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YAK 50 tail Wheel jack Cylinder

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yakxx21

Joined: 10 Jun 2012
Posts: 22

Posted: Tue Jun 12, 2012 2:28 am Post subject: YAK 50 tail Wheel jack Cylinder

Help !   My Tail wheel suspension Jack (Cylinder) slowly goes down. I have stripped and cleaned  it and found quite a lot of oil inside . Is that correct ?



Where can I get a rebuild SEAL kit from ? 



Must be Nitrogen or can I use AIR ?



 I have pumped it up and put it in water but cannot see any bubbles leaking..very odd



Any help advise , much appreciated especially as to where I can get a rebuild kit from



Thanks

viperdoc(at)mindspring.co
Guest

Posted: Tue Jun 12, 2012 5:03 am Post subject: YAK 50 tail Wheel jack Cylinder

Sorry...dry air works in a pinch but I prefer Nitrogen.

Doc



Sent from my iPad



On Jun 12, 2012, at 5:28 AM, "yakxx21" <ken(at)aeroalgarve.com> wrote:



 	  Quote: 	
		   

 

 Help !   My Tail wheel suspension Jack (Cylinder) slowly goes down. I have stripped and cleaned  it and found quite a lot of oil inside . Is that correct ?

 

 Where can I get a rebuild SEAL kit from ? 

 

 Must be Nitrogen or can I use AIR ?

 

 I have pumped it up and put it in water but cannot see any bubbles leaking..very odd

 

 Any help advise , much appreciated especially as to where I can get a rebuild kit from

 

 Thanks

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=375367#375367

viperdoc(at)mindspring.co
Guest

Posted: Tue Jun 12, 2012 5:17 am Post subject: YAK 50 tail Wheel jack Cylinder

Try West London Aero Club. They have bushing and spring kit that restores the functionality of the strut. I am not aware of a seal kit for the unit not saying one could not be fabricated if there was enough demand. 

Doc



Sent from my iPad



On Jun 12, 2012, at 5:28 AM, "yakxx21" <ken(at)aeroalgarve.com> wrote:



 	  Quote: 	
		   

 

 Help !   My Tail wheel suspension Jack (Cylinder) slowly goes down. I have stripped and cleaned  it and found quite a lot of oil inside . Is that correct ?

 

 Where can I get a rebuild SEAL kit from ? 

 

 Must be Nitrogen or can I use AIR ?

 

 I have pumped it up and put it in water but cannot see any bubbles leaking..very odd

 

 Any help advise , much appreciated especially as to where I can get a rebuild kit from

 

 Thanks

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=375367#375367

Jetj01(at)aol.com
Guest

Posted: Tue Jun 12, 2012 6:27 am Post subject: YAK 50 tail Wheel jack Cylinder

I just found a local hydraulic cylinder repair shop in town and brought in my tail wheel strut seals and found a match from their bench stock.  I used ordinary air when I refilled it.  That was 2007 and it has been working normally since.  I think total cost was $5.  Jj

Sent from my iPhone

On Jun 12, 2012, at 7:57 AM, "Roger Kemp M.D." <viperdoc(at)mindspring.com> wrote:

 	  Quote: 	

 Try West London Aero Club. They have bushing and spring kit that restores the functionality of the strut. I am not aware of a seal kit for the unit not saying one could not be fabricated if there was enough demand. 

 Doc

 Sent from my iPad

 On Jun 12, 2012, at 5:28 AM, "yakxx21" <ken(at)aeroalgarve.com> wrote:

> 

> 

> Help !   My Tail wheel suspension Jack (Cylinder) slowly goes down. I have stripped and cleaned  it and found quite a lot of oil inside . Is that correct ?

> 

> Where can I get a rebuild SEAL kit from ? 

> 

> Must be Nitrogen or can I use AIR ?

> 

> I have pumped it up and put it in water but cannot see any bubbles leaking..very odd

> 

> Any help advise , much appreciated especially as to where I can get a rebuild kit from

> 

> Thanks

> 

> 

> 

> 

> Read this topic online here:

> 

> http://forums.matronics.com/viewtopic.php?p=375367#375367

> 

> 

> 

> 

> 

> 

> 

> 

> 

>

viperdoc(at)mindspring.co
Guest

Posted: Tue Jun 12, 2012 6:41 am Post subject: YAK 50 tail Wheel jack Cylinder

Ingenious. Shoulda, coulda, and wish I woulda thought of that!

Doc



Sent from my iPad



On Jun 12, 2012, at 9:24 AM, Jj <Jetj01(at)aol.com> wrote:



 	  Quote: 	
		   

 

 I just found a local hydraulic cylinder repair shop in town and brought in my tail wheel strut seals and found a match from their bench stock.  I used ordinary air when I refilled it.  That was 2007 and it has been working normally since.  I think total cost was $5.  Jj

 

 Sent from my iPhone

 

 On Jun 12, 2012, at 7:57 AM, "Roger Kemp M.D." <viperdoc(at)mindspring.com> wrote:

 

> 

> 

> Try West London Aero Club. They have bushing and spring kit that restores the functionality of the strut. I am not aware of a seal kit for the unit not saying one could not be fabricated if there was enough demand. 

