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HomeAircraftHelicopterGasser Model RC HelicoptersOther › Predator gasser rear tail gears
05-15-2011 02:34 AM  7 years agoPost 1
skyking1

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Zanesville, Ohio

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I just rebuilt the tail assy on a Predator SE. The manual says the rear gear mesh is not adjustable and the gear mesh will be tight until the break in.

How tight is too tight? I bought new everything. Input shaft, output shaft 14 tooth / 13 tooth metal gear set, all new bearings, tail cases etc.

Assembled exactly per the manual. 14 tooth gear on the input shaft, 13 tooth on the output shaft.

Spacer on output shaft, 2 of the very thin washers on next.

Everything turns somewhat tight and I can feel like a "high-spot" in the gears. When turning you feel a tight spot every turn like one or both the gears are not ground perfectly. I don't have the boom on the heli yet as I have spent a ton of time on this issue. I'm afraid this will wipe out the bevel gear. I have probably spent $125.00 in parts and still have a pile of junk.

Really get discouraged with this heli. Just about ready to get of rid of all my Century stuff and forget it.

Any help would be greatly appreciated.

Thanks

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05-15-2011 02:44 AM  7 years agoPost 2
Helizrule

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Lake Ariel, PA

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I feel your pain. I found with Century stuff you need to remove and add spacers "AS NEEDED". Try removing the very thin washers one at a time.

One mile of road will take you one mile. One mile of runway will take you anywhere in the world.

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05-15-2011 03:24 AM  7 years agoPost 3
Gearhead

rrMaster

Vt

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even Vetts have problems at times,

did you look at the Teeth on those Gears one may have a bur on it, there has been NO complaints on those Gears that I can remember

"AS NEEDED",, yes, shimming those gears would be much better than just throwing them together without shims

Jim
Buzz Buzz Buzz

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05-15-2011 03:27 AM  7 years agoPost 4
skyking1

rrApprentice

Zanesville, Ohio

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I tried them with one shim washer - was too loose. 2 seems right. But I think you are correct - one of the gears must have a burr on it.

It just seems that the parts should be correct to start with.

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05-15-2011 03:41 AM  7 years agoPost 5
Billme

rrElite Veteran

MS

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What creates the high spot would be tightening the set screw to tight..This can happen on any machine.. You want to use loctite on the shafts so as to not have to tighten down to hard on the gear...I have had to watch this on any machine I have owned that uses tail gears..

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05-15-2011 03:54 AM  7 years agoPost 6
Helizrule

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Lake Ariel, PA

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Good one Bill, I never thought of that as an issue.

One mile of road will take you one mile. One mile of runway will take you anywhere in the world.

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05-15-2011 04:35 AM  7 years agoPost 7
skyking1

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Zanesville, Ohio

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Thanks - that is a very good point. I will check that tomorrow.

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05-20-2011 07:09 PM  7 years agoPost 8
mrford

rrApprentice

elmwood park nj usa

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tail gears
If its just one high spot you could put tooth paste like lapping compound take one easy hover than clean thouraly and you will have perfect gears . If there is a high spot thats not right if you set to high spot it will be to louse

fly happy live long

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05-31-2011 05:38 AM  7 years agoPost 9
Scorpion

rrApprentice

Socal USA

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pictures
does anybody have pictures about this tail gear issue? it would be very helpfull for other new Ryders with the same issues................just a thought
thanks

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05-31-2011 06:24 AM  7 years agoPost 10
steve9534

rrKey Veteran

yakima, wa.

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Predator T/R
The Predator actually has one of the more bulletproof T/r gear boxes out there. I've torn up gears on almost every heli I've ever owned, but the Predator has been fool proof. I don't know where you got the info that the mesh is not adjustable, but it sounds as if you've figured out that you can adjust the mesh by adding or removing shims. I usually use one or two and prefer that the mesh be a little tight from the start. The gears will wear in as you fly, and unless it's very tight, they will be just fine. As Billme has suggested, the gears will run out of true when you tighten the set screw. John Benario wrote a whole column on this issue some years ago and he would shim the gears on the shaft to get them true. My own experience is that it's really not necessary to do that, and they will wear in with time so the gear box turns very smoothly. The problem I had was with the T/R gear box rotating on the tail boom. I use JB weld to glue the gear box in place and have not had any other troubles. Hope this helps. steve.

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