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Align T-REX 600N 700N > One-Way Bearing Issue Count
 
 
RobRoy
Key Veteran
Location: Huntsville, Alabama

Usually ATF, but was at the field and all I had with me was the little grease packed that came with the rex.

Ignorance is curable, stupidity is for life.
08-01-2007 11:24 PM
 
 
Wa11banger
Elite Veteran
Location: Huntsville, Al

#18 Locked up twice somewhere in the early 10 or so flights.. Unlocked by brute force both times.. First time it was removed from the airframe and inspected second time it was unlocked as it sat in the airframe. Have not had a problems since and there are so many flights on this bird I doubt she will do it again.
No cleaning, no ATF, nothing but unlocked and reflown

Rick

Proud member of the Quick UK, Duralite Flight Systems, V-Blade, and K&B Dream Designs Teams
08-02-2007 12:49 AM
HOMEPAGE  
 
 
Rockohaulic
Elite Veteran
Location: Valencia, CA, USA, 3rd Rock from the Sun

There are currently 137 Trex Nitros in the Counts post.

So far we have 18 failed one-way bearings, for a failure rate of 18/137 = 13%!

...so far

That is an excessive failure rate. For 1000 units, 130 would be defective.

For comparisons sake, a 6 sigma company would expect 3 failures for 1,000,000 units. I know that's a stretch, but it is a comparison nonetheless.

Team RJX of USA
I got a helicopter for my girlfriend,
It was a good trade!
08-02-2007 01:57 AM
 
 
Wa11banger
Elite Veteran
Location: Huntsville, Al

is it failed or is it not dear rocko.. Mine is not failed it had two faults.. Nothing more than having to reboot your system after a good gaming session I for one do not consider mine failed.. as it was not replaced nor cleaned, nor anything, just unwedged and flown again..

A few others here were reinstalled as well.. A failure is my book is beyond fixing, oiling, lubing, etc.

Just my .02
Rick

Proud member of the Quick UK, Duralite Flight Systems, V-Blade, and K&B Dream Designs Teams
08-02-2007 02:20 AM
HOMEPAGE  
 
 
JeffM1999
Senior Heliman
Location: Thornton, CO

One-Way

Mine locked after 4 flights. Now it is locked after every flight. 600N basic, OS50 hyper, MP5. I am currently pursuing one-way upgrade options. The one-way determines whether or not I can fly my machine. It should have been engineered a little beefier in my opinion.

Guess i am #19.

________________
Magnum Fuels
08-02-2007 02:44 AM
 
 
abgraham
Heliman
Location: Deep South Texas

#20

Mine locked after 11 flights. It now locks most flights. After the first lock-up I cleaned it and used lithium grease. Didn't make any difference for me.
08-02-2007 02:12 PM
 
 
JuanRodriguez
Elite Veteran
Location: Rochester, New York

Quote 
After the first lock-up I cleaned it and used lithium grease

The general consensus regardless of heli brand is that the use of ANY type of grease is a no no......

That being said, there have been documented failures by folks cleaning them out and using a light coating of oil instead.....

Who knows what the answer is other than a defective batch of clutches....
08-02-2007 03:07 PM
 
 
LUCKYSTARZZZ
Senior Heliman
Location: tacoma wa

... 12th flight lock up tried some differant lubes didnt work was locking every flight thats with the stock 4-4-4-4 spacing one way.

installed electric one with equal spacing on the rollers it lasted bout 30 flights now its locking up.
relubed with triflow and will see if it works

so thats 2 so far for me

the ground always wins! ..my heli can beat up your heli
08-02-2007 04:15 PM
 
 
abgraham
Heliman
Location: Deep South Texas

Quote 
The general consensus regardless of heli brand is that the use of ANY type of grease is a no no......

Yea, I've read that too; but, the white lithium seems to be working for some of the guys here?
08-02-2007 04:17 PM
 
 
Rockohaulic
Elite Veteran
Location: Valencia, CA, USA, 3rd Rock from the Sun

Quote 
is it failed or is it not dear rocko.. Mine is not failed it had two faults.. Nothing more than having to reboot your system after a good gaming session I for one do not consider mine failed.. as it was not replaced nor cleaned, nor anything, just unwedged and flown again..