> Doc

> 

> Sent from my iPad

> 

> On Jun 12, 2012, at 5:28 AM, "yakxx21" <ken(at)aeroalgarve.com> wrote:

> 

>> 

>> 

>> Help !   My Tail wheel suspension Jack (Cylinder) slowly goes down. I have stripped and cleaned  it and found quite a lot of oil inside . Is that correct ?

>> 

>> Where can I get a rebuild SEAL kit from ? 

>> 

>> Must be Nitrogen or can I use AIR ?

>> 

>> I have pumped it up and put it in water but cannot see any bubbles leaking..very odd

>> 

>> Any help advise , much appreciated especially as to where I can get a rebuild kit from

>> 

>> Thanks

>> 

>> 

>> 

>> 

>> Read this topic online here:

>> 

>> http://forums.matronics.com/viewtopic.php?p=375367#375367

>> 

>> 

>> 

>> 

>> 

>> 

>> 

>> 

>> 

>> 

> 

> 

> 

> 

>

yakxx21

Joined: 10 Jun 2012
Posts: 22

Posted: Tue Jun 12, 2012 7:25 am Post subject: Re: YAK 50 tail Wheel jack Cylinder

Thanks and all very useful  ..but I would like to hear more about the  replacement parts found in the local  hydraulic shop...is there any reference  ie    were they from some sor of truck or car jack or what ??



Thanks

Jetj01(at)aol.com
Guest

Posted: Tue Jun 12, 2012 8:09 am Post subject: YAK 50 tail Wheel jack Cylinder

I didn't...some hay tosser in KS did, just repeated procedure . Jj



Sent from my iPhone



On Jun 12, 2012, at 9:38 AM, "Roger Kemp M.D." <viperdoc(at)mindspring.com> wrote:



 	  Quote: 	
		   

 

 Ingenious. Shoulda, coulda, and wish I woulda thought of that!

 Doc

 

 Sent from my iPad

 

 On Jun 12, 2012, at 9:24 AM, Jj <Jetj01(at)aol.com> wrote:

 

> 

> 

> I just found a local hydraulic cylinder repair shop in town and brought in my tail wheel strut seals and found a match from their bench stock.  I used ordinary air when I refilled it.  That was 2007 and it has been working normally since.  I think total cost was $5.  Jj

> 

> Sent from my iPhone

> 

> On Jun 12, 2012, at 7:57 AM, "Roger Kemp M.D." <viperdoc(at)mindspring.com> wrote:

> 

>> 

>> 

>> Try West London Aero Club. They have bushing and spring kit that restores the functionality of the strut. I am not aware of a seal kit for the unit not saying one could not be fabricated if there was enough demand. 

>> Doc

>> 

>> Sent from my iPad

>> 

>> On Jun 12, 2012, at 5:28 AM, "yakxx21" <ken(at)aeroalgarve.com> wrote:

>> 

>>> 

>>> 

>>> Help !   My Tail wheel suspension Jack (Cylinder) slowly goes down. I have stripped and cleaned  it and found quite a lot of oil inside . Is that correct ?

>>> 

>>> Where can I get a rebuild SEAL kit from ? 

>>> 

>>> Must be Nitrogen or can I use AIR ?

>>> 

>>> I have pumped it up and put it in water but cannot see any bubbles leaking..very odd

>>> 

>>> Any help advise , much appreciated especially as to where I can get a rebuild kit from

>>> 

>>> Thanks

>>> 

>>> 

>>> 

>>> 

>>> Read this topic online here:

>>> 

>>> http://forums.matronics.com/viewtopic.php?p=375367#375367

>>> 

>>> 

>>> 

>>> 

>>> 

>>> 

>>> 

>>> 

>>> 

>>> 

>> 

>> 

>> 

>> 

>> 

> 

> 

> 

> 

>

Jetj01(at)aol.com
Guest

Posted: Tue Jun 12, 2012 8:14 am Post subject: YAK 50 tail Wheel jack Cylinder

The hydraulic cylinder repair shop literally brought out a box full of seals and him and I just rummaged through them until I found one that looked and felt the same.  Not scientific I realize or official YAK part or near enough $$$ but it's the way I roll and again, trouble free now 5 years.  Jj



Sent from my iPhone



On Jun 12, 2012, at 10:25 AM, "yakxx21" <ken(at)aeroalgarve.com> wrote:



 	  Quote: 	
		   

 

 Thanks and all very useful  ..but I would like to hear more about the  replacement parts found in the local  hydraulic shop...is there any reference  ie    were they from some sor of truck or car jack or what ??

 

 Thanks

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=375404#375404

viperdoc(at)mindspring.co
Guest

Posted: Tue Jun 12, 2012 8:55 am Post subject: YAK 50 tail Wheel jack Cylinder

Amazing what that dude comes up with! :^)) Saved me on converting /timing that M-14DH to a PF!

