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HomeAircraftHelicopterKyosho Caliber/Quest Neo-Caliber series › Caliber 30 one way bearing that is slipping.
03-31-2009 03:19 AM  9 years agoPost 1
faxaroo

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Wayne, MI USA

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Last flight in Feb. I broke teeth off of main gear. Picked up new gear and installed. Started to hover and engine hit rev limiter and blade free wheeled. Changed out one way and counter shaft. Checked new counter shaft to old with caliber, and both were the same. Hovered again same problem. Changed throttle curve to high stick 60 and was able to hover. If I unloaded the head engine hit limiter and blades free wheeled. I'm not sure what else to check, but heli seems okay. Any help would be appreciated.

Thanks,

Jesse

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03-31-2009 05:05 AM  9 years agoPost 2
DANBOONE

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Plymouth, IN 46563

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It seems like I had a simular problem on a Caliber 30 a couple years ago. When I changed the one way bearing it fixed the problem of the main gear getting trashed. In your situation is the clutch slipping? or is the one way not working? Can you tell if it seems to be one or the other?

Dan Lowry

Thunder Tiger Rep

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03-31-2009 06:23 AM  9 years agoPost 3
dkshema

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Cedar Rapids, IA

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An indication of a slipping one-way clutch is for the motor to run like a banshee, but the head doesn't turn, or slowly turns. Since you've replaced both the one-way AND the countershaft, it's a bit hard to believe that the replacements are bad, as well. If it happens on the ground, the motor spins up, but the head just kind of spins lazily on its own, if at all. If it happens in the air, your motor goes nuts and the heli drops.

Here's one thing to check, and something I just ran across this evening while troubleshooting a Caliber 5 that a friend of mine kind of "inherited" from someone who thought he wanted to buy a heli, but changed his mind after the purchase. It's possible that the clutch shoes are installed upside down on the clutch shaft. This would have the open end of the shoes actually facing the wrong direction, perhaps causing the clutch to act strange.

The clutch shaft has a shoulder on it, just above the LEFT HAND threads for the shoes. This shoulder fits into a recess in the center of the shoes, and allows the bottom end of the shaft to protrude beyond the bottom side of the shoes, and that protruding end is what contacts the black steel washer on the front bearing of the motor. If the shoes are upside down, the shoulder on the clutch shaft will be fully visible, sitting on top of the clutch shoes. If installed correctly, the top side of the shoulder will be flush with the top side of the shoes.

BTW -- the shoes are threaded on using a left hand thread. Righty loosey, lefty tighty, backwards from a standard thread.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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04-01-2009 12:06 AM  9 years agoPost 4
faxaroo

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Wayne, MI USA

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The clutch isn't slipping. If I spool the head up fast and give right rudder, I can get up to my 1700rpm limit. If I get the head above the rev limit, as in descending the motor hits rev limiter and I auto down.

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04-01-2009 12:17 AM  9 years agoPost 5
Helijost

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Pevely, MO - USA

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You sure the one way isn't spinning inside the gear? Kyohso makes a metal gear upgrade for this. I have seen if the gear the one way goes in, gets too hot, the ridges melt, and the one way can slip inside the gear. Its a long shot, but something I would double check.

Team Mikado USA

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04-01-2009 10:00 PM  9 years agoPost 6
tommytt1

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Mercerville, NJ, USA

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I personally, am on like my fourth one way clutch on my Cal 5. I don't know whose fault it is, but the last time I changed the one way, I also changed the shaft it grips on, and since than no problems other than it gets stuck once in a while. Tom

I made a mistake once, but I was wrong?

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04-05-2009 03:55 PM  9 years agoPost 7
faxaroo

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Wayne, MI USA

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Added tri flow oil to one way bearing and it seems to be working again. Talk to some guys at Toledo Show and they suggested tri flow instead of the ball diff. grease that kyosho calls out for. Thanks for the helpful posts.

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04-05-2009 04:25 PM  9 years agoPost 8
tommytt1

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Mercerville, NJ, USA

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I also use the tri-flow!

I made a mistake once, but I was wrong?

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04-05-2009 07:51 PM  9 years agoPost 9
dkshema

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Cedar Rapids, IA

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The best "lubricant" for the one-way clutch is to simply clean it in automatic transmission fluid.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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04-05-2009 10:04 PM  9 years agoPost 10
tommytt1

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Mercerville, NJ, USA

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I have done that also, as per DK's instruction Which type Dextron Mercon, F, etc.? I know that some trans fluids have slipping properties, and some grip. Tom

I made a mistake once, but I was wrong?

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04-05-2009 11:54 PM  9 years agoPost 11
dkshema

rrMaster

Cedar Rapids, IA

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Don't think I've ever seen a reference to the type used. Essentially you want to clean out any of the grease and dirt in the clutch, and you want to use something that won't attack the plastic or components. The clutch doesn't exactly need to be lubed in the normal sense, as for most of it's life, it is doing it's thing, being locked and driving the countershaft. When it IS doing the free wheel thing, it's only a couple of thousand RPM at most, and for relatively short periods of time.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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04-06-2009 02:32 AM  9 years agoPost 12
tommytt1

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Mercerville, NJ, USA

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Ya know, that makes alot of sense! Tom

I made a mistake once, but I was wrong?

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