Logo 550SX pinion/main gear mesh - HeliFreak
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Old 07-18-2017, 04:20 PM   #1 (permalink)
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Default Logo 550SX pinion/main gear mesh

How can I easily tell if the motor pinion is meshing correctly with the main gear?

Too loose and I could strip the main gear teeth.

Too tight and I'll loose power and damage the motor bearings.

Does the old piece of paper between the teeth approach still work?

Any tips would be much appreciated.
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Old 07-18-2017, 04:54 PM   #2 (permalink)
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I use a strip cut from a baggie. fits easily. paper works as well. Still may require fidgeting since there are typically high and low spots. Best mesh IMO is lash at some or most of the gear and snug or no lash at the high spot
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Old 07-18-2017, 06:14 PM   #3 (permalink)
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I do it similarly, loosen the motor bolts, press the motor against the gear and hand spin it a few times. According to the directions there should be no lash, but if you aligned the center of the pinion herringbone against the main gear herringbone and there is no lash, but also no resistance from too tight an alignment, you should be good,

In fact last weekend, after replacing my owb, I was about .5mm high and had to pull my motor and drop the pinion slightly. That silly 1.5mm socket pinion set screw stripped and I spent 2 hours drilling it out, Replaced it with a 4mm set screw from a tail hub.
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Old 07-19-2017, 01:44 AM   #4 (permalink)
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What I think is more important is to get the vertical alignment of the pinion. Loosen to pinion grub enough so it can float on the motor shaft without spinning. Tighten the motor against the main gear as tight as you can then tighten the pinion up.

As mentioned the main gears are not perfectly round. I turn the main gear a little at a time and adjust it so there's just on no backlash at the highest point. Any more and there will be too much at the lowest point. Keep spinning and checking until happy.

Also be careful when installing the OWB, don't over tighten the screws otherwise you can warp the main gear causing a problem as well.
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Old 07-19-2017, 02:07 AM   #5 (permalink)
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Thanks guys.

I can't feel any high or low spots but it seems to rotate smoothly.

Does anyone put any lubricant on the teeth?
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Old 07-19-2017, 03:04 AM   #6 (permalink)
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no high / low spots? => lucky you... that happens, but not too often

i do never use any lubricant on my main gears... and nothing worn out / stripped since years - so can't be completely wrong

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Old 07-21-2017, 09:07 AM   #7 (permalink)
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I just line it up and push them together, little drylube and fly.
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Old 08-28-2017, 10:36 AM   #8 (permalink)
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Quote:
Originally Posted by Bugcatcher View Post
What I think is more important is to get the vertical alignment of the pinion. Loosen to pinion grub enough so it can float on the motor shaft without spinning. Tighten the motor against the main gear as tight as you can then tighten the pinion up.
The motor seems to provide conflicting info on this. On the motor counter-bearing support diagram it says to rest the pinion against the bearing and the shim, and that the main gear will float to center on the pinion.

Then on the other side of the page under "Installation of the Motor Pinion" it says to install the pinion loosely, align it vertically and then tighten the set screw.

With the counterbearing in place it's borderline impossible to get to the set screw, and the chances of moving the pinion while trying to get the screw tightened are pretty high. As long as the main gear floats as the manual says it should I think I'll go with method 1, setting the pinion height and letting the main gear align itself
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Old 08-28-2017, 07:20 PM   #9 (permalink)
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It is actually easy to get in and tighten the pinion set screw. It works so well and you know that it is perfectly centered that way. I did my Raptor E700 the same way.
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Old 08-28-2017, 11:37 PM   #10 (permalink)
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Idk if I would call it easy. The set screw is up high enough the plastic frame is in the way on mine. Don't really see a way to tighten the screw without moving the pinion alignment. There's a potential angle between the auto gear and frame, but i dont see how i would do it without moving the pinion

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Old 08-29-2017, 11:51 PM   #11 (permalink)
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I am not sure what is happening but I can slip my MIP driver into the grub screw easily. I added a photo for you . Hope it helps.
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Old 08-29-2017, 11:56 PM   #12 (permalink)
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You can see the driver hitting the frame in the picture and the alignment is not straight. Surely this would put an axial force on the pinion, moving it if it were not secured.

I believe that the only angle availble with a straight shot to the grub screw is here:


And it's not easy to get to without quite a long driver.

Seeing as the main gear has ~1mm axial play, it should be sufficient to rest the pinion on the shim and tighten. On my helicopter this brings the main gear into alignment nearly halfway between its maximum and minimum positions. Probably this is exactly what the engineers intended, and it's how I would design such a system myself.

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Old 08-29-2017, 11:58 PM   #13 (permalink)
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What ever works for you is great. I think you are over thinking it. I have had zero issue setting mine up this way and they do no move well I am tightening them . The one in the picture has 230 flights on the pinion and main gear this year and the backlash is still like it was when I set it up new and runs extremely quiet. Take care
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