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07-25-2014, 11:31 PM
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Join Date: Nov 2010
Location: West Linn, Oregon
Posts: 1,351
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I've been experiencing this issue and even went so far as to order some of the main leg stiffeners to install. As I was working my way through my annual I found my nose wheel was now only taking about 18 pounds of force to rotate versus the 26 lbs Vans recommends in the plans. Those belleville washers definitely smoothed out (I had pre-sanded them a bit too). I also found my nose wheel was under inflated as well. Hopefully that will be the shake I've been feeling.
Just to go back to what Mike started the thread with, be sure to check out the mechanics of the wheels to see if something else is going on.
__________________
CharlieWaffles - But you can call me " Mark"
RV-10
N928MT
Flying - AKA Still Tinkering
Build Project Site
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07-26-2014, 02:49 AM
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Join Date: Jun 2006
Location: Delaware, OH (KDLZ)
Posts: 4,196
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Quote:
Originally Posted by CharlieWaffles
I've been experiencing this issue and even went so far as to order some of the main leg stiffeners to install. As I was working my way through my annual I found my nose wheel was now only taking about 18 pounds of force to rotate versus the 26 lbs Vans recommends in the plans. Those belleville washers definitely smoothed out (I had pre-sanded them a bit too). I also found my nose wheel was under inflated as well. Hopefully that will be the shake I've been feeling.
Just to go back to what Mike started the thread with, be sure to check out the mechanics of the wheels to see if something else is going on.
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I had the shake happen twice.
Then I too noticed that the nose wheel torque had dropped to about 10lbs. I tighten it up to about 30lbs. I haven't had a shake incident since.
I also believe that the Planearound spacers on the wheel bracket help tremendously in damping any oscillations over the plan fabricated spacers. If you don't have them installed, I would highly recommend them.
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07-26-2014, 03:07 AM
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Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 10,011
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Quote:
Originally Posted by CharlieWaffles
I've been experiencing this issue and even went so far as to order some of the main leg stiffeners to install. As I was working my way through my annual I found my nose wheel was now only taking about 18 pounds of force to rotate versus the 26 lbs Vans recommends in the plans. Those belleville washers definitely smoothed out (I had pre-sanded them a bit too). I also found my nose wheel was under inflated as well. Hopefully that will be the shake I've been feeling.
Just to go back to what Mike started the thread with, be sure to check out the mechanics of the wheels to see if something else is going on.
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Are you greasing the Belleville washers?
__________________
Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ
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07-26-2014, 08:56 AM
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Join Date: Nov 2010
Location: West Linn, Oregon
Posts: 1,351
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The only grease in that area was done via the zerk fitting after assembly. When applied it will ooze out between the washers. So in that way yes, they are greased.
__________________
CharlieWaffles - But you can call me " Mark"
RV-10
N928MT
Flying - AKA Still Tinkering
Build Project Site
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07-26-2014, 10:37 AM
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Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 10,011
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Quote:
Originally Posted by CharlieWaffles
The only grease in that area was done via the zerk fitting after assembly. When applied it will ooze out between the washers. So in that way yes, they are greased.
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The Bellville washers on my Tiger are specifically called out for a grease application (Aeroshell #6 or equiv.) every 100 hours.
To apply the grease, the nose gear swivel must be removed, the washers cleaned and re-greased, re-assembled and the break out torque adjusted.
Since the system is identical to that on the RVs, it seems like a good maintenance practice.
Does Vans provide any specific maintenance instructions for the Bellville washers?
__________________
Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ
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07-26-2014, 07:03 PM
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Join Date: Nov 2010
Location: West Linn, Oregon
Posts: 1,351
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No guidance from Vans that I know of. I think one of the reasons this happens is that there is nothing in the plans about greasing the zerk fitting up there, so most people are setting the breakout with a dry configuration and when its greased later on, the breakout is greatly reduced.
__________________
CharlieWaffles - But you can call me " Mark"
RV-10
N928MT
Flying - AKA Still Tinkering
Build Project Site
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07-26-2014, 09:19 PM
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Join Date: Jan 2010
Location: Southern Michigan
Posts: 1,966
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I notice a shopping card shimmy today during taxi for take-off. Time to investigate.
__________________
David C.
Howell, MI
RV-10: #41686 Under Construction
RV-9A: #90949 Under Construction
RV-10: #40637 Completed/Sold 2016
Cozy MKIV:#656 Completed/Sold 2007
"Donor Exempt" but donated through Dec. 2020
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08-08-2014, 08:17 PM
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Join Date: Nov 2010
Location: West Linn, Oregon
Posts: 1,351
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Just to follow up, after increasing the breakout force on the belleville washers (post greasing), my shimmy is now completely gone. I did not install the main gear stiffners or anything else. So I suspect my problem this whole time was just from the breakout being lowered after greasing.
The plans really should indicate that the setting should be made AFTER greasing the joint.
__________________
CharlieWaffles - But you can call me " Mark"
RV-10
N928MT
Flying - AKA Still Tinkering
Build Project Site
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08-08-2014, 08:22 PM
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Join Date: May 2005
Location: X35 - Ocala, FL
Posts: 3,679
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It will likely need to be tightened again, at least once. You may also need to add spacers under the hat on the top of the nose gear shock strut.
__________________
Jesse Saint
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03-27-2016, 02:31 PM
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Join Date: Aug 2005
Posts: 97
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As a result of reading previous threads, and the classic 15-30kt shimmy on my -10 that is otherwise ready to fly, I checked the torque of the gear leg socket bolt. Right at spec, BUT, I could turn the bolt head with the nut turning right along with it. The stock bolts with plans called for 1 washer plus nut was allowing the nut to bottom on the threads. Installed an additional washer and retorqued. Substantial reduction in shimmy now. I wonder how many -10s do not have adequate torque on that bolt because the nut is just barely bottoming before torque is achieved. It looked like it was fine with torque wrench, until I noticed the bolt wasn't squeezing and could be turned. I also checked the bolt for overall and grip length and it was on spec.
__________________
Kelly McMullen
A&P/IA
EAA Tech Counselor
KCHD
RV-10 40866
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