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Date: Sat, 23 Feb 2013 13:04:48 -0500
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From: "Mark  Ravinski" <mjrav@comcast.net>
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Subject: Re: [LML] Nose Gear Strut
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Angier,
My guess is that the wheel bearings "broke in" and need to be tightened. 
Remember?  The nose wheel should not turn freely when given a spin.  The 
main wheel bearings probably loosened up as well.
Also check tire pressure.

Welcome to the world of Lancair maintenance.

Mark

--------------------------------------------------
From: "Greenbacks, UnLtd." <N4ZQ@verizon.net>
Sent: Friday, February 22, 2013 7:34 PM
To: "List Lancair Mailing" <lml@lancaironline.net>
Subject: [LML] Nose Gear Strut

> At the moment, my focus is intently riveted on my nose gear strut.
> On the 10th landing back at KBVY yesterday, I felt (for the first time), a 
> momentary vibration in my control stick. It was brief, maybe lasting 2 
> seconds. I have no idea what nose wheel shimmy feels like, perhaps one of 
> you with experience in this area could elaborate.
> So here's what I've got, my strut dates from 1995 and is not self 
> centering. I've got 4ZQ up on jacks and and when turning the nose wheel 
> from
> side to side, there is no sound that might indicate air bubbles inside. I 
> do notice that there is greater resistance when turning the wheel to the 
> left as compared to turning to the right. There is some evidence of oil 
> dampness on the strut. I have not yet removed the fork to see if there is 
> any oil pooling up inside. At this point, I'm guessing that if this were 
> the case, I would see it leaking down along the fork. I'm told by Ross at 
> the factory, that the principle cause of nose wheel shimmy is a lack of 
> fork oil, no oil....no dampening, etc.
> So my plan is to release pressure from the strut, check the oil level and 
> cycle the strut up/down until there is no sign of air bubbles. I got some 
> 20 weight fork oil from the local Harley dealer. My plan with the strut 
> extended and full of oil is to collapse the strut, close the valve, set 
> the plane on its nose wheel and re-pressurise the strut, and go fly.
>
> I'm all ears for nose strut advice/suggestions.
>
> Angier Ames
> N4ZQ
>
>
>
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