REFLECTOR:RE: main wheel/brake shutter

[Chris Martin]

Pat,

Try tightening the through bolts at the main pivot points for the nose gear
and the mains. This was my biggest problem and solved almost all of my
shimmy. Put the plane up on jacks and cycle the gear up. Place a box or
some sort of 6 inch high block on the ground where the wheels come down.
Then dump the emergency hydraulic release and let the gear down. The gear
will stop on the blocks allowing you to lift them and feel the side to side
play. I think you will find that use has loosened it up considerably.
Lubricate the pivot points and tighten them up as much as you can without
binding the gear. That should fix most of the shimmy.

Let me know if it helps.

Chris


> [Original Message]
> From: Pat Shea <xl340hp@yahoo.com>
> To: Chris Martin <christophercmartin@earthlink.net>
> Date: 4/17/2003 11:32:51 AM
> Subject: main wheel/brake shutter
>
> Hi Chris,
>
>  Just thought I'd drop you a note to let you know
> you're not the only one having brake shutter problems.
> Although I had taxied my plane in the past up to about
> 40mph w/ no problems, now if I hit the brakes around
> 40mph I get a pretty bad main wheel/gear shutter until
> the speed drops below 20mph. There is no problem until
> I touch the brakes or after I release them. It
> definitely won't pass the 'friends and family' test.
> Of course, I've made a few changes since those initial
> successful taxi tests: upgraded to the 600XT's
> calipers, upgraded to the steel discs, upgraded to the
> bi-metal pads, replaced my tires/tubes, changed the
> brake lines, adjusted the toe-in, replaced my nose
> wheel, painted the plane... How's that for a few
> variables?? 
>  Anyway, Scott Swing thinks the problem may be a
> variation in the disc thickness - George at Matco
> doesn't... I need to measure it. I still have my old
> disc which I plan on re-installing to see if that
> makes any difference. I did have a some pretty good
> disc run-out (more than 1/16") which I shimmed away -
> that fix had zero affect on the shutter. George has
> offered to check my brake/disc/wheel setup. My wife is
> due to deliver #2 in 2 weeks so I probably won't miss
> those parts too much for a while...
>
> Best of luck, Pat 
>
>
>
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