correct me if im wrong!?!

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GoffeeRedCat

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Well I decided to take apart my stock throttle servo on my XT!! I was kinda shocked on what I saw!! It had steel gears!! I thought the stock Servos were plastic gears? and that was the main reason why we change them.
 
cat servos

Now you see why i am always asking people to ship there unwanted servos to me- and i would gladly refund there postage. I ran an XB for 1 year on the stockers- just lost the control wire connection on the p-c board- resoldered, cleaned the gears-re-greased- works perfectly. yea, 1st gear on the 5755s are not metal- lame. I run a direct servo harness on cars- this helps. I installed a 645 on the cat- i cannot see one nickels diff in speed or power compaired to the cat throttle servo. I do have 2 new hs 5755 mg-s - they should be an improvement for the steering--
 
Yes the factory uses a low melting point solder and that causes the problems. If you resolder them with 63/37 solder, the servo will last a long time.
 
The green people now require lots of electronic stuff to be rohs compliant. this means that the solder is lead free- its very rough on componets=parts because it flows @ quite a bit higher temp- I never use the run of the mill lead free solder. I use the good stuff- Cardas solder- gold-silver not recycled julers junk either- This makes for a huge improvement to the quality of resolution -detail on hand built stereo componets- a real pleasure to flow this stuff! - just saying--
 
yes, i agree about the lo-melting point solder- if its not quite up to standard- and the heat on the wave bath is too low--- cold joints.
 
GoffeeRedCat said:
Well I decided to take apart my stock throttle servo on my XT!! I was kinda shocked on what I saw!! It had steel gears!! I thought the stock Servos were plastic gears? and that was the main reason why we change them.
Click to expand...
The main reason we change them is because they lock up at full throttle. It's not fun watching your $700+ investment plow into a tree, or worse, another person.
 
Last edited by a moderator:
Thats a very good reason to replace! I had no idea. Unshure if this is a factor on the T servo on my cat- From day one- i set the end point adjustment- re-did the links- carb and brake- dampened with lite springs-both ends of travel on the throttel side- I do reset the brake spring so on the slickest surface on any given day- the brakes do not lock up-
 
well it really sux that a took it apart cuz i cant put it back together since i only need to re-solder 63/37!!!!! i can solder that in a heart beat!! but the gears are all over the place!! lol but does any body know if jrsport st47 any good?? cuz thats what i put on for the moment!!
 
gear set

just clear your thoughts- kick back and do it by trial and error. they will only go together 1 way- assembled in correct order. do not force anything. if you have problems- let me know- i will post a close up photo of an assembled set o gears.
 
GoffeeRedCat said:
well it really sux that a took it apart cuz i cant put it back together since i only need to re-solder 63/37!!!!! i can solder that in a heart beat!! but the gears are all over the place!! lol but does any body know if jrsport st47 any good?? cuz thats what i put on for the moment!!
Click to expand...
Specs...

JR Sport ST47

Servo Voltage: 4.8 - 6.0V Servo Type: Analog Application: .40- to .90-size Aircraft Bushing Or Bearing: Bushing Gear Type: Plastic Height: 1.32 in (33.5mm) Length: 1.52 in (38.6mm) Size Category: Standard Speed: .24 sec/60° @ 4.8V; .19 sec/60° @ 6V Speed (at 4.8V): .20 + sec Torque: 47 oz-in (3.38 kg-cm) @ 4.8V Torque (at 4.8V): 40 - 99 oz-in Weight: 1.55 oz (44g) Width: 0.73 in (18.5mm)



Plastic gears, bummer.
 
GoffeeRedCat said:
well it really sux that a took it apart cuz i cant put it back together since i only need to re-solder 63/37!!!!! i can solder that in a heart beat!! but the gears are all over the place!! lol but does any body know if jrsport st47 any good?? cuz thats what i put on for the moment!!
Click to expand...
The ST47 has plastic gears. Might be a good throttle servo for a nitro, but not a 5th scale.
 
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