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HomeAircraftHelicopterGasser Model RC HelicoptersOther › Predator pinion gear and clutch bell
02-02-2010 05:18 PM  8 years agoPost 1
flyinfriend

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North American continent

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Hi,

I'm in the process of a new build. I have the clutch bell with blocks out of my Predator gasser heli and when I pin the bottom bearing block to a table and turn the pinion/bell the whole upper bearing block rocks side to side and up and down. The pinion isn't running close to true between the two blocks. I'm wondering if the bearings aren't seated porperly and that is causing the alignment issue. This goes beyond the gear mesh being tight in a spot. It was actually wearing the frames slightly from all the rocking from just turning the head or engine to adjust mesh. I imagine if I started the engine it would have started to tear up the frames.

Thank you for any help,

Tom

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02-02-2010 06:01 PM  8 years agoPost 2
kogibankole

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albuquerque/ibadan

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Hey:

Good that you brought this up. I have the exact same problem. All brand new parts. Clutch bell, starter shaft, new bearings in the blocks, and brand new 14T pinion.

I sent the clutch back to century last week, I spoke with Robert at Heli-world/century and we decided that I would send him the rest of the parts, so we can find the culprit. I sent them out yesterday, and I cant wait to hear what they discover what is off.

Due to this issue I stripped 2 bolts on my ESS due to vibration from wobble. Good thing I caught it on time. These parts were all brand new BTW, so none were bent from a crash.

The pinion does not sit square on the clutch bell is my verdict. Why on earth?

if im not blade bogging youll find me pack puffing

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02-02-2010 08:04 PM  8 years agoPost 3
flyinfriend

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North American continent

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Hi kogibankole,

Glad to hear I'm not the only one. I feel if I had run it this way it would have torn up the frame mounting holes for the bearing blocks. My initial thought was it was a gear meshing issue but then I could see the bell raising and lowering as I turned it by hand. So I removed the assembly and if I hold the lower block the upper block moves in a beautiful gentle waving motion. Of course it wouldn't be too gentle at 10,000 rpm.

Please let me know what they say. I have an email to Paul at Century and I'm hoping they can make this right. This has been one challenging build. Ireferenced this link to Paul in my email so hopefully they will see it is not an isolated inicident.

Thanks,

Tom

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02-02-2010 08:23 PM  8 years agoPost 4
jschenck

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La Vista, NE.

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Really doesn't sound right. Both pinions I've had in my Predator run smooth and straight. Might try heating up the block and pushing the bearings out to see if you can tell if they were mounted flush/square. I'd suspect bearings not in straight as you mentioned. For sure don't fly it until it's right!

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02-02-2010 11:07 PM  8 years agoPost 5
kogibankole

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albuquerque/ibadan

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jschenck,
i pressed my bearings in square, if not they wont be smooth in the blocks. Its really easy to tell if the bearings are not in square. Mine with the pinion attached to the bell you can see a wobble up top with the pinion fully tightened on the bell.

if im not blade bogging youll find me pack puffing

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02-03-2010 12:47 AM  8 years agoPost 6
ron6460

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MASS THE GET F$*KED PAY! PAY! STATE

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SPECTRA !!
You should have got a Spectra !! Ron

" It was not me ! The sun was in my eyes Super Fly "

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02-03-2010 01:28 AM  8 years agoPost 7
rbort

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Franklin, MA - USA

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Ha!
Something tells me you're REALLY enjoying your Spectra Ron!!

-=>Raja.

