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XHELI.COM . Autography FlightPower . Advantage Hobby

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Kyosho Caliber 30 & 60 - Concept - Nexus > Concept SR-T Secondary Shaft Bearing Problem
 
 
FSFirst
Heliman
Location: Auburn Hills, Michigan

I've been flying about 5 tanks thru my SR-T after replacing the clutch liner and installing the turbo fan. I noticed that during idleup the heli makes a "growling" noise. Upon closer inspection I notice small shavings coming from my counter gear. I dropped the engine and noticed that the counter gear was binding while in the frame. I split the frame enough to pull out the secondary shaft/bearings/counter/pinion gear out. The portion on the shaft that the larger bearing rides/loads against is an unmachined smaller diameter that allows the ID of the bearing to slap around on.

Should there be a spacer or something on the shaft to make up for this? While installed in the frame I don't see anyway to correct this other that applying JB Weld to fill this gap.

Has anyone else experienced this? Kyosho should have keep the same diameter the complete length of shaft for tight tolerance for the bearing. I don't understand the engineering here.
06-26-2002 Over year old.
 
 
Davidk
Heliman
Location: Pinnacle NC

bearing

check to be sure the fan has zero run out..
the bearing and the support on mine were fine . never had that problem
put new one in and fly it .. when i set the spaceing between the two i used two peices of paper between the two to set a close tollerance.. i do that with my nexus as well.
hope that helps
06-26-2002 Over year old.
 
 
Steve Campbell
Elite Veteran
Location: Baton Rouge, LA

Hmmm; that shaft should be a uniform diameter it's entire length. It has flats on one end for the 3mm grub screws that lock the pinion/counter gear assembly to it, and every one I've seen has the larger front bearing up against this assembly when it is placed in the frame moldings.

I've never been into that portion of an SR-T, but the way they cheapened up that version of the Concept, nothing would surprise me. No auto hub, BUSHINGS in the freakin' tail box, straight plastic as opposed to glass-reinforced nylon, etc., etc., ad nauseum.

Yuk.

Steve
06-26-2002 Over year old.
 
 
FSFirst
Heliman
Location: Auburn Hills, Michigan

I think I figured out what's wrong. That flat spot that you mentioned (Steve) should be inserted further into the pinion so the grub screws can lock into it. This is probably why when I replaced the tail wire it was about 3/8" too long. This heli was purchased as an ARF and it looks like it wasn't assembled properly. Can't trust anyone these days.

Is the pinion gear pressed on? I can't get it to budge at all on the secondary shaft. Might be corroded.
06-27-2002 Over year old.
 
 
concept1
Key Veteran
Location: Youngstown, OH

pinion should slide on snugly, but make sure the set screws are out far enough. luckly yours isn't like mine, someone glued all mine together, I had to totally dismantel the heli, separate the frame and remove complete assembly cause the bearings and pinion were glued to the shaft.
06-27-2002 Over year old.
 
 
Steve Campbell
Elite Veteran
Location: Baton Rouge, LA

Loc-titing the bearings to the shaft is a good idea. But that can be undone, if necessary, with judicious application of heat (I use a soldering gun). Using actual glue ain't too bright...

FSFirst, the shaft should be an easy "slide" fit into the pinon gear. You might want to consider replacing the existing soft pot-metal pinion gear with the hardened one. It isn't inexpensive, but does work much better and won't leave that messy residue on the main gear as it wears. That gray sludge is abrasive and will ruin the main gear in time.

Steve
06-28-2002 Over year old.
 
 
FSFirst
Heliman
Location: Auburn Hills, Michigan

I tapped the secondary shaft out of the pinion and found that I still have problems with this shaft. This shaft has a machined portion where the pinion slides on then a portion that has a smaller OD for the grub screws to lock on, then it jumps back to the larger machined OD then down again to another spot identical for grub screws to lock onto then back to the larger machined surface for the bearings to rest on. I can't shove it further into the pinion to use the 2nd flat spot because there won't be enough real estate .

Anyway it looks like this is the wrong shaft. So I put good old JB Weld on the second flat spot to fix this thing and it should be OK I hope.

Once again, you can't trust an ARF................
06-28-2002 Over year old.
 
 
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Kyosho Caliber 30 & 60 - Concept - Nexus > Concept SR-T Secondary Shaft Bearing Problem
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