REFLECTOR:RE: main wheel/brake shutter

Scott Derrick reflector@tvbf.org
Sat, 19 Apr 2003 15:07:42 -0600


When I installed new gear bolts(ordered from the factory) I got a 
plastic insert lock nut with each bolt. I put a dab of fingernail polish 
on the nut to verify it hasn't moved since I last tightened it.

Scott

Chris Martin wrote:
> Tom,
> 
> This is a periodic adjustment that should be made due to creep and use of
> the retract gear. A castle nut would not give you the fine tune adjustment
> required. I prefer to use a jamb nut on top of the main nut of the two main
> gear bolt. For the nose gear bolt I use a plastic insert type of lock nut.
> 
> Chris Martin
> 
> 
> 
>>[Original Message]
>>From: Tom Martino <tmartino@troubleshooter.com>
>>To: <reflector@tvbf.org>
>>Date: 4/19/2003 10:46:10 AM
>>Subject: RE: REFLECTOR:RE: main wheel/brake shutter
>>
>>Why don't they use castle type nuts on the main gear pivots (with cotter
>>pins)?  Wouldn't this be a better arrangement for holding the right
>>amount of torque and taking away the worry of them coming loose?
>>
>>
>>-----Original Message-----
>>From: Scott Derrick [mailto:scott@tnstaafl.net] 
>>Sent: Saturday, April 19, 2003 12:29 PM
>>To: reflector@tvbf.org
>>Subject: Re: REFLECTOR:RE: main wheel/brake shutter
>>
>>I put large washers in between the bulkheads and the leg bushing to 
>>eliminate any sliding movement on the pivot bolts.  This was recommended
>>
>>by the factory A&P.
>>
>>This also allows you to keep the two legs in alignment so there is no 
>>binding in the gear mechanism as the legs retract.
>>
>>My through bolts are just tight enough so their is no play in the bolt, 
>>but there is very little squeezing pressure being applied to the forward
>>
>>  and rear bulkheads.
>>
>>Scott
>>
>>Chris Martin wrote:
>>
>>>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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>>>
>>>
>>>
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