servos.servos.servos........

[jreblast]

Adam,

My brother and i both just bought losi 2.0 rtr buggy. broke them in and took them to are club track. I got one lap in and my throttle and steering servos both went out. went over to the trailer at the track and purchased two hitech 7955 and installed them so i could race the heats leading up to the mains. I got five laps in on 7955 and steering servo cranked hard left and stayed there. could not race cause i was out of money. We have went back three times and still have only made it through one main . between me and my brother we have went through 9 servos in couple of weeks. it dosent matter what we do servo saver,o rings,set are end points, lots of help from club pros, it still keeps blowing servos out. we are ready to sell these buggy we cant afford this every weekend. any advice would be greatly welcomed. we cant take much more. If we can keep these things running they drive awsome...

[TrU Integra]

There's No reason what so ever for the 7955's to be letting go....IF the End points are set properly and there's no mechanical binding of any sort they should outlast every single part on the car.

I hate to say it like this but you are your brother are Doing Something wrong.....Not Intentional obviously but something's up For Sure.

What is failing on each servo ? explain the failures please.

[packhntr]

Hate to say it, but welcome to Hitec servos......When I worked at my local hobby shop, Hitec servo's had the highest failure rate compared to every other brand COMBINED. Yes, they're cheap in price, but that price also reflects other undesirable qualities. Yes, they've come a long way in recent years, but they still have a LOOOOOONNNNNNNNNNNGGGGGGG way to go.

[jreblast]

The servos just turn right or left and just stay there. Sometimes you can turn the car back and forth with your hands and you might get 10 min. if your lucky. Is the radio tray the same on rtr as is roller?.... Guys at the track said they went through alot of servos as well, they now drive mugans. If it blows out one more servo i will be to.......thanks for your help..

[jreblast]

What is the best servo to put on losi 2.0?

[jreblast]

Hitech servo was not cheap, it was $109.00

[eurofocus]

Like truintegra said, there has to be an issue with the epa... or perhaps the tray is cracked and the servos are enduring much more abuse than you can see. See if your lhs can give you a hand resetting the servos epa's and double check the radio tray for cracks and tight screws. I find it really hard to believe that you've gone through multiple servos and are still getting faulty units. I can almost guarantee i've ran my Hitecs epa's way off and have yet to kill one. *knock on wood*

[packhntr]

The biggest issue that Hitec servo's always had was defective potentiometers (pots)....these "pots" detect the amount of rotation that the servo is doing at any given moment. If your EXP is way off, you can easily overload them and destroy them.....I am not to familiar with the Spectrum radio, I run a 3PK and can set the left and right throw seperately and seperate of the exp settings. Limit the left and right throw of the servo and see what happens.

As far as servo's....I run Futaba brushless now, but when I raced back in the day, I used KO as Futaba had no race worthy servo then. I used the same servo's for over five years with NO failures and only one instance of a stripped gear (this was on a KO all plastic geared servo).

When Futaba came out with the 3305 it pretty much took the place of teh Hitec 645MG for cost and power and was infanitly more durable. I have never seen a Hitec servo last more than four months before it begins to have centering issues due to the faulty "pots". For $110, you could have gotten a Futaba brushless servo and for a little more, you could have gotten a more powerful one yet and probably not had these issues.

First things first though....check your radio's settings, limit your throw..you DO NOT need to have full throw left and right, and they need not be the same amount each way! Get that problem taken care of first!

[jreblast]

thanks pack,euro,.. i will get to the bottom of it and tell you what i was doing wrong. I have the car apart now.

[TrU Integra]

There's a Reason 2 of the Top driver's IN the World (among MANY) ONLY trust Hitec to their Race rigs.

[jreblast]

losi eight 2.0 and hitech servos is just not going to work for me. I have an odonnel truggy with hitech servos, both throttle and steering and they have not failed me one time in a year. If i race the buggy hard my servos will for sure break. i'm going to try different servos this time and if they break my losi 2.0 is going down the freakin road.

[TrU Integra]

losi eight 2.0 and hitech servos is just not going to work for me. I have an odonnel truggy with hitech servos, both throttle and steering and they have not failed me one time in a year. If i race the buggy hard my servos will for sure break. i'm going to try different servos this time and if they break my losi 2.0 is going down the freakin road.



Hitec's are more then up to the task of steering and throttle duties on the 8ight....If your blowing servo's your doing Something wrong...Too much Epa, Binding somewhere, or the case is sitting on the dirt guard will all cause a servo to fail No matter what brand.

[mblgjr]

Hitec's are more then up to the task of steering and throttle duties on the 8ight....If your blowing servo's your doing Something wrong...Too much Epa, Binding somewhere, or the case is sitting on the dirt guard will all cause a servo to fail No matter what brand.

