hitec 5645MG and 650M

[olds97_lss]

Anyone know if either of these servos use o-rings between the case pieces and output shaft? I'm tired of dealing with water damage on my stupid servos, but I don't need a really high end servo for my needs. I just want one that's sealed with decent torque/speed numbers.

I may resort to getting another hitec 985MG as I know it's sealed, but it's overkill for what I want it for. I need a suitable replacement for my revo T/B servo. Instead of spending $80-$90 I'd rather spend $50 for what I want. But, for reliability I may end up buying the 985MG anyway.

I know I could avoid water, but that won't happen. I'd rather use things that don't require me to change my habits... I'm mildly bullheaded. :llama:

Thanks.

 

[SkyMaxx]

I don't know about the 650, but happen to have a HS-5645MG NIB sitting on my desk. I'll crack it open and let you know.

-SkyMaxx

 

[olds97_lss]

Thanks! I appreciate it. I'm looking primarily to see if the output shaft is sealed like my 985MG is. The case is pretty easy to seal, but my water always gets in around the output shaft.

 

[SkyMaxx]

Can't give you a good answer. Taking it apart, the output shaft has a bearing sitting on top...so no to the gasket between output shaft and servo case. However, the drive gears are separated from the electronics by a second case. The best thing I can determine about the drive shaft from the servo motor into the gearing compartment is that it is "sealed" with grease. There is quite a bit of white grease in the gearbox portion of the servo. Without tearing the servo all the way down, I would say the servo can take a little water exposure but is best not submerged for any length of time. I'd say the biggest intrusion issue will be the break points in the casing (where the bottom plate attaches and the wiring goes into the case and the top plate that closes up the gearing compartment. Throwing some additional grease into the gear box portion would probably be adequate to prevent water intrusion from the point as the drive shaft enters the case at one side of the servo and the next hole in the case is over the motor's shaft at the other end of the servo.

 

[olds97_lss]

I said the heck with it and bought another 985MG. It's fast, it's strong and most importantly, it's sealed.

I have a feeling that I've been fighting the servo going bad for a while. I kind of have been letting the revo sit since I got my aftershock. When I did fire it up, I realized the BB was just too big, so I dropped back down to the 18TM. I couldn't believe how poochy it felt, but this was the first time I ran the 18TM in the 3.3 chassis. I just thought that the chassis being longer killed my wheelies.

I have a feeling half of it was the servo moving very slowly (which I noticed this weekend before it died). That would also explain my total lack of control off of jumps... no brakes, or at least intermittent brakes. The smoke finally got out of the servo this weekend... I couldn't catch it all and get it back in. I have a feeling it was also affecting how I tuned. It seemed so dead on the bottom out of the hole, but it was running kind of warm (around 250F), so I just dealt with it.

We will see hopefully on the 4th. The new servo just flops the linkage around like it isn't even there. Sometimes overkill isn't all bad.

 

[SkyMaxx]

LOL...overkill...no such thing in the RC world...at least, I don't think there is...guess it is all relative.