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Home✈️Aircraft🚁HelicopterGasser Model RC HelicoptersOther › Spectra Main Gear / oneway bearing wear?
09-17-2009 08:56 PM  11 years ago
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Malc1

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EVESHAM,UK

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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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09-18-2009 01:47 AM  11 years ago
gramey

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United Kingdom

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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?
Dumb thumb specialist
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09-18-2009 03:16 AM  11 years ago
Malc1

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It doesn`t look like the main shaft moves at all.

If you hold the main gear and lift it it moves between the inner gear and nothing really.

Nothing else moves apart from the main gear.The play is only below the inner gear.

Its like the play is in the oneway bearing or somewhere near.

Have you got any on yours at all?
It may be normal
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09-18-2009 10:13 PM  11 years ago
gramey

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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?Dumb thumb specialist
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09-18-2009 10:18 PM  11 years ago
Malc1

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Thanks Graham I`ll recheck things tomorrow to see if mine is exactally the same.
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09-18-2009 11:18 PM  11 years ago
lejon

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Las Vegas, Nevada

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Malc1, also you might want to check (if I remember correctly) the Teflon "O" ring and the shim ring(s). Part numbers 0866-10 and 0866-11 & 0866-13.
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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09-19-2009 05:21 PM  11 years ago
Malc1

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Thanks Lejon

Just the info I was looking for.

I have spotted it but do I need to get it changed over straight away do you think?
I have ordered the parts anyway.
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09-19-2009 08:27 PM  11 years ago
gramey

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United Kingdom

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Malc, you should have had two shims of different thickness in your kit, it say's

C) 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.
Dumb thumb specialist
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09-19-2009 09:29 PM  11 years ago
Malc1

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I`m sure that when I assembled it originally it was spot on.

This has appeared after 2 gallons.
Need to see really how much play it actually is over the 0.5mm allowed.
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09-20-2009 12:29 AM  11 years ago
rbort

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Franklin, MA - USA

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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.
MA 1005 Hanson 2703D, 4400 flts
Spectra 27 3DMax, 3460 flts
Whiplash V1-2 Hanson 300, 1995 flts
Whiplash V2 Hanson 300, 923 flts
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09-20-2009 01:20 AM  11 years ago
Justin Stuart (RIP)

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Plano, Texas

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Malcolm, was the picture in your post taken before you ever flew the helicopter?Avant RC
Scorpion Power Systems
Thunder Power RC
Kontronik Drives
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09-20-2009 01:26 AM  11 years ago
rbort

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Franklin, MA - USA

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Yeah really
Malcolm, was the picture in your post taken before you ever flew the helicopter?
Actually I was thinking the same thing as that looks BRAND NEW and once you fly it there will be white shavings of the gear showing on the CF plates...

I thought the picture was just illustrative and nothing else myself...

-=>Raja.
MA 1005 Hanson 2703D, 4400 flts
Spectra 27 3DMax, 3460 flts
Whiplash V1-2 Hanson 300, 1995 flts
Whiplash V2 Hanson 300, 923 flts
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09-20-2009 11:07 AM  11 years ago
Malc1

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EVESHAM,UK

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Yeah of course it was - in the building stage.

I`ve had all the plastic shavings thing even after two gallons I still get a little bit.

Regarding the slop - I`ve ordered the spares ,I`ll fly a bit more I think.

Still on the rebuilt engine so still have to change over to the 40.1 mix yet (just about to before the pipe problem again)
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