I've got to call you out on this one...

I've run Hitec servos for 15 years almost exclusively in 1/10 and 1/8 nitro. Setting EPA is not new and I've had 2-servo failures in my racing career. 1- just deserved to die and was ancient. The 2nd was a Futaba 1st gen digital, like a 9450 or something and I had a MASSIVE high speed impact with another car and the geartrain broke on the last lap of a 45min race, immediately after I crossed the finish line...it deserved to be broken though.

I've used Hitec 605BB; 925/945 (everything but digital) and 5925/5945 (the first Hitec digitals)... Then we jump to modern day...with the numbers.


My Losi 2.0 platforms have EATEN throttle servos.

I'm on #3 now, but the worst one was a 7940TG that did EXACTLY what the OP described. It had maybe 45mins of runtime on it. Went to fire for the main, did my radio check, fired the engine and it idled momentarily before being snatched wide-open (beyond the epa limit) to the point it actually pulled the ball cup off the carb's ballstud.

Reversing the channel, it would sweep full in the opposite direction. I swapped receivers and batteries to ensure it was actually a servo problem. It was and has been sent in to Hitec.

Now, I know of another poster on RCTech that posted a thread the same week as my 7940 failure; he had a 7955 in the steering position that did the same thing (full limit one direction).

I've also witnessed multiple other 7940's fail (and other brands) in the throttle position on the Losi 2.0

Another one I lost had 4 hours of runtime and it would "center", but not actuate. If you applied a little torque by hand to "Help" it, it would sweep a couple times then stop (recentered). Hitec warrantied it and the note came back saying the motor was replaced.

Having been a Hitec diehard for 15 years doesn't make me want to leave them because I like their products. However, I truly believe that they have a mfg. issue right now with their components and/or quality control testing.

I also think Losi needs to take a look at the radio tray again and add 2-attaching points; one either side (or end) of the throttle servo and change the sideguard molding a little so it's not as close. I've already trimmed my sideguard away for clearance.

For the most part, *most* racers now know how to set the EPA's within reason these days, almost every radio has the function now.

Is Drake sponsored by Hitec? Sure. Is he having DNF's because of them? I dunno, but unless Hitec is sending him pre-tested/cycled on-spec servos these days, or he's replacing them before the mains....I'd be getting a little nervous about losing one.

[TrU Integra]

In 4+ year's of running losi.....ive had 1 hitec go bad and it was after 4 SOLID year's of abuse...IMO there's nothing wrong with the losi tray.

Ill say it again....Something's up if your going through servo's...as to what, im not sure....but something going on to cause it....Yes there's the odd servo that has issue's but as of the last couple year's hitec has Proven to be the Most reliable Bullet proof servo on the market. When Pro driver's run Hitec with the label's removed Despite who is sponsoring them for their electronics Says Big things.

[8ight 503]

I have used JR 9100S servos and the 9100T servos in the past and have not had a problem with them. The 8ight 1.0 had problem with going through throttle servos but i have not had a problem with servos in the 2.0's. I haven't run Hitec servos before so i cant comment on those.

[4X4=EXTREME]

What grease would i use for the differentials in the Losi Comp crawler????:confused:

[S. Culbert]

Hitec 7955's are awesome servos .... If they keep going there is something done wrong. It would be hard to beleive that probably the most popular servo on the market is junk. I have been running them for a very long time and i no longer keep a spare servo in my box because i will never need it.... One other thing you may want to check is that the servos are not "slamming on the chassis when you bottom out. If they are not spaced properly off the radio tray that could happen. Just a thought... like integra said there has to be something some where thats wrong...

[old skool]

I Had my 7955 and then my 7950 go out on my 8T-2.0 on the throttle side. Turns out the way the servo was pulling the carb was making the carb bind. I shaved some plastic off the center diff mount and rotated the carb so the ball stud was parallel to the chassis and i also rotated the carb itself so the servo pulls the carb with less of an angle and that seems to have solved my servo problems.

[scortchenscott]

I have been using hitek servos for YEARS .The only ones that have broken were the ones that got run into somethin HARD with the servo saver cranked tight....And all I had to do was change the gears ( 5 dollars ) and it was good to go !!!!

[dillon]

if you really get tired of it and wanna get rid of it. look me up. i got a losi desert truck and im tired of it. it stripps transmission gears and melts motors all the time. ive gotten to the point where it just sits. i play with it maybe once a week for five mins. but really look me up when your done with it.

[sbv20j]

might be stating the obvious but are your receiver batterys ok, what type batt packs are you running?