RCCrawler Forums

Ur2respect · 01-15-2011, 10:29 PM

I have just bought a hitec 7954 servo and its running directly off the power in wires for the esc. My problem is it makes an odd noise just sitting. It seems to zero fine and its got boo koo torque and speed but the "glitching" noise bothers me and the sound is embarrassing. Any ideas of what I could do? I dont have a programmer if it makes any difference.

entropy · 01-16-2011, 03:26 AM

Does it sit and twitch?

Ur2respect · 01-16-2011, 06:00 AM

No not at all, if I lift the truck up it stops. I'm guessing it could be an adjustment but I cant figure out what to do. I do have a 2.4g setup.

pete2thei · 01-16-2011, 07:49 AM

I have the same servo with exact same problem. I have a cc bec and have changed the voltage with no luck

racerrandy · 01-16-2011, 07:52 AM

Thats just the nature of digital servos, if you pick the truck up where the tires are not touching the ground it will quit.

Its nothing to worry about.

Randy

Chi Town · 01-16-2011, 07:54 AM

Is it making a high pitched noise? More than likely it is just your servo trying to find center. Pretty standard...does it on my comp rig and my scaler. Nothing wrong with it. I would recommend a bec...helps a lot with the servo's torque and performance.

meatmonkey · 01-16-2011, 10:42 AM

My HS7954 made enough noise to concern me as well, but apparently it is normal. It is definately the loudest part of my axial. All my non-rc friends think it is broken...

I also run my servo directly off the the ESC power plug for mucho torque and speed.

After a while you can tell how bound up the steering is by how the servo wines.

Ur2respect · 01-16-2011, 06:06 PM

I think I got a faulty servo, it stopped working. All it does now it twitch.

entropy · 01-17-2011, 01:31 AM

Man, I must be going deaf!

Flexx · 01-18-2011, 03:34 PM

Quote:

Originally Posted by Chy Town

Is it making a high pitched noise? More than likely it is just your servo trying to find center. Pretty standard...does it on my comp rig and my scaler. Nothing wrong with it. I would recommend a bec...helps a lot with the servo's torque and performance.

Hitecs make noise. Great servos though!
Contact Hitec if it is still under warranty. Run a Castle Creations or similar BEC (Battery eliminator circuit) which will regulate the power to the servo. Running off the battery power wires could cause power spikes from esc motor draw to fry servo.

offroadace · 11-13-2012, 10:24 AM

PHEW!! I thought I was going NUTS!!! I have the same issue with the Hitec 7954!! Just a high pitch sound but no twitchiness. Did it no matter if connected direct to the ESC or to the external BEC. And I have 4WS and swapped servos and it still did it on the front steering. No problem with the rear steer though (disconnected to verify).

Thanks for this thread!!!

ORA.

KBrog · 11-13-2012, 06:58 PM

What voltage is that servo good for? You may have over powered it running off the ESC power wires (straight from the battery).

A B.E.C. is the only way to go.

Charlie-III · 11-13-2012, 07:05 PM

Quote:

Originally Posted by KBrog

What voltage is that servo good for? You may have over powered it running off the ESC power wires (straight from the battery).

A B.E.C. is the only way to go.

My guess is that when it was stated, "connected direct to the ESC" means using the BEC within the ESC.

stanmondz · 11-14-2012, 03:56 PM

probably wired like a couple of mine. signal and ground to rx and positive to the deans plug on the esc. strait lipo voltage.

KBrog · 11-14-2012, 04:08 PM

Quote:

Originally Posted by Charlie-III

My guess is that when it was stated, "connected direct to the ESC" means using the BEC within the ESC.

I dont read it that way. I read it as written " running directly off the power in wires for the esc". Hoping Ur2respect can fill-in the details.

Edit: Just searched info on the 7954. it says it can run 7.4v. A fully charged 2s lipo will run higher than 7.4v so if wired directly off the power in wires for the esc

01-15-2011, 10:29 PM	#1
Ur2respect Newbie Join Date: Dec 2010 Location: Fredericksburg/Spotsy Posts: 27	Servo issue I have just bought a hitec 7954 servo and its running directly off the power in wires for the esc. My problem is it makes an odd noise just sitting. It seems to zero fine and its got boo koo torque and speed but the "glitching" noise bothers me and the sound is embarrassing. Any ideas of what I could do? I dont have a programmer if it makes any difference.

11-13-2012, 10:24 AM	#11
offroadace Rock Crawler Join Date: Oct 2012 Location: Garden Grove Posts: 546	Re: Servo issue PHEW!! I thought I was going NUTS!!! I have the same issue with the Hitec 7954!! Just a high pitch sound but no twitchiness. Did it no matter if connected direct to the ESC or to the external BEC. And I have 4WS and swapped servos and it still did it on the front steering. No problem with the rear steer though (disconnected to verify). Thanks for this thread!!! ORA.

11-13-2012, 06:58 PM	#12
KBrog RCC Addict Join Date: Aug 2009 Location: Earth? Posts: 1,698	Re: Servo issue What voltage is that servo good for? You may have over powered it running off the ESC power wires (straight from the battery). A B.E.C. is the only way to go.

11-14-2012, 03:56 PM	#14
stanmondz Rock Crawler Join Date: Mar 2011 Location: hampton Posts: 984	Re: Servo issue probably wired like a couple of mine. signal and ground to rx and positive to the deans plug on the esc. strait lipo voltage.

01-16-2011, 03:26 AM	#2
entropy Quarry Creeper Join Date: May 2009 Location: Under Communist Occupation Posts: 271	Does it sit and twitch?

01-16-2011, 06:00 AM	#3
Ur2respect Newbie Join Date: Dec 2010 Location: Fredericksburg/Spotsy Posts: 27	No not at all, if I lift the truck up it stops. I'm guessing it could be an adjustment but I cant figure out what to do. I do have a 2.4g setup.

01-16-2011, 07:49 AM	#4
pete2thei Newbie Join Date: Oct 2009 Location: Boston & western ma. Posts: 16	I have the same servo with exact same problem. I have a cc bec and have changed the voltage with no luck

01-16-2011, 07:52 AM	#5
racerrandy Quarry Creeper Join Date: Oct 2006 Location: kansas city Posts: 369	Thats just the nature of digital servos, if you pick the truck up where the tires are not touching the ground it will quit. Its nothing to worry about. Randy

01-16-2011, 07:54 AM	#6
Chi Town Pebble Pounder Join Date: Apr 2010 Location: CSRA Posts: 171	Is it making a high pitched noise? More than likely it is just your servo trying to find center. Pretty standard...does it on my comp rig and my scaler. Nothing wrong with it. I would recommend a bec...helps a lot with the servo's torque and performance.

01-16-2011, 10:42 AM	#7
meatmonkey I wanna be Dave Join Date: Aug 2004 Location: central VT Posts: 2,300	My HS7954 made enough noise to concern me as well, but apparently it is normal. It is definately the loudest part of my axial. All my non-rc friends think it is broken... I also run my servo directly off the the ESC power plug for mucho torque and speed. After a while you can tell how bound up the steering is by how the servo wines.

01-16-2011, 06:06 PM	#8
Ur2respect Newbie Join Date: Dec 2010 Location: Fredericksburg/Spotsy Posts: 27	I think I got a faulty servo, it stopped working. All it does now it twitch.

01-17-2011, 01:31 AM	#9
entropy Quarry Creeper Join Date: May 2009 Location: Under Communist Occupation Posts: 271	Man, I must be going deaf!

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