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HelicopterMain Discussion › friction in TT drivetrain.
10-23-2012 10:23 AM  5 years agoPost 1
Rotormaster

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I am in the process of building my X5, and have noticed that the entire TT drive train has a tremendous amount of friction in its rotation. Turning the tail shaft from the front TT umbrella gear requires some effort, and when the boom is installed on the frame and you try and turn the whole thing... let's just say that it doesn't spin freely.

I have tried removing the TT gears and from the end of the boom, but I cannot seem to do it without damaging the plastic sleeve? Is this glued in place? How do I get it off?

PS: I closed the thread in the Gaui forum because it's dead.

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10-23-2012 11:06 AM  5 years agoPost 2
MartyH

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Can you post a picture? I'm not clear on what you are taking apart. I don't own the X50 but I have about every other model of nitro heli's TT makes.

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10-23-2012 01:16 PM  5 years agoPost 3
Rotormaster

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Sorry. I don't have a Thunder Tiger heli, I have a gaui X5. I managed to get the TT out of the boom from the tail side. It is now apparent that the friction is being caused by every single bearing.

The manual makes no mention of the need to oil the bearings, except for the bearing in the middle of the TT and as well the one-way.

Can I use the Scorpion motor bearing oil?

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10-23-2012 01:28 PM  5 years agoPost 4
sonnyhad

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Sure, its bearing oil. This is a new x5 right?

Bald Pilots usually wear hats!

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10-23-2012 01:45 PM  5 years agoPost 5
Rotormaster

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Just days old mate. I'll go ahead and apply the oil. Cheers.

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10-23-2012 02:36 PM  5 years agoPost 6
Rotormaster

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I have oiled all the bearings and they're still stiff.

I know they will loosen up after a few flights, but this seems abnormally stiff.

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10-23-2012 03:07 PM  5 years agoPost 7
Stephen Born

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It is now apparent that the friction is being caused by every single bearing.
The manual makes no mention of the need to oil the bearings
You should check all the bearings before the build. This is a rudimentary practice.

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10-23-2012 04:18 PM  5 years agoPost 8
Rotormaster

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You should check all the bearings before the build. This is a rudimentary practice.
How do you mean 'check' them? I just see whether they spin freely and are notchy. If they spin freely and are not notchy and they feel fine then I leave it at that.

What, do you pull them apart and individually weigh every ball or something?

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10-23-2012 04:52 PM  5 years agoPost 9
Stephen Born

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I just see whether they spin freely and are notchy.
The bearings in kits should always be checked. Some of the kits sit around for months waiting to be sold. Some kits just have bad bearings. Some bearings are better than others. If the bearings spin freely and are not notchy, then there would be no issue.
If they spin freely and are not notchy and they feel fine then I leave it at that.
^^^Above, you indicate if they feel fine and are not notchy, then you install them.
However, your below quotes suggest different practices.
It is now apparent that the friction is being caused by every single bearing.

I have oiled all the bearings and they're still stiff.

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10-23-2012 05:22 PM  5 years agoPost 10
sonnyhad

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Spin them all a little they should free up.

Bald Pilots usually wear hats!

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10-23-2012 05:41 PM  5 years agoPost 11
Auddiss

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CT

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You need to set the tt gear mesh on a x5 by sliding the boom either in or out till they mesh correctly, the easiest way is to push the boom in all the way then back it out a tiny bit till the gears fell nice. If they are to tight or to loose you will strip in flight, so this is important to get right

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10-24-2012 02:10 AM  5 years agoPost 12
JasonJ

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North Idaho

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How do the bearings install? I ask because on my Velocity they call for holding the bearings in place on the shaft with a drop of CA. The bearings sit in rubber holders. If any of that CA got in the bearings it would be stiff city.

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10-24-2012 10:27 AM  5 years agoPost 13
Rotormaster

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^^^Above, you indicate if they feel fine and are not notchy, then you install them.
However, your below quotes suggest different practices.
I did intend to remove the beatings... that's why I was asking how to remove the plastic sleeve in the OP.

I think you have the impression that I was attempting to ignore the bad bearings because I mentioned installing the boom into the frame. I should tell you that I didn't actually install the boom, per say... I only slid it into the book mounts to check the friction of the drivetrain in it's totality.

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10-24-2012 10:29 AM  5 years agoPost 14
Rotormaster

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By the way, the bearings are still stiff after having applied oil... and no, I did not super glue them.

Any ideas?

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10-24-2012 02:18 PM  5 years agoPost 15
Auddiss

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CT

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From what it sounds like its probably not a bearing problem if your saying you checked them all and are free and smooth. To me it sound like the tt gears are to tight, make sure that the plastic holders on the end of the boom are seated all the way. And I read earlier you didn't know how to take them out, what I do is take a old TT and put it in the boom and push it on the floor to get it out.

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10-24-2012 02:53 PM  5 years agoPost 16
RCHSF

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NC

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Good Bearings can freeze up also, if all else fails. Use your solder iron tip hold it to the bearing for 30 seconds, or so get it warm, not hot enough to melt any surrounding plastic, and re-oil and keep trying to get it to spin free. And I assume you have the TT removed from the heli and tail gear box when doing this. Just to make sure it is the bearing on the TT, and nothing in the heli, or tail gear box. If possible remove the bearings from the TT before doing what I mentioned above.

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10-25-2012 04:15 AM  5 years agoPost 17
Rotormaster

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From what it sounds like its probably not a bearing problem if your saying you checked them all and are free and smooth. To me it sound like the tt gears are to tight, make sure that the plastic holders on the end of the boom are seated all the way. And I read earlier you didn't know how to take them out, what I do is take a old TT and put it in the boom and push it on the floor to get it out.
I did manage to get the front bearing off the boom, and found that the only bearing that is OK is the one inside the rubber holder in the middle of the boom.

The friction is there even when there is just a single umbrella gear on the end of the TT with nothing connected on the other side... like I said, I didn't have the boom installed in the heli, so it's not the gear mesh.

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10-25-2012 04:22 AM  5 years agoPost 18
Rotormaster

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Does this really work? I would like to know before I do anything because I have now got the boom installed and clamped down with the support rods and everything... so I don't want to pull it apart if it's not going to work.

After I oiled them and left them over night they loosened up a little. Still doesn't seem normal.

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10-25-2012 04:28 AM  5 years agoPost 19
sonnyhad

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After all that, give it a run and see if they loosen up. That's if you're sure the mesh isn't too tight. After you run it a bit check again, if you still have a problem the problem will be more evident after its been run. Those bearings will spin pretty fast, so if there is a problem, they'll heat up.

Bald Pilots usually wear hats!

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10-25-2012 10:21 AM  5 years agoPost 20
Rotormaster

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Yeah, will do. If that fails I'll just have to get some replacement bearings I guess.
I still haven't finished the build... I might not even have it ready by this weekend.

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HelicopterMain Discussion › friction in TT drivetrain.
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