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T-REX 600 › ESP problem stripping main gear
08-06-2011 06:44 AM  6 years agoPost 1
kyoung

rrNovice

Woodland, CA

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I'm setting a Trex 600, with a Scorpion HK4025 630KV motor and will run it on 10 cells.

My problem is I keep stripping the main gear. Thankfully it happens before I get too high, and after 4 times it is getting to be big bother. I have checked the motor and I'm sure it is tight before I start up. I also have the ESP set for a soft start so there is no sudden burst of energy at start up.

Any ideas as to what may be causing this?

Thanks,

Keith

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08-06-2011 07:33 AM  6 years agoPost 2
2tall

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Crystal Lake, Illinois, USA

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I had a similar problem with my Trex 600E. It turned out to be a bad bearing in the top head block. I had converted the main blocks and bearings to KDE, and it was the thrust bearing in the top block that was intermittently grabbing the mast and stripping the main gear. In my case it was most prone during quick load changes on the main blades. You could really hear it screech as the teeth ripped off the main gear. Of course your issue could be entirely different. Good luck.

Jon

"Pay attention...lest the ground rise up and smite thee."

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08-06-2011 03:49 PM  6 years agoPost 3
kyoung

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Woodland, CA

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Jon,

I don't think this assembly uses a thrust bearing, but I can try replacing the main bearings that it does use. I'll replace the main shaft as well. I have no indication that the bearings or shaft are bad, but I'm willing to try anything at this point.

Also, yesterday when this happened for the fourth time, I noticed the head spinning freely just before the main gear shredded. I think the pinion came loose. It is possible the pinion has come loose each of the other times and I just didn't notice. I'm going to grind a flat spot on the motors main shaft to hold the pinion gear on better.

Thanks,

Keith

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08-06-2011 04:59 PM  6 years agoPost 4
Heli-on

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Southern Cali, CA - USA

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Check the motor bearings. There should be no lateral movement of the pinion. It's the most likely cause.

I'll assume you're setting your mesh properly. Use strip of paper to force the gap. Once you start stripping gears, you tend to over tighten the mesh. If it's motor bearings caasusing it, this will aggrivate the problem.

Make sure the one-way bearing isn't slipping and causing the gear to ride up.

I wouldn't replace the shaft unless it looks untrue. Roll it on a flat surcace like a piece of glass and look at the gap between the surfaces, you'll know if it's bent.

ESP stock stuff is using 15T pinion, so doubt low pinion tooth count is your cause. You could always convert to the Mod 1.0 slant gear.

I highly recommend a 3rd bearing block be added.

Make sure all of your frame bolts are tight, obviously the ones around the motor mount. There's a couple of places you can add additional frame spacers, too.

ESP stock main frames are 1.6mm, switching to CHP 2.0mm is a good upgrade.

One of those is bound to stop it.

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08-07-2011 12:04 AM  6 years agoPost 5
helixangle

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Mamaroneck, NY - USA

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+1 on the one way.

I seem to have a similar problem on my 550, with the exception it only knocks loose one tooth. Agreed I notice something funny when I go hard to fast load / off load, and the one way seems to be fetching up at times.

I was thinking to change my governor gain settings...???

Be sure the juice is worth the sqweeze
Remember life is hard...even harder for stupid people

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08-07-2011 12:09 AM  6 years agoPost 6
Heli-on

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Southern Cali, CA - USA

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Yeah, guess I should clarify that I don't mean the one-way bearing slipping while spinning, I mean lateral movement of the gear. Or to state it differently; How the one-way is bonded to the center hub is what I'm referring to. Sometimes it can move up enough where it starts munching main gears, but not high enough to start rubbing on the frame.

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