from Amazon. 25kg and 35kg you can drive and steer.

 

[Jsvt289]

What brand servo?


That servo might be weaker than stock. $15 won't buy a strong enough servo unfortunately.

35kg would be better. They are not the best in strength from Amazon. 25kg and 35kg you can drive and steer.

Eco power from Amain

https://www.amainhobbies.com/ecopow...high-speed-metal-gear-servo-ecp-120s/p1378076

 

[Jsvt289]

I found a matching metal servo saver arm it worked beautifully for 1 minute then started making noises, overheating and now dead.. Time for an upgrade! love a good reason to go to the hobby shop

 

[Rowdyray]

I've been replacing all of our 3S servos with the 6S S652's. Affordable and direct fit.

https://jennysrc.com/collections/ar...um-s652-digital-steering-waterproof-ara8608v5

 

[Jsvt289]

Need something with more torque since I bash mostly in the grass in my backyard but appreciate the suggestion

 

[Just a hobby]

I've been replacing all of our 3S servos with the 6S S652's. Affordable and direct fit.

https://jennysrc.com/collections/ar...um-s652-digital-steering-waterproof-ara8608v5

When I had to use the warranty on my kids granite servo Amain Hobby was out of stock. So the self me the s652 works great in the now a bigrock. Great cheap replacement for a 3s senton.

A metal bellcrank will help to, lots of flex in the stock

 

[Jsvt289]

Safe to say is junk now lol

 

[332_RC]

Safe to say is junk now lol

Ouch. I think so too.

 

[Just a hobby]

That sucks! Just a little tip with steering end point. I noticed with both 3s trucks we had if you (now just one 3s truck). Full adjustment was too much for the steering linkage. Causing the stock servo to burn out in 3 runs. So back off on full end point adjustment. Maybe this was corrected.
Check your truck see if full steering end point adjustment on the remote is too much for your steering rack and linkage.
Try that 6s stock servo is in stock your best bang for the buck.

After watching a video years ago on a utuber testing many different servos. And every one was over rated in tourqe numbers. That 25kg is actually like 19kg. Some servos were closer to what was printed and some ate worse on the servo case and in description.

 

[Jsvt289]

Yes end points were set and backed off but appreciate your knowledge and advice!!