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HomeAircraftHelicopterAlignT-REX 700N › Align Clutchs
04-06-2010 01:03 PM  8 years agoPost 1
jasnlemons

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upstate, SC United States

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Has anyone noticed that the 700 clutch from align seems to be getting worse in quality! I have put three brand new clutchs in in the last two months and after the first crank up they are springing out so bad I am burning the clutch line in idle. I have replaced the bell twice just in case.

I am getting tired of this real quick.

Fly it like you stole it!
Stick Banging Expert

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04-06-2010 09:05 PM  8 years agoPost 2
jpla010

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Auckland, New Zealand

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Its not the clutches so mach as the clutch/liner gap which is sometimes too large from factory. If you have access to a lathe you can turn down the old liner a bit, epoxy in a new one and then turn that down to the correct clearance. Otherwise use a thicker liner or glue a piece of card behind the stock liner

Jonathon

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04-06-2010 09:59 PM  8 years agoPost 3
jasnlemons

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upstate, SC United States

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What is the clearance supposed to be.

Fly it like you stole it!
Stick Banging Expert

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04-06-2010 10:14 PM  8 years agoPost 4
USNAviationjay

rrElite Veteran

Houston Tx USA

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no issues with mine still on both stock ones.

I normally use TT clutch liners though when I do have to replace one.

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04-07-2010 03:39 AM  8 years agoPost 5
Kevin Dalrymple

rrKey Veteran

Indianapolis

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here is a link to replacing the liner

https://rc.runryder.com/t580665p1/

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04-07-2010 04:27 AM  8 years agoPost 6
jschenck

rrProfessor

La Vista, NE.

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What is the clearance supposed to be.
.008" (or .2mm)

Here is an example of what I did to fix one of my 50's clutch gaps. Had to do this for my 700 also. I used a Raptor 90 HD clutch liner on my 700 but it was too short so I had to use two pieces. It worked out really well, clutch feels right, idles right but starts to grab right above idle and spools up great. Wrap the clutch with one layer of black vinyl electrical tape and put the clutch in with the liner glued in place with epoxy. put the starter shaft in the clutch and bell to keep the clutch centered while the glue cures.

Measure the clutch and liner diameter before you start and you'll see what the difference is.

too much gap

clutch bell is at 42.2mm

clutch is 41.6mm - this makes a .8mm gap

it lasted less than one gallon.

relined it with a thicker liner and many gallons later the replacement clutch (exact same part number) is running just fine. After I was done the liner was just under 41.8mm. The first couple of times I started it the clutch was a bit grabby but after a few flights it was fine. I think that was due to a lower grade liner that didn't conform to the curve as well.

With my Trex700 the Raptor liner (blue) bent really nicely to the shape of the bell. The liner is way too tall and just a little short (1cm or so). I cut an additional chunk out of the 2nd liner (two come in a pack) and fit them in there. Once the liner was glued in place I clipped off the excess liner with some wire snips and sanded the edges smooth with a sheet of sandpaper layed across my workbench, running the bell in circles. Trex clutch has ran great since.

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04-07-2010 12:46 PM  8 years agoPost 7
jasnlemons

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upstate, SC United States

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Thanks for all the input guys. I will try this and see.

Fly it like you stole it!
Stick Banging Expert

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04-07-2010 02:18 PM  8 years agoPost 8
bkervaski

rrElite Veteran

Birmingham, AL, USA

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Lynx makes a Heavy Duty clutch and liner that are much better and not very expensive.

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04-08-2010 02:23 AM  8 years agoPost 9
Gernejr

rrKey Veteran

Miami, Fl

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Quick UK clutch is make for used clutch bell. I have had 1 show a hair line crack send QuickUK photo recieved new clutch about month later. I'm running new clutch bell now with QuickUk and had to sand down shoe and it's still on the tight side but will last a long time...

Sponsored by Visa

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04-09-2010 06:00 AM  8 years agoPost 10
Anthony.L

rrElite Veteran

Seattle, WA

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After breaking two clutches in my original 600N I've not trusted Align clutches since. Both my old 600N and current 700N have Quick UK heavy duty clutches and have worked flawlessly. If doing it over I would consider the newer Lynx heavy duty clutch.

Typically clutch issues lie in the fact they have too much clutch gap between the shoes and liner. The other issue is the actual material the clutch shoes are made from. Unfortunately Align has suffered from both.

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04-11-2010 12:09 PM  8 years agoPost 11
lightningrc

rrElite Veteran

UK

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Yer I fitted 3 in my 700 then changed to quick UK along time ago and no probs since.

The quick one is slightly over size and bits alittle at idle but does get better when your liner wears in.

Its twice the price of the Align ones but it seems you have to pay for quality.

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04-11-2010 03:15 PM  8 years agoPost 12
Four Stroker

rrElite Veteran

Atlanta

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I concur with jschenck, .008" is perfect AND .012" is worn out.

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04-25-2010 11:13 PM  8 years agoPost 13
TCP

rrElite Veteran

Kingsley, MI - USA

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quick uk and never look back, mine has been flawless in over a year.

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