Good point.

Or you can consider whether or not it is a soft failure or a hard fail.

But then again, we all hate it when we have to reboot our computers, and would you be happy with a car that you had to pull over every once in a while to restart?

Team RJX of USA
I got a helicopter for my girlfriend,
It was a good trade!
08-02-2007 05:48 PM
 
 
ldp787
Heliman
Location: South,ILL

#21 and #22

Brand new heli lubed with ATF and failed less within 5 flights.

2nd one way lubed with white lithium lasted about 5-6 flights, locked up for 1 flight, freed itself then immediatley locked again and has remained that way.

I will fly with this POS oneway locked until there is a resolution.
08-02-2007 06:40 PM
 
 
jaxrotor
Veteran
Location: Jacksonville FL

Rock... I have 3 machines with 0 soft or hard failures on the oneway. 0/3= 00.00% .. You have flown one of them and saw 3 or 4 flights on it.
08-02-2007 06:53 PM
HOMEPAGE  
 
 
Rockohaulic
Elite Veteran
Location: Valencia, CA, USA, 3rd Rock from the Sun

jaxrotor,

Well, so far we are at approx 17% failure. So you are in the majority 83%.

Hope it stays that way.

I cleaned out all the red grease with alcohol and lubed mine up very good with ATF last night. Hope that works.

Team RJX of USA
I got a helicopter for my girlfriend,
It was a good trade!
08-02-2007 07:07 PM
 
 
electriciancarl
Veteran
Location: Mesa, Az.

I wonder why the nitro has this problem and the electric doesn't. We E-guys run up to three times the horse power and have no issues with the same parts.
Also, I do not lube mine. My NIP spare is nicely pre-greased as all of mine have been. Aren't yours?
An E version locking up would be very bad. Brrr. The thought of trying to auto with my motor engaged. Scarry.

My surprise at how many people are for sale is only rivaled by my shock at how little they cost
08-02-2007 07:15 PM
 
 
JuanRodriguez
Elite Veteran
Location: Rochester, New York

Just a thought...

Can someone that has NOT had a problem mike his mainshaft ?? (edit: make that the sleeve)

Same thing with the folks that HAVE had a problem.....

Same thing with someone with the E version....

Would be interesting to see if there is a big difference in the dimensions....
08-02-2007 08:18 PM
 
 
DS 8717
rrProfessor
Location: Here wishing i was somewhere else

There is a new sleeve #H60139 that replaces the 60018 sleeve.


http://www.grandrc.com/inc/sdetail/80592
08-02-2007 08:23 PM
 
 
jaxrotor
Veteran
Location: Jacksonville FL

Quote 
Can someone that has NOT had a problem mike his mainshaft ??


What does the main shaft have to do with the oneway?
08-02-2007 08:34 PM
HOMEPAGE  
 
 
Wa11banger
Elite Veteran
Location: Huntsville, Al

Rocko, 17% of people who reported they owned a Trex on the forum.. I had not posted mine in there I am sure there are more than a little over 100 Trex600N's flying in the world.

Agreed about the car analogy but the cool part is my heli hasnt needed a reboot since the initial soft failure. There fore it was a hiccup more like extra water in the gasoline of that car.

Rick

Proud member of the Quick UK, Duralite Flight Systems, V-Blade, and K&B Dream Designs Teams
08-02-2007 08:34 PM
HOMEPAGE  
 
 
JuanRodriguez
Elite Veteran
Location: Rochester, New York

Quote 
What does the main shaft have to do with the oneway?

Should have said "measure the sleeves"

Sprague bearings are designed to operate within certain dimensional tolerances..... perhaps there is a bad "batch" of sleeves that fall short of the required tolerances......

The dimensions I requested may shed some light....

Or perhaps there is simply a bad "batch" of one ways....
08-02-2007 08:58 PM
 
 
ringram2077
Senior Heliman
Location: Birmingham, AL

Quote 
Sprague bearings are designed to operate within certain dimensional tolerances
You might be on to something there. If the sleeve was a little on the small diameter side seems it might let the needles run up too far and distort the cage.
08-02-2007 09:08 PM
HOMEPAGE  
 
 
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Align T-REX 600N 700N > One-Way Bearing Issue Count
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