View Full Version : Tail doesnt spin freely as before - bearings?
08-11-2009, 07:44 AM
After a small tip over I needed to replace the boom because of a small dent. Anyways I notice that my tail doesnt spin as freely as before. Before I would put my tail rotor in front of a house fan and it would blow, now it would only turn once or twice in front of the fan.
I checked and lubed all the 5 bearings, it seemed good.
08-11-2009, 10:50 AM
I'm assuming that you're holding the TR assembly (off the boom) in front of the fan. If so I would check to see if there is a constant drag when turning the tail rotor by hand or if the drag comes and goes. Could be a bent TR output shaft. If you've changed out the TR shaft, then the spacer on the TR shaft could be binding (too tight on end play adjustment). Loosen the screws on one side of the TR housing and see if it turns free. If so, lightly sand down the spacer, reassemble and test again.
Don C :)
08-11-2009, 10:59 AM
there is no constant drag, there is a little play in the TR shaft, i have changed the shaft also. mesh is ok. yea its wierd, i mean its flyable i guess but before it just seemed like had a little more spin.
Does yours spin this freely when put in front of a fan?
08-11-2009, 11:10 AM
Yes mine spins freely...
Could be you've damaged some bearings and they are causing the drag.
08-11-2009, 11:20 AM
i will change all my bearings out tonight. all 5, did you put grease in yours? I put grease in mine when there was none before, maybe thats whats causing it?
08-11-2009, 12:00 PM
I do not lubricate any bearings because they come pre-lubricated. When I've greased bearings in the past, they become very draggy and would not turn freely and this could be your problem
To check for damaged bearings, put the TR shaft in one bearing at a time and turn it by hand. You will feel if the bearing is rough and needs to be changed.
08-11-2009, 12:41 PM
wow i didnt know grease causes drag.
08-11-2009, 12:51 PM
Too much and or too thick does....
08-11-2009, 02:23 PM
Ok so I am going to replace the 5 bearings in my torque tube, can I use these? the part number doesnt match but the size and description matches?
08-11-2009, 03:16 PM
Use the bearings shown in the manual. Go here to download the manual (if you do not have one) http://www.curtisyoungblood.com/products_view.php?id=35
Different bearings are used in different parts of the TR drive system.
08-11-2009, 03:38 PM
I can't seem to find those bearings by themselves, what are those bearings used for anyways? I notice that part number ND-YR-A039 isnt even in the manual parts listing. but the descriptions are exactly the same.
can anyone else confirm this?
08-12-2009, 12:18 PM
just changed to all new bearings using the above part numbers, tail now spins very free, I have my old bearings and TT in a bag with the grease. I will use them last.
If you overgrease a bearing, you can just use it for it's implied purpose, and the grease will wear down and get smooth again.