Doc

--

mark.bitterlich(at)navy.m
Guest

Posted: Tue Jun 12, 2012 1:35 pm Post subject: YAK 50 tail Wheel jack Cylinder

While we are talking about this tail wheel oleo .....   My seals leak a bit as well. Not real fast, but they leak.  The idea of using seal replacements from the local hydraulic repair shop is a cool idea, but ... also too..... 



One thing I have found is that in some cases you do not need an adapter that screws down onto the fill valve and pushes down on the Schrader like fitting when filling the tailwheel oleo.  If the air pressure is high enough, it just "goes in anyway".  



So, after the oleo is all fixed with new seals, you could simply attach a FLEXIBLE hose to the fill fitting, and then have a Schrader valve on the other end mounted into (on to?)  the access panel.  Kind of like what is being done now (more or less) on the actual aircraft external air fill port.  



One just puts a hose on there, pumps in some pressure and Voila ... the oleo is now re-pressurized.  



Instead of: 



Taking out all the screws. 

Removing the panel. 

Taking off the fill port cap on the oleo. 

Screwing on the special fill tool. 

Screwing down the fill tool Schrader valve "opener"

Applying air pressure, filling oleo.  

Reverse all this and then put it all back together.  



Just an idea.  Never tried it. (You listening Jan?    



Mark





--

viperdoc(at)mindspring.co
Guest

Posted: Tue Jun 12, 2012 5:02 pm Post subject: YAK 50 tail Wheel jack Cylinder

The 52 TD does exactly that.

Doc



Sent from my iPad



On Jun 12, 2012, at 4:28 PM, "Bitterlich, Mark G CIV Det Cherry Point, MALS-14 64E" <mark.bitterlich(at)navy.mil> wrote:



[quote] 

 

 While we are talking about this tail wheel oleo .....   My seals leak a bit as well. Not real fast, but they leak.  The idea of using seal replacements from the local hydraulic repair shop is a cool idea, but ... also too..... 

 

 One thing I have found is that in some cases you do not need an adapter that screws down onto the fill valve and pushes down on the Schrader like fitting when filling the tailwheel oleo.  If the air pressure is high enough, it just "goes in anyway".  

 

 So, after the oleo is all fixed with new seals, you could simply attach a FLEXIBLE hose to the fill fitting, and then have a Schrader valve on the other end mounted into (on to?)  the access panel.  Kind of like what is being done now (more or less) on the actual aircraft external air fill port.  

 

 One just puts a hose on there, pumps in some pressure and Voila ... the oleo is now re-pressurized.  

 

 Instead of: 

 

 Taking out all the screws. 

 Removing the panel. 

 Taking off the fill port cap on the oleo. 

 Screwing on the special fill tool. 

 Screwing down the fill tool Schrader valve "opener"

 Applying air pressure, filling oleo.  

 Reverse all this and then put it all back together.  

 

 Just an idea.  Never tried it. (You listening Jan?    

 

 Mark

 

 

 

 

 --

KingCJ6(at)aol.com
Guest

Posted: Tue Jun 12, 2012 5:15 pm Post subject: YAK 50 tail Wheel jack Cylinder

I donâ€™t know if Yaks are the same,  but on our CJ, we removed the valve in the Schrader fitting on our external fill  port 15 years ago (someone thought it would turn into a lethal projectile if it  blew out).  A one-way, internal high  pressure valve prevents air from escaping.   YRMV. 

  

Dave

  

  In a message dated 6/12/2012 2:35:32 P.M. Pacific Daylight Time,  mark.bitterlich(at)navy.mil writes:

 [quote]-->    Yak-List message posted by: "Bitterlich, Mark G CIV Det Cherry Point, MALS-14    64E" <mark.bitterlich(at)navy.mil>



While we are talking about this    tail wheel oleo .....   My seals leak a bit as well. Not real fast,    but they leak.  The idea of using seal replacements from the local    hydraulic repair shop is a cool idea, but ... also too..... 



One thing    I have found is that in some cases you do not need an adapter that screws down    onto the fill valve and pushes down on the Schrader like fitting when filling    the tailwheel oleo.  If the air pressure is high enough, it just "goes in    anyway".  



So, after the oleo is all fixed with new seals, you    could simply attach a FLEXIBLE hose to the fill fitting, and then have a    Schrader valve on the other end mounted into (on to?)  the access    panel.  Kind of like what is being done now (more or less) on the actual    aircraft external air fill port.  



One just puts a hose on there,    pumps in some pressure and Voila ... the oleo is now re-pressurized.     



Instead of: 



Taking out all the screws. 

Removing the panel.    

Taking off the fill port cap on the oleo. 

Screwing on the special fill    tool. 

Screwing down the fill tool Schrader valve "opener"

Applying air    pressure, filling oleo.  

Reverse all this and then put it all back    together.  



Just an idea.  Never tried it. (You listening    Jan?    



Mark





-----Original