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Home✈️Aircraft🚁HelicopterGasser Model RC HelicoptersOther › Spectra crown gear issue
04-03-2010 01:09 AM  10 years ago
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Sean Bosse

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Germantown, MD.

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Spectra crown gear issue
So it was a beautiful day today and I decided to take my spectra out to continue breaking-in the engine. After playing with the H/L needles trying to get the A/F mixture right, I decided to alter the throttle curve to raise the head-speed. After doing this, my head-speed was too high at hover, so, when I brought the heli down after about a min. or so. I noticed white plastic everywhere from the crowngear wearing. I've put almost two gallons through the heli so far, so I know the gear has been worn in already. I took it out for another flight and after five min. I noticed there was a clicking noise coming from the gears. This time, there was more plastic covering the heli and a lot of play between the crowngear and the front tail-drive gear. Everything else is tight and I know the tail-drive gear didn't move forward, but the crowngear is now trashed. Does anyone know what may have caused this, or has anyone had a similar problem? Also, does anyone have a spare that they would like to sell?

Thanks,
Sean
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04-03-2010 02:06 AM  10 years ago
pphil611

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South Dakota

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crown gear
Sean
seems your not having alot of luck. I think I would check the split collars on the main shaft. Piece # 0875-1. Also you can set the heli on the ground and holding the head try to push it up and down, there should not be any play or movement.
luck!!
Spectra-G, MAH, CSM
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04-03-2010 05:04 AM  10 years ago
Justin Stuart (RIP)

rrMaster

Plano, Texas

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Can the split collars on the main shaft really let loose like that?Avant RC
Scorpion Power Systems
Thunder Power RC
Kontronik Drives
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04-03-2010 05:26 AM  10 years ago
lejon

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Las Vegas, Nevada

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Check the set screws for the the tail gear
If you notice the gear can be moved up and down on the shaft and that will change the mesh of the metal gear to the white plastic bevel gear. Check to see how much play there is. It is possible that the set screws loosened and the gear slid increase the mesh.

Just my 2 cents.

Lejon
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04-03-2010 06:01 AM  10 years ago
Sean Bosse

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Germantown, MD.

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Thank you guys.

While I was at the field, I checked both vertical play in the main-shaft and horizontal play on the tail-drive gear, both were tight. I also checked the set screws on the tail-drive gear and they were tight too. I'm not sure what the cause was.
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04-03-2010 09:11 AM  10 years ago
carpman

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Spain

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You will get white dust/powder from the gears as they are meshing in, I still get it now sometimes but everything is set as good as it can be...

If it is just a fine dust of white I wouldn't worry too much after only 2 gallons of light flying, still check the things the guys have mentioned...
KEVIN
Trex 500ESP | Trex 600NSP | Trex 700 Gasser | MA Spectra G
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04-03-2010 03:59 PM  10 years ago
Sean Bosse

rrApprentice

Germantown, MD.

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Thanks carpman, but its not fine dust and the crowngear is worn so bad where the tail-drive gear makes contact that there is a visible ridge where there isn't any contact. I'll try to load a pic later.

Sean
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04-03-2010 04:41 PM  10 years ago
carpman

rrVeteran

Spain

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OK that doesn't sound so good then!KEVIN
Trex 500ESP | Trex 600NSP | Trex 700 Gasser | MA Spectra G
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04-03-2010 05:18 PM  10 years ago
j.8

rrVeteran

Denmark

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Hi Sean

Are you sure that the #0232 pinion gear is in the right
position, it`s the only thing in contact with the crown gear,
try to move it back and forth.

Even though the main aksel sits firmely, perhaps the teflon
o-rings that keeps the main gear in place are worn, se if
you can move the main gear it self up and down.

Regards Bo
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04-04-2010 01:41 PM  10 years ago
AceBird

rrElite Veteran

Utica, NY USA

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but its not fine dust and the crowngear is worn so bad where the tail-drive gear makes contact that there is a visible ridge where there isn't any contact.
This suggests poor alignment...
Ace
What could be more fun?
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04-06-2010 12:07 AM  10 years ago
gramey

rrApprentice

United Kingdom

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Had you backed the tail drive gear off when you checked for vertical play in the main shaft, also is the ridge on the inside or outside of your crown gear? My Spectra ate two crown gears in the time I had it, I eventually solved it by putting the extra shim in on the main shaft to eliminate the slight free play I had. Any that is left you take out by pulling up on the main shaft before nipping up the split collars. It's no good trying to do this without the tail gear being clear of the crown gear. Adjust your main shaft and then set your gear mesh.I then took considerable time ensuring that the gears were meshing so that both were absolutely flush with each other at both edges.
I hope you get it sorted.
Dumb thumb specialist
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04-06-2010 01:00 AM  10 years ago
Sean Bosse

rrApprentice

Germantown, MD.

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Thank you for the input Gramey. I'll work on fixing that sometime next week.

Sean
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04-06-2010 02:49 AM  10 years ago
rbort

rrProfessor

Franklin, MA - USA

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Make sure you don't mesh it too tight
It should have 'some' play back and forth just a little bit of rocking as zero play will make alot of whine noise and wear the inner gear prematurely.

I had to add a 30 thousands washer between the top of the crown and the bottom of the bearing block on the main shaft to achieve this play while I pulling the mainshaft up snug.

I thought about moving the crown but it looked centered so I did this instead.

Just a thought to keep it in mind.

-=>Raja.
MA 1005 Hanson 2703D, 4400 flts
Spectra 27 3DMax, 3460 flts
Whiplash V1-2 Hanson 300, 1995 flts
Whiplash V2 Hanson 300, 923 flts
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