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Gearbox wear

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corbob13

Joined: 02 Apr 2008
Posts: 18
Location: Pulaski, WI

Posted: Mon Sep 29, 2008 4:42 pm Post subject: Gearbox wear

Guys (especially Dave),

My plane's in for annual and my A&P is hesitating to sing the book because of an issue with the gearbox.  When he drained the lube he noticed a lot of very fine metal particles in it.  He's also worried about the amount of backlash in the gears.  I thought the backlash was a little much but since I've only got  a few hours on my engine from an overhaul I've ignored it.  He compared the amount of backlash to other planes on the field with similar setups and found the others to have little to no backlash in the gear sets.



I spoke to LEAF, who did the overhaul, and they said it was normal, both the metal and the backlash.  I asked at what level the backlash should be a concern, but they said there was no limit.



What kind of experiences have other had with their gearboxes?  Do you see any amount of metal particles in the gear oil?  How about backlash?  I have a 582 model 90 with a "B" box.

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_________________
Cory

N903DB
Kitfox Model II, Rotax 582

paul(at)eucleides.com
Guest

Posted: Mon Sep 29, 2008 7:04 pm Post subject: Gearbox wear

On Mon, September 29, 2008 5:42 pm, corbob13 wrote:

 	  Quote: 	
		   



 Guys (especially Dave),

 My plane's in for annual and my A&P is hesitating to sing the book because of an issue

 with the gearbox.  When he drained the lube he noticed a lot of very fine metal

 particles in it.  He's also worried about the amount of backlash in the gears.  I

 thought the backlash was a little much but since I've only got  a few hours on my

 engine from an overhaul I've ignored it.  He compared the amount of backlash to other

 planes on the field with similar setups and found the others to have little to no

 backlash in the gear sets.



 I spoke to LEAF, who did the overhaul, and they said it was normal, both the metal and

 the backlash.  I asked at what level the backlash should be a concern, but they said

 there was no limit.


	


Visible metal would sure concern me. Here's a suggestion. Phone

Green Sky Adventures, Inc. of North Central Florida

  Toll free 888 887-5625 Cell 352 318-5625 or Email gsastaff(at)orwell.net



-- 

Paul A. Franz, P.E.

PAF Consulting Engineers

Office 425.440.9505

Cell 425.241.1618

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Guy Buchanan

Joined: 16 Jul 2006
Posts: 1204
Location: Ramona, CA

Posted: Mon Sep 29, 2008 10:11 pm Post subject: Gearbox wear

At 05:42 PM 9/29/2008, you wrote:

 	  Quote: 	
		  What kind of experiences have other had with their gearboxes?  Do 

you see any amount of metal particles in the gear oil?  How about 

backlash?  I have a 582 model 90 with a "B" box.


	


Cory,

         Backlash and metal in the oil go together. That's a bad 

sign. You may be chewing your gears. I'd pull it apart since it's 

almost trivial to do so. I notice, however, that the B has a spring 

actuated dog system between the drive gear and prop hub, so I can 

understand LEAFs telling you that metal particulate was normal. It 

may be that it's the dog that's worn and causing the backlash, and 

not the gear, or the spring has failed or is otherwise not providing 

sufficient pressure.

         How many hours total on the gearbox? I doubt LEAF did 

anything at all to the gearbox during the rebuild, so you're probably 

operating on the original time.

Guy Buchanan

San Diego, CA

K-IV 1200 / 582-C / Warp / 100% done, thanks mostly to Bob Ducar.

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_________________
Guy Buchanan
Deceased K-IV 1200
A glider pilot too.

msm_9949(at)yahoo.com
Guest

Posted: Tue Sep 30, 2008 6:27 am Post subject: Gearbox wear

Hi Cory.

  

 I have the 3:1 C-Box. Only issue I've had was "slippage" which produced a really scary over-rev condition. Fortunately, this was on the ground while doing a break-in run-up. Turns out there was a service bulletin on that so the box came off and went to LEAF for repair/upgrade. No problems since, either with backlash or making metal.

  

 Marco Menezes N99KX

 Kitfox 2 582-90 C-Box 3:1



--- On Mon, 9/29/08, corbob13 <corbob13(at)netnet.net> wrote:



  	  Quote: 	
		  From: corbob13 <corbob13(at)netnet.net>

Subject: Gearbox wear

To: kitfox-list(at)matronics.com

Date: Monday, September 29, 2008, 8:42 PM



 	  Quote: 	
		  --> Kitfox-List message posted by: "corbob13"

<corbob13(at)netnet.net>



Guys (especially Dave),

My plane's in for annual and my A&P is hesitating to sing the book

because of an issue with the gearbox.  When he drained the lube he noticed a lot

of very fine metal particles in it.  He's also worried about the amount of

backlash in the gears.  I thought the backlash was a little much but since

I've only got  a few hours on my engine from an overhaul I've ignored

it.  He compared the amount of backlash to other planes on the field with

similar setups and found the others to have little to no backlash in the gear

sets.



I spoke to LEAF, who did the overhaul, and they said it was normal, both the

metal and the backlash.  I asked at what level the backlash should be a concern,

but they said there was no limit.



What kind of experiences have other had with their gearboxes?  Do you see any

amount of metal particles in the gear oil?  How about backlash?  I have a 582

model 90 with a "B" box.



--------

Cory



N903DB

Kitfox Model II, Rotax 582





Read this topic online here:



http://forums.matronics.com/viewtopic.php?p 6841#206841





	
	


         [quote][b]

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