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Zoom › belt drive and main gear
10-24-2004 03:45 AM  13 years agoPost 1
Opfor

rrApprentice

Loudon, Tn

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Just installed the new belt drive system and everything has been working fine but I'm starting to get some major wear on my main gear.

It seems that after disassembling again for the 3rd time that the main is moving up and down the autorotation sleeve set (m009) about an 1/8". IS THIS NORMAL? If I could keep it up and locked I would not have it rubing the frame and solve my problem. It's more than just a little white dust, this last test flt had white shavings.

I've never noticed this before and didn't know if this is a new problem or they all do that.

After modifying the frame with the hubdave belt assy, I'm wondering if I've got something wrong or why this main has so much travel on the sleeve set.

Appreciate any advice.

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10-24-2004 08:56 AM  13 years agoPost 2
Hardcarve1

rrNovice

Australia

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Yes the main gear will move up and with the Hubdave belt mod and the chances are that the top of the tail drive gear will make contact with the base of the elevator seesaw.
This is what I did
To stop the main/tail assembly being pulled over because of the tension on the belt and the slop in the Sprag bearing place a spare main mast bearing in the top of the Hubdave tail drive gear. This will reduce the slop in the main gear heaps. You may need to put some shrink wrap on the outer bearing case so that it's it will be a tight fit into the Hubdave tail gear. Then order another mast collar and place this on top of the bearing you just placed in the Hubdave tail drive gear. This will stop any vertical movement in the main gear assembly.
On my setup I have a collar above the top bearing to stop downward movement. A collar below the top bearing to stop upward mast movement. Then a collar above the main/tail drive gear to stop the upward movement of the gears, and then the auto hub stops the maingear moving down. Had to lift the main gear up a fraction so that the belt exiting the tail boom spooled onto the tail drive gear level. this ment the the bottom of the mast just floats on the lower main mast bearing. My setup runs like a Swiss watch now with no sign of wear at all.
Alex

When in doubt...................rev it out

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10-24-2004 01:45 PM  13 years agoPost 3
BlakeMcBrayer

rrElite Veteran

Georgetown, Ky

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I f you have HibDaves newest kit, then it had the bearing for the belt drive main pulley, if not here is a link where you could order them cheap: http://www.bocabearings.com/main1.a...d=17&n=MR105-ZZ

Where are your 2 main collars at now? I misunderstood his instruction when I first put mine together. We were email chatting about some other things when collar placement came up. I had one collar abve the top main bearing and one below. According to him, the one above was not needed. It should be one below the top main and the other on top of the gear & pulley assembly.

You can also adjust the placement of the auto collar so that there is no gear rub on the lower side of the frame. Simply move it up untill there is no contact and lock the set screw. Then slide the collar down on the top of your gear assembly and the hole thing will be locked down.

Don't come off the throttle untill you see your GOD!

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10-24-2004 02:39 PM  13 years agoPost 4
rerazor

rrElite Veteran

Mich.

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If you use the Hubdave kit you should have the following.

A bearing in the main pulley, then a mast collar on top of that bearing and another mast collar on the bottom of the top bearing.

Basically, the main shaft is held by two mast collars and the set screws of the oneway bearing.

There is no way the shaft or main gear or belt pulley can move up or down.

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10-24-2004 03:19 PM  13 years agoPost 5
Opfor

rrApprentice

Loudon, Tn

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Yes, there is a way the main gear can move up and down, maybe it's not right but mine is.

I do have the new Belt kit with the new bearing.
I read this thing over several times and even emailed hubdave himself. This is how mine is setup. I have a stopper under the upper bearing and one about an 1/2" below it on top of the new bearing that goes into the tail pulley.

Isn't the auto rotation sleeve set ( m009) different from the one way bearing? The autorotation sleeve is the one that is black with the 2 set screws. This is where I see and can move the main gear up and down.

Reading your post Blake if I lock the 2 set screws in place then that SHOULD lock the autorotation sleeve in place, whether it is up or down is based off of where I lock it?

Thanks for all the input.

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10-25-2004 12:27 AM  13 years agoPost 6
BlakeMcBrayer

rrElite Veteran

Georgetown, Ky

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The sleeve is what the auto bearing grabs when under power or releases to auto. To take the movement out, loosen the 2 sets on the sleeve and move it up as far as it will go. You can even apply a small amount of pressure with a screwdriver, then retighten the sets. This should stack everything up with no play.

Here is how I set mine and another one up. Insert main into top bearing, then put 2 collars on shaft. Next slide thru gear assembly with sleeve in auto bearing. Lastly into the bottom bearing. It will only go about half to 3/4 of the way thru the lower bearing. After everything is in, reattach the swash plate links (all 3). The links will set the height of the main shaft. Make sure your shaft is in the lower bearing at least half way after installing the links. Now set the sleeve height so that it holds you main gear assembly off the lower part of the frame where the gear usually rubs. just high enough to not rub. put a small down pressure on the bottom collar agaist the bearing in the pully and tighten set. Raise the top collar against the upper main bearing and tighten.

Don't come off the throttle untill you see your GOD!

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10-25-2004 12:32 AM  13 years agoPost 7
rerazor

rrElite Veteran

Mich.

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Thats exactly the way I do it.

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10-25-2004 02:48 AM  13 years agoPost 8
Opfor

rrApprentice

Loudon, Tn

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Thank you Blake for the in-depth explaination. I will definately give it a shot following those steps.

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10-25-2004 10:53 PM  13 years agoPost 9
BlakeMcBrayer

rrElite Veteran

Georgetown, Ky

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No problem at all, that is what RunRyder is for. How do you think I figured it out?

Don't come off the throttle untill you see your GOD!

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