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Apr 28, 2019, 01:20 PM
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Trex 500 UH-60 Build Torque Tube Gear Issue

Need some help trying to figure out the correct main gear / torque tube main gear combination for my Trex 500 UH-60 build. I'm using the Align 500 Pro main shaft/500PRO Main Gear Case Set so that it works with the Pro Shaft and 500 Scale Fuselage Torque Tube Drive Gear HF5014. The torque tube drive gear and the Main Drive Gear will not or align properly for me to fit the Tail Boom assembly. Does anyone know what the working Main Gear/Torque Tube drive gear would be for this the UH-60 Build?
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Apr 29, 2019, 12:18 PM
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rotorist's Avatar
Cannot see the picture very well, it won't enlarge, but it looks like the drive gear for the torque tube is a little lower than the gear on the mainshaft.

On a frankenheli 450 build I did I had to put in a shim, between the upper and lower gears on the mainshaft, to center the drive gear.

Maybe try this ?


p.s. if I recall I also had to clearance the frame a little to get the gear low enough.
Last edited by rotorist; Apr 29, 2019 at 12:21 PM. Reason: addedstufftopost.
Apr 30, 2019, 03:57 PM
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I believe I found the the fix is install all the original 500 gear sets. I'll post an update as soon as my new parts come in.
May 10, 2019, 03:35 PM
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Contact Ed at Motion RC, he would be the guy that can help if anyone can. Good Luck, fishtx
May 10, 2019, 08:52 PM
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I hope you do find a fix but in future, when you are posting pictures that are helpful to sort out an issue, try and get a much higher resolution version because I could not see much of anything in the image aside from the circled holes. Along the same path using mismatched gear sets, I have had to slot out the frame of my 600EFL Pro so that the finer gear set (higher tail speed as a result) from the 600E/500EFL could be fitted. It is very typical to have to modify some components to get the desired results. Take care.


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