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cjpilot710(at)aol.com
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 Posted: Fri Dec 11, 2009 7:43 am Post subject: CJ nose strut "clunking" |
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In a message dated 12/11/2009 10:10:38 A.M. Eastern Standard Time, keith.mckinley(at)townisp.com writes:
Keith,
Nope it's not normal to hear a clunk. And I think you're correct in needing to totally service that strut (air and fluid). To much pressure in the strut will cause the piston to bottom out (extend) into the enter V collar that centers the wheel when the strut is fully extended. To much pressure and you will not be able to get the nose gear to caster for turning.
If the hyd and air pressure are correct, you shouldn't hear anything normally. You may hear it occasionally taxing over rough ground.
Jim "Pappy" Goolsby
| Quote: | --> Yak-List message posted by: "keithmckinley" <keith.mckinley(at)townisp.com>
Quick question for you all before I start undoing things. From day one my airplane has had a noticeable "clunk" in the nose strut while taxing. Even at slow speeds, every time I hit even a small crack or bump in the pavement I get it
This only happens on the upstroke or when the strut fully extends. I tried reducing the air pressure in the strut thinking it might be over serviced but that made the strut VERY mushy and actually made the airplane very hard to steer. At this point the pressure is correctly set.
My gut feeling is that the hyd fluid is both old, watery and probably less than the required quantity. I believe the strut should work almost the same on compression and extension, just like a normal shock absorber on a car. Certainly the clunk I hear when it over extends can't be good for the stut.
So before I drain everything and try to service it, is this normal? If not, any advice you guys may have for fixing this problem and/or servicing the strut would be appreciated.
Keith
--------
Keith McKinley
700HS
KFIT
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dougsappllc(at)gmail.com
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| Posted: Fri Dec 11, 2009 7:44 am Post subject: CJ nose strut "clunking" |
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Keith,Check:
- Proper adjustment of the over center stay on the nose gear linkage. The "clunking" may be it comming in and out of the over center position.-----not good.
- The bearing on the TOP end of your nose gear actuator. Many of the "end lugs" were not properly heat treated and are very soft. In time the hole in which the bearing is pressed will elongate allowing the bearing to move "clunk" up and down. We have a US manufactured 4140 steel end lug with new bearing in stock to solve this problem.
I doubt your problem has anything to do with OVER extension of the oleo/fork in the nose gear. It might clunk if it were grossly UNDER pressured, but not OVER pressured.
Always yakin,
Doug
On Fri, Dec 11, 2009 at 7:08 AM, keithmckinley <keith.mckinley(at)townisp.com (keith.mckinley(at)townisp.com)> wrote:
| Quote: | --> Yak-List message posted by: "keithmckinley" <keith.mckinley(at)townisp.com (keith.mckinley(at)townisp.com)>
Quick question for you all before I start undoing things. From day one my airplane has had a noticeable "clunk" in the nose strut while taxing. Even at slow speeds, every time I hit even a small crack or bump in the pavement I get it
This only happens on the upstroke or when the strut fully extends. I tried reducing the air pressure in the strut thinking it might be over serviced but that made the strut VERY mushy and actually made the airplane very hard to steer. At this point the pressure is correctly set.
My gut feeling is that the hyd fluid is both old, watery and probably less than the required quantity. I believe the strut should work almost the same on compression and extension, just like a normal shock absorber on a car. Certainly the clunk I hear when it over extends can't be good for the stut.
So before I drain everything and try to service it, is this normal? If not, any advice you guys may have for fixing this problem and/or servicing the strut would be appreciated.
Keith
--------
Keith McKinley
700HS
KFIT
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