65BAJA
Quarry Creeper
Anyone know what size O ring to use on the output shaft of a Hitec servo between the servo horn and the body to waterproof it? What is the OD of a Hitec servo spline?
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Servo output shaft o ring.
- Thread starter 65BAJA
- Start date
meatmonkey
I wanna be Dave
I've tried this, even brought my 7954 and the servo horn to the hardware store and did not find a suitable o-ring. All were to loose, or to tight once the horn was installed.
Most good horns are clamping type, so they have slots in them that will allow water past your o-ring. And water will also enter in between the case halves, even though they are already o-ringed. It will also enter past the grommet where the three signal wires enter the lower case. Basically water will find it's way inside any chance it gets.
If you want it truly water-proof you'll have to take it apart and literally fill it with dielectric grease. It's what I ended up doing. Works flawlessly, just a little messy and time consuming to do. It's not all that difficult to do, kinda nerve wracking the first time you take an expensive servo apart, but once you do a couple it becomes second nature.
Keep track of where the gears go and do not force the case sections back together. If they don't easily fall into place then check to make sure the pins and gears are properly aligned with their bushings in the case sections.
Remember, if it's full of grease, water cannot get in.
Most good horns are clamping type, so they have slots in them that will allow water past your o-ring. And water will also enter in between the case halves, even though they are already o-ringed. It will also enter past the grommet where the three signal wires enter the lower case. Basically water will find it's way inside any chance it gets.
If you want it truly water-proof you'll have to take it apart and literally fill it with dielectric grease. It's what I ended up doing. Works flawlessly, just a little messy and time consuming to do. It's not all that difficult to do, kinda nerve wracking the first time you take an expensive servo apart, but once you do a couple it becomes second nature.
Keep track of where the gears go and do not force the case sections back together. If they don't easily fall into place then check to make sure the pins and gears are properly aligned with their bushings in the case sections.
Remember, if it's full of grease, water cannot get in.
ROLANDROCKSHOP
I wanna be Dave
I always use the orange hpi orings..
orings and die electric grease.."thumbsup"
orings and die electric grease.."thumbsup"
65BAJA
Quarry Creeper
I packed my first servo winch with grease. I think I over did it though. It turns real slow. Kinda like it has a lot of drag even when there is no weight on it.
meatmonkey
I wanna be Dave
Depends on your servo.
My Hitec 645 and 7954 don't mind the thick dielectric grease one bit.
My Savox 1268 ran hot and slow with dielectric on the gear side. Had to switch to thinner Lucas red and tacky on the gear side and now it works fine. Only bummer is that the Lucas will slowly allow the water in. I've had to take the servo apart once in over a year of abuse to clean the contaminated grease out and flush the potentiometer with CRC electonics cleaner to get it to stop twitching. Refilled with grease and I'm still rocking it.
My Hitec 645 and 7954 don't mind the thick dielectric grease one bit.
My Savox 1268 ran hot and slow with dielectric on the gear side. Had to switch to thinner Lucas red and tacky on the gear side and now it works fine. Only bummer is that the Lucas will slowly allow the water in. I've had to take the servo apart once in over a year of abuse to clean the contaminated grease out and flush the potentiometer with CRC electonics cleaner to get it to stop twitching. Refilled with grease and I'm still rocking it.
65BAJA
Quarry Creeper
Maybe I'll give it a try then. I'm using the 645 too now. It was a 625 I was using that didn't like the thick grease.
You're still running the pot? What controller are you using?
