Hi Guys,Ok i was flying it the other night and it started making weird sounds like gear skipping or something.I took a closer look and the motor pinion was not making contact with the main gear.At home i noticed the motor mounting screws were loose.I then retighten them with the piece of paper between the main gear and the pinion gear.I just ran it on my bench and it was shaking all over.Does anyone have any idea what has happened?This bird has never crashed and i have about 30 or so batterys through it.Is it posible for the main gear to wear down in such a short time?Any and all help please as i am still new to helis. Thanks

The main gear may not be perfectly round so you can't just pick an arbitrary point to set the mesh. Turn the gear and check the mesh at several points to make sure there's a little bit of play in it all the way around. If the pinion is in to close, it my bind up at one point on the main gear causing it to shake.

gnd2, Thanks i'll give it a try.

Hollywood,
What do the teeth on the brass pinion look like? I've worn mine down on one pinion to where there were almost no teeth
left on the pinion. Wouldn't think a poly main gear would wear out brass, but it will. I've had the grub screw that tightens
against the motor shaft work loose and cause some strange behaviors.
If the heli is still shaking all over, check out the feathering shaft. Just a small rotor strike can bend them and everything
goes out of balance resulting in the shakes.
Good Luck,
Don

ya me to i just went through a brass motor gear no teeth left . my headspeed is at just over 2300 and my hbk runs smooth well not after the motor gear ran out of teeth. does anyone know of a better motor pin that is harden steel with a 2.3mm bore hole in it ? i think that might help.

Well thats funny you talk about the pinion because it looks strange in that the center where the main gear meshes it is thiner than the ends.The pinions wears out like that this fast?Like i said i have about 30 or so batterys through this bird.

that is exactly what mine looks like it wore out where the gear meshes with it but the upper and lower part of my 10 tooth pin is still like new and well i noticed the stock main gear has a very bad wobble to it i would bet that your's and most have the wobble to it to so i would assume that this would grind down that motor pin down a little faster . i ordered the MicroHeli CNC Main Gear it is suposed to be very well made better than stock gear and to be wobble free hope this help's the motor gear grind down to a min.

remember that there's a lot of vibration in the heli, use loctite on the motor mount screws (blue) and also on the grub screw (if you have one). Make sure you don't get any into the motor, use the glue stick type and wipe off the excess.

Hey Druss when you say glue stick type what do you mean? Does loctite make a solid form of thread lock? All that I have ever seen is in a tube and it is a liquid. Also, I have seen some furniture that has to be assembled when you purchase it and all of the hardware has type of thread lock on it that is blue and competely dry. Have you ever seen this type of thread lock? You can put the screw in an take it out and the thread lock stays on there. Kind of reusable thread lock. I sure would like to know what that is. If anybody knows on the forums let us know. Coat the screw one time let it dry and your done from now on. Cool. Thanks Gittle

Not sure about the type used on furniture but I do have the gluestick type blue threadlock. It pretty much has the consistancy of glue as well. I like to use it in those areas like around bearings or other moving parts to ensure I don't get any into those parts. Your hobby store should have it. I went from the liquid type, to the cream, and now the stick. I like the cream type the best but the stick comes in handy. Don't use the liquid anymore.

Thats cool. I like that. Is the brand Locktite or something else. Thanks Again. Gittle

Well i'm starting to think that the problem is the main gear.As i look closely i can see where it is not round.The teeth are deeper in some areas and low in others.I guess it doesn't spin perfectly centered.Has anyone had a problem like this?Thanks

I had a problem like that after the stock motor shaft bushing started to wear out, causing the motor shaft to spin in an elliptical instead of circular rotation. It wore the main gear down in some spots. Look at your motor. It may be wearing out a bushing or a bearing on one end of the shaft...

That's what I tried to tell you in my first reply, it's usually not going to be perfectly round. That's why you have to check the mesh all the way around the main gear to make sure it doesn't bind anywhere. Set it so that you have just a little lash at the point where the main gear is closest to the pinion. The rest of the gear will have a little more play in it but it should be OK. Of course if any parts are worn too much you should replace them.

[link=http://www.amazon.com/Loctite-Blue-Threadlocker-Stick-gram/dp/B0002JMLPQ]Here[/link] is a link to the one I use. I'm sure you can find it at most hobby or automotive stores.

as to the pinion issue, i've not personally had any issues with uneven wear on my pinion or gear except for with an align tapered pinion. I switched to a straight pinion to get rid of the problem.

Druss thats funny you say that about the align pinion because i believe that is what is on my motor.It is wider on the top and bottom.I will post a pic tomorrow so you can check it out for me.

Ya, the taper of the align pinions is weird. I don't understand why they do that and have had trouble with it too. Now whenever I put the pinion on the motor I line it up so that the narrow end of the pinion is lined up with the edge of the main gear so that the tapered part is as far from the main gear as possible but the entire width of the main gear is engaged with the pinion. This arrangement seems to work fine for me.

Ok i took a couple of pics showing the pinion to see if anyone can recognize this pinion style.How do i get the pics to this post?I tried click and drag and copy and paste nothing worked.Please advise.

Don't use the fast reply box at the bottom. Either click on the "post reply" right under the last post or click the "reply" button to a particular person. then you'll go into a new window where you can attach pictures.

you might look at this steel pinion gear. It appears to have somewhat of a shoulder but if you shim your motor it should be ok
http://www.readyheli.com/9T_RevCo_Ha..._p/ho-0009.htm