MA 1005 Hanson 280, 4220 flts
Spectra 27 3DMax, 3310 flts
Whiplash V1-2 Hanson 300, 1618 flts
Whiplash V2 Hanson 300, 473 flts

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02-03-2010 02:14 AM  8 years agoPost 8
HOYTAB

rrNovice

Kingston NH

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hi i agree with ron.im starting to lean towards that. im new to gassers and the 1st 1 i bought was a used 1 from heli freik / smoking deal from fomby real nice guy to deal with!i love the cnc stuff or you could say the blings.my pred has every consevable option. the thing looks cool & flys great for the way i fly BUT @ century EVERYTHING I WANT IS ON BACK ORDER FOR 2 months.i think its a joke. poor quallity control. i get a set of metal blade grips / the arms are missing. in a factory sealed package.a year ago i was in the mood for yellow fly bar paddles to match my canopes & they came 2 tone.and im talking salt & pepper! the place kills me!and i can go on & on.be cause i want my stuff ready for the weekend the only thing i look foward to and if the part comes in wrong im one fire because the just f me up for the weekend.i dont care if its 25 out ill fly . a couple of cold ones and im good. as long as it aint to windy/ but you know what i like the wind its a challege.what do i have to lose my hair ! I HAVE NONE. i look @ the spectra g but it looks like it was made @ true value.i know in this forum everybody leans towards the spectra .but i love my pred!i havent had that problemo yet / i hope i dont.the problem is there over there working for $1.50 & a bag of rice . i hope i havent effended any body BUT I KNOW IM RIGHT!!!! and buy the way ron ive met you @ the 125 im from kingston nh right down the street. well have to get together.i had a bodyshop in haverhill in 88 in ayers village on 97.

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02-03-2010 03:33 AM  8 years agoPost 9
Billme

rrElite Veteran

MS

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HOYTAB,

I will send more rice, hehehe....thats funny!

Now, if I can get through this spectra commercial

Guys with the wobble, its either threads on pinion, or the bell was tapped at a angle...Just send it in and get it replaced...

Btw,, some folks pressing their bearing on need to put a block centered insiide under the bell..Do not allow the bell sidewalls to support press fit because the top is design for side loads, not vertical loads where the air holes are..This will bend the system also...

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02-03-2010 04:26 AM  8 years agoPost 10
jschenck

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La Vista, NE.

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EVERYTHING I WANT IS ON BACK ORDER FOR 2 months.
I hear ya on that - I personally haven't had troule buying parts but I haven't had to purchase too often either. I do know a guy around here that waited over 9 months for a main shaft a few years back

I *assume* the parts supply problem is behind them now as Century had a pretty dag-gum good sale on the Predators not too long ago. Most the parts for the Predator are listed in-stock at Century/Heli-world. except the G-10 fin-set which is the only part I really want right now

Still happy I bought the Predator though. If I stuff it in the ground $80 will get me a crash kit, don't know about now but 2 years ago when I bought it the same parts on the MA were quite a bit higher in price. That would have kept me from enjoying it as much. I've stripped a few crown gears and it annoys me to spend $20 when I do that but $40 for the MA crown gear which looks near identical would burn me up. Not that Predator parts are great prices either but they are lower. If/when Align produces a 700G I'll be taking a very serious look at it. But for now I'm going to enjoy my Predator, the mechanics feel 'right' and as long as I can keep it out of the dirt I think it'll fly great.

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02-03-2010 05:48 AM  8 years agoPost 11
oldfart

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Vancouver, Canada

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You should have got a Spectra !! Ron
Now does that mean I can go into any post here that discuss problems people have had with their Spectras and make a similar "nenner neener" comment?

I had thought we had all grown past such crap a couple of years ago.

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02-03-2010 09:40 AM  8 years agoPost 12
ron6460

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MASS THE GET F$*KED PAY! PAY! STATE

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Flyingfreind
He is my brother in law I am just having FUN !!!!! Ron

" It was not me ! The sun was in my eyes Super Fly "

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02-03-2010 03:29 PM  8 years agoPost 13
flyinfriend

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North American continent

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Thanks for the replies guys! I appreciate it, or most of them. The Spectra replies not so much.

Ron is my brother-in-law he is the one that 'made' me buy a gasser.

This is ALL his fault! LOL!!!

