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0| Malc1
rrKey Veteran EVESHAM,UK |
Spectra Main Gear / oneway bearing wear? Just checked the heli over after flying tonight and noticed that I have some up and down and slight side play on the main gear.
Its only on the main gear and one way bearing,the inner gear is fine.  What do I need to be loosening off and adjusting?The helis had approximately 2 gallons through it. |
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| gramey
rrApprentice United Kingdom |
 Malcolm have the two retaining collars slipped on the main shaft, the two between the bearing blocks one for each direction, i.e. one to stop it moving up and one to stop it dropping. Does the head move up and then down again as well, in which case if it does the top collar may be loose?
I can't think what else would allow this as there's a pin through the bottom of that assembly keeping it in a fixed position in relation to the main shaft, doesn't it? |
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| Malc1
rrKey Veteran EVESHAM,UK |
It may be normal  |
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| gramey
rrApprentice United Kingdom |
Malcolm, I've just popped out to the garage and checked mine and there's approximately 1mm tops of vertical play in my main gear. If you've got any more than that then perhaps you need to check that the four countersunk screws holding the main gear to the one bearing have not backed out? |
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| Malc1
rrKey Veteran EVESHAM,UK |
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| lejon
rrVeteran Las Vegas, Nevada |
I had this issue and when I replaced both items it went back to specs. The instructions indicate that the gear should rotate freely but there should be little or no vertical play. They go on to say that if needed install tyhe 0866-13 (thicker shim) and if there is no free play and a little friction then that will work since the Telfon wil quickly break in. Page 21 in my manual and picture is drawing 3.Lejon |
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| Malc1
rrKey Veteran EVESHAM,UK |
I have ordered the parts anyway. |
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| gramey
rrApprentice United Kingdom |
Malc, you should have had two shims of different thickness in your kit, it say'sC) Select the previously assembled autorotation, the #0840-6 dowel pin, the #0866-10 shim
ring, the #0866-11 Teflon O-ring and the #0866-12 collar. It should now be determined which (or both) shim rings (#0866-10 and/or #0866-13) are required. Invert the autorotation assembly and note the Oilite bearing exposed at the base of the housing. A shim ring should always be placed next to this bushing. As a trial, install the #0866-13 M14.0X20X0.1 shim ring followed by the teflon O-ring and the black retaining collar. Temporarily insert the #0840-6 dowel pin through the collar (large I.D. hole) and into the autorotation sleeve. Rotate the outer main gear against the inner and check for smooth rotation. Move the gear up and down between the upper gear and the retaining collar. The desired situation is to have the gear rotate freely but have very little up/down play. If it is too loose, substitute shim ring #0866-10 for shim ring #0866-13. If there is no free play and the rotation is with very light friction, it can remain as is since the teflon O-rings will break in quickly. It should be noted that there is no operational problem or risk even if the unit develops as much as 0.5mm of free play (at your option the O-rings could be replaced or shim rings added).It may be that you need both shims although I found replacing the thin one with the thick one was sufficient. |
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| Malc1
rrKey Veteran EVESHAM,UK |
Need to see really how much play it actually is over the 0.5mm allowed. |
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 rbort
rrProfessor Franklin, MA - USA |
FWIW Mine has "pretty good" up and down play in it but I don't sweat it. But then again, I have over 200 hrs on mine. I did reshim it one time to get it a little tighter, but go fly the crap out of it and eventually it will redevelop the slop due to the teflon ring wearing.I would say as they say you can have some play and its not an issue in the operation of the unit.-=>Raja.Spectra 27 3DMax, 3460 flts Whiplash V1-2 Hanson 300, 1995 flts Whiplash V2 Hanson 300, 923 flts |
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 Justin Stuart (RIP)
rrMaster Plano, Texas |
Scorpion Power Systems Thunder Power RC Kontronik Drives |
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| rbort
rrProfessor Franklin, MA - USA |
Yeah really Malcolm, was the picture in your post taken before you ever flew the helicopter? Spectra 27 3DMax, 3460 flts Whiplash V1-2 Hanson 300, 1995 flts Whiplash V2 Hanson 300, 923 flts |
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| Malc1
rrKey Veteran EVESHAM,UK |
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