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HomeAircraftHelicopterAlignT-REX 600N › one way bearing advice please
10-15-2010 04:44 AM  8 years agoPost 21
lfalsetto

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COLORADO

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Don't know if this will help but I read that if you tighten the Jesus bolt too tight it distorts the case and causes premature seizing.

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10-16-2010 12:54 AM  8 years agoPost 22
R.J.

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SF bay area, CA USA

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Did you try also replacing the H60139 One-way Bearing Shaft when you replaced the one-way bearings? My hub was locking up even with a new stock one-way. I changed the one-way shaft, and it is better.

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10-16-2010 02:12 AM  8 years agoPost 23
TrevJonez

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St.George, Utah - USA

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im using the same one way shaft its just the bearing that was the problem on mine.

Who cares... its just money...

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02-25-2011 05:10 PM  7 years agoPost 24
BobOD

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New York- USA

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Probable Reason for Lockups
I recently did a little investigating on the Trex 550 and 600 one-way clutches and what I found was interesting. I figure I'd share it with those interested.

For a drawn cup roller clutch bearing, an h6 fit class is recommended by the clutch manufacturer for the shaft diameter. This means the shaft should be:

11.989 to 12.000mm

However, I measured one that I had around a year or 2 and one that I just bought to see. I got the following measurements.

12.027mm
12.032mm

Considerably oversize!
This would explain lockup issues. Based on this, I would predict that any hub that gives you a tight press fit of the bearing would be prone to these lockups (the housing fit defines the installed diameter of the inner race of the clutch).

Three possible solutions:
1. If you happen to find a hub with a fairly loose fit, hang onto it. Use red loctite and you'll probably be good.
2. Use a little sandpaper on a dowel to open the hub bore up a little. 0.030mm isn't that much so should not be too difficult.
3. Press an old clutch through several times. It'll open the hole up a tiny bit each time.

The proper solution would obviously be to grind down the shaft (sleeve actually) to proper spec but unless you have access to some precision grinding equipment, not an easy thing.

And yes, overtightening the cross bolt will cause a problem as well.

Team POP Secret

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02-25-2011 07:10 PM  7 years agoPost 25
Eagle2bravo

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Out flying somewhere

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Humm..interesting stuff. I be checking mine now..seeing how it's new.

T-rex 600n super pro , Trex 450 se, Gaui 200, Trex 500, Blade cx, . "If ya plant corn, ya get c

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02-25-2011 07:14 PM  7 years agoPost 26
philip 01

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ft worth

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or just get a boca bearing and all will be good.

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02-25-2011 10:02 PM  7 years agoPost 27
Simmer

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Massachusetts

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+1 Boca

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02-25-2011 10:26 PM  7 years agoPost 28
lfalsetto

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COLORADO

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Could you give the Boca bearing no?

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02-26-2011 12:27 AM  7 years agoPost 29
Eagle2bravo

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Out flying somewhere

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+1 for the bearing number...please

T-rex 600n super pro , Trex 450 se, Gaui 200, Trex 500, Blade cx, . "If ya plant corn, ya get c

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02-26-2011 03:05 AM  7 years agoPost 30
BobOD

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New York- USA

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Interesting.

Is Boca getting bearings for oversized shafts from somewhere?

Not to knock Boca, they are a fine distributor but I would imagine their sourcing stuff made to the same industry standard as anyone else. I've seen SKF's and INA's lock up and they're pretty reputable manufacturers.

Team POP Secret

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02-26-2011 05:00 AM  7 years agoPost 31
philip 01

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ft worth

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the boca's work, were as the stock one's do not.

different bearing.

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02-26-2011 05:04 AM  7 years agoPost 32
TrevJonez

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St.George, Utah - USA

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http://www.bocabearings.com/bearing...HF1216-12x18x16

that is the one i am using with great results!

Who cares... its just money...

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02-26-2011 02:16 PM  7 years agoPost 33
Eagle2bravo

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Out flying somewhere

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Thank you sir...I'm going to order one.

T-rex 600n super pro , Trex 450 se, Gaui 200, Trex 500, Blade cx, . "If ya plant corn, ya get c

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HomeAircraftHelicopterAlignT-REX 600N › one way bearing advice please
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