I am off to Home Depot during my lunch to find something that fits the bearing so I can block it up and press it in my vise to check to see if I can seat it properly. Will I need to heat it to do this? Is it secured with red Loctite? It really appears that it is seated properly on the bell, no visible uneveness, but as soon as I add the pinion on to the bell and spin it you can see the wobble. Putting the starter shaft up through you can see it is not centered within the pinion. If it is seated then I am going with BillMe's diagnosis and will be sending the bell, block, and pinion back for a replacement.

Thanks guys,

Tom

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02-03-2010 09:08 PM  8 years agoPost 14
AceBird

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Utica, NY USA

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I am off to Home Depot during my lunch to find something that fits the bearing so I can block it up and press it in my vise to check to see if I can seat it properly.
I am not in favor of a vice. The jaws are never true.

Just for visual..

Sockets work well for support.

Ace
What could be more fun?

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02-04-2010 12:38 AM  8 years agoPost 15
flyinfriend

rrApprentice

North American continent

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Hi all,

AceBird thank you for the advice and the visual, much appreciated.

I used a socket and blocked the back of the clutch bell with a large socket and attempted to ensure the bearing was seated properly on the bell by pressing it in my vise, (I wish I had access to press like your pic AceBird). There was no improvement in the wobble. So I am hoping to send it back tomorrow when I get an RMA back from Century.

I just want to say that Paul Pan at Century has been absolutely awesome in his support. My kit was missing the lower t-bearings for the main mast and Paul sent them out and I had them the next day. The manual doesn't show the spacer between the lower main mast bearing and the t-bearing, the only reason I knew of it was because of the threads about it here on RunRyder. BillMe answered my email with my question and he said he thought it was still required. I emailed Paul and got it in two days.

Here is 'shout out' for Paul Pan and BillMe for their help in this build. Also thanks to all who replied, even the Spectra guy...I mean my brother-in-law Ron.

Kogibankole please let us know what the outcome of your issue is, I'm quite positive we have the exact same issue. BillMe said the threads might have been cut at an angle.

Thanks,

Tom

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02-04-2010 01:41 PM  8 years agoPost 16
AceBird

rrElite Veteran

Utica, NY USA

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(I wish I had access to press like your pic AceBird).
The next best thing is a heavy duty (5"-6" cast iron)C clamp. You can grip the clamp in the vice as a third hand. You aught to be able to get one cheap on Ebay, tag sale. What makes it work is that the pressure is centered over what you are pressing in. You also have control of the pressure with the screw. A vice applies pressure off center to the resistive force which causes a moment (kocking angle). This cannot be prevented.

Ace
What could be more fun?

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02-05-2010 11:53 AM  8 years agoPost 17
kogibankole

rrKey Veteran

albuquerque/ibadan

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I spoke with Paul at century, and he said that they assembled what I had sent to them and there was absolutely no wobble at all. He told me that he would send it back to be so I could see for myself.

if im not blade bogging youll find me pack puffing

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02-05-2010 01:25 PM  8 years agoPost 18
AceBird

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Utica, NY USA

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he said that they assembled what I had sent to them and there was absolutely no wobble at all.
It is all in the details...

Ace
What could be more fun?

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02-05-2010 04:52 PM  8 years agoPost 19
flyinfriend

rrApprentice

North American continent

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Hi,

So did they just re-assemble the bearing in the block and bell and all was well, or were they saying there was no wobble in what they received?

I tried again to re-press the bearing. I don't have the tools to remove the bearing. It may have made it slightly better but it is not gone. I hope I get mine back with no wobble.

Thanks,

Tom

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02-05-2010 09:02 PM  8 years agoPost 20
ron6460

rrApprentice

MASS THE GET F$*KED PAY! PAY! STATE

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Bring it over
I will look at it Ron I told you to get a SPECTRA!!!! Take it easy guys!!! I would get another one again if the deal was around

" It was not me ! The sun was in my eyes Super Fly "

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HomeAircraftHelicopterGasser Model RC HelicoptersOther › Predator pinion gear and clutch bell
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