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Nose Wheel Shimmy

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quinn_tom(at)tqiinc.com
Guest

Posted: Wed Sep 29, 2010 2:46 am Post subject: Nose Wheel Shimmy

I’m having nose wheel shimmy issues upon landing. It isn’t a problem during taxi or take off. The nose tire is less than a year old. Any advice on how to fix this? Thanks!  

   

   

Tom Quinn  

249RR  

       [quote][b]

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flyadive(at)gmail.com
Guest

Posted: Wed Sep 29, 2010 4:13 am Post subject: Nose Wheel Shimmy

Tom:



It is not the age of your tire (more than likely)... It is two items:

1 - The torque on the nose fork - The manual says something like 20 Lbs but I find it needs to be about 30 to 35 Lbs.

 2 - The torque on the axle - The torque should be tight enough to ONLY allow the tire to revolve 1/2 to 1 turn when done by hand with moderate strength.

Pull out the manual and check out the procedures.  ALSO when was the last time the nose fork was off for greasing?  I'd bet not in quite a while.

 



Barry

"Chop'd Liver"

On Wed, Sep 29, 2010 at 6:44 AM, Tom Quinn <quinn_tom(at)tqiinc.com (quinn_tom(at)tqiinc.com)> wrote:

 [quote]             

I’m having nose wheel shimmy issues upon landing. It isn’t a problem during taxi or take off. The nose tire is less than a year old. Any advice on how to fix this? Thanks!  

   

   

Tom Quinn  

249RR  

        	  Quote: 	
		  



st" target="_blank">http://www.matronics.com/Navigator?TeamGrumman-List

tp://forums.matronics.com

_blank">http://www.matronics.com/contribution



	


[b]

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aviation(at)acs-group.net
Guest

Posted: Wed Sep 29, 2010 4:15 am Post subject: Nose Wheel Shimmy

Jack the nose and Use a fish scale, tie it to the center of the wheel  and and measure the amount of pull it take to move the nose wheel. I keep mine up around 20 lbs. Books says 12 or 16. Others may have more official words. If it is way too loose you can try turning the nut one notch at a time until it is tight enough. Have you ever taken nose wheel assembly off and inspected and cleaned it, and regreased it The belville washer setup is very important so make sure you pay attention when you take it apart.  It is supposed to be removed every X and cleaned and regreased.  Some do it every annual. I do it every other year.



This may not fix it but it will shimmy if it is too loose and it is easy to check. 



On Wed, Sep 29, 2010 at 5:44 AM, Tom Quinn <quinn_tom(at)tqiinc.com (quinn_tom(at)tqiinc.com)> wrote:

 [quote]             

I’m having nose wheel shimmy issues upon landing. It isn’t a problem during taxi or take off. The nose tire is less than a year old. Any advice on how to fix this? Thanks!  

   

   

Tom Quinn  

249RR  

        	  Quote: 	
		  



st" target="_blank">http://www.matronics.com/Navigator?TeamGrumman-List

tp://forums.matronics.com

_blank">http://www.matronics.com/contribution



	


[b]

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aviation(at)acs-group.net
Guest

Posted: Wed Sep 29, 2010 4:27 am Post subject: Nose Wheel Shimmy

I think Barry's info is more correct. That nose fork has to be so tight that it is scary but it works. My AP gets it right by feel but use a scale to be sure. . Def above what the book says. 



 On Wed, Sep 29, 2010 at 7:10 AM, FLYaDIVE <flyadive(at)gmail.com (flyadive(at)gmail.com)> wrote:

[quote] Tom:



It is not the age of your tire (more than likely)... It is two items:

1 - The torque on the nose fork - The manual says something like 20 Lbs but I find it needs to be about 30 to 35 Lbs.

  2 - The torque on the axle - The torque should be tight enough to ONLY allow the tire to revolve 1/2 to 1 turn when done by hand with moderate strength.

Pull out the manual and check out the procedures.  ALSO when was the last time the nose fork was off for greasing?  I'd bet not in quite a while.

  



Barry

"Chop'd Liver"

On Wed, Sep 29, 2010 at 6:44 AM, Tom Quinn <quinn_tom(at)tqiinc.com (quinn_tom(at)tqiinc.com)> wrote:

  

 	  Quote: 	
		               

I’m having nose wheel shimmy issues upon landing. It isn’t a problem during taxi or take off. The nose tire is less than a year old. Any advice on how to fix this? Thanks!  

   

   

Tom Quinn  

249RR  

       

 	  Quote: 	
		  



st" target="_blank">http://www.matronics.com/Navigator?TeamGrumman-List

tp://forums.matronics.com

_blank">http://www.matronics.com/contribution



	


	




   	  Quote: 	
		  



st" target="_blank">http://www.matronics.com/Navigator?TeamGrumman-List

tp://forums.matronics.com

_blank">http://www.matronics.com/contribution



	




[b]

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quinn_tom(at)tqiinc.com
Guest

Posted: Wed Sep 29, 2010 5:01 am Post subject: Nose Wheel Shimmy

Thanks for the insight, I’m due for an annual soon and will pass this onto the AP. Thanks!  

   

Tom Quinn  

Tiger 249RR  

     

From: owner-teamgrumman-list-server(at)matronics.com [mailto:owner-teamgrumman-list-server(at)matronics.com] On Behalf Of Walt Beaulieu

 Sent: Wednesday, September 29, 2010 8:19 AM

 To: teamgrumman-list(at)matronics.com

 Subject: Re: Nose Wheel Shimmy  

  

   

I think Barry's info is more correct. That nose fork has to be so tight that it is scary but it works. My AP gets it right by feel but use a scale to be sure. . Def above what the book says.     

On Wed, Sep 29, 2010 at 7:10 AM, FLYaDIVE <flyadive(at)gmail.com (flyadive(at)gmail.com)> wrote:  

Tom:    

   

    

It is not the age of your tire (more than likely)... It is two items:  

    

1 - The torque on the nose fork - The manual says something like 20 Lbs but I find it needs to be about 30 to 35 Lbs.  

    

2 - The torque on the axle - The torque should be tight enough to ONLY allow the tire to revolve 1/2 to 1 turn when done by hand with moderate strength.  

    

   

    

Pull out the manual and check out the procedures.  ALSO when was the last time the nose fork was off for greasing?  I'd bet not in quite a while.  

    

   

    

Barry  

    

"Chop'd Liver"  

    

       

On Wed, Sep 29, 2010 at 6:44 AM, Tom Quinn <quinn_tom(at)tqiinc.com (quinn_tom(at)tqiinc.com)> wrote:  

   	  Quote: 	
		          

I’m having nose wheel shimmy issues upon landing. It isn’t a problem during taxi or take off. The nose tire is less than a year old. Any advice on how to fix this? Thanks!  

   

   

Tom Quinn  

249RR  

  

   	  Quote: 	
		    st" target="_blank">http://www.matronics.com/Navigator?TeamGrumman-Listtp://forums.matronics.com_blank">http://www.matronics.com/contribution 	


  	
  

  

   

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       [quote][b]

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bob.hodo(at)YAHOO.COM
Guest

Posted: Wed Sep 29, 2010 7:10 am Post subject: Nose Wheel Shimmy

The belleville washers are critical, and every owner needs to understand their design and purpose.  They are also called disc springs.



They are made of steel, (ours are not stainless, but they could have been) and are cup shaped.  They will stack nicely like spoons, but this doubles their resistance to flex which was their purpose.  



Most spring steel falls into the rockwell hardness testing between RC43 and RC47, about like a knife backspring.



There has been much discussion about the stacking order in the nose fork, and IIRC there are at least some of the maintenance manuals that got it wrong.



I think sometimes there are 3, and sometimes there are 4 of them, but they must meet lip to lip or bottom to bottom when contacting each other.  They also must meet a flat washer that is hardened or they will merely form  the flat washer to their own shape and spring flex will be lost.



Get the stacking order correct.  Make sure every part is in good condition or call Garner.  Tension tighter than book spec.  Tension drops with wear, so recheck at EVERY annual, clean and re-grease the entire contact area.



Bob Hodo 	  Quote: 	
		  	




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teamgrumman(at)YAHOO.COM
Guest

Posted: Wed Sep 29, 2010 9:38 am Post subject: Nose Wheel Shimmy

Odds are, it isn't the tire.  Tighten the castled nut on the nose strut a half turn or so and then retry.  





. . . .  well, that's assuming it's put together correctly.  A rough estimate is 80% of the planes I get (new to me) have the hardware installed wrong.



From: Tom Quinn <quinn_tom(at)tqiinc.com>

To: teamgrumman-list(at)matronics.com

Sent: Wed, September 29, 2010 3:44:25  AM

Subject: TeamGrumman-List: Nose Wheel Shimmy



                  

Iâ€™m having nose wheel shimmy issues upon landing. It isnâ€™t a problem during taxi or take off. The nose tire is less than a year old. Any advice on how to fix this? Thanks!   

     

     

Tom Quinn   

249RR   

        	  Quote: 	
		  http://www.matronics.colank" href="http://forums.matronics.com">http://forums.matronics.com target="_blank" href="http://www.matronics.com/contribution">http://ww=======================


	


   



         [quote][b]

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flyv35b(at)minetfiber.com
Guest

Posted: Wed Sep 29, 2010 11:47 am Post subject: Nose Wheel Shimmy

The manual says 10-22 lb.  I've found that  setting it around 20 lb will not result in any shimmy if the tire pressure is  correct and the fork is adjusted and lubed properly.  No excess drag from  the O-ring and not shimmed properly.  30-35 lb is to much and will require  much more brake to effect steering, wearing out the brake linings  quicker.

  

 Cliff

 [quote]   ---

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flyadive(at)gmail.com
Guest

Posted: Wed Sep 29, 2010 12:57 pm Post subject: Nose Wheel Shimmy

Good point Cliff.



The number is a guestamate and not very exact. 

It is compared to lifting my portable took box  

I'll rig up something to verify the number.

 



Barry



On Wed, Sep 29, 2010 at 3:44 PM, flyv35b <flyv35b(at)minetfiber.com (flyv35b(at)minetfiber.com)> wrote:

[quote]        The manual says 10-22 lb.  I've found that  setting it around 20 lb will not result in any shimmy if the tire pressure is  correct and the fork is adjusted and lubed properly.  No excess drag from  the O-ring and not shimmed properly.  30-35 lb is to much and will require  much more brake to effect steering, wearing out the brake linings  quicker.

  

 Cliff

 [quote]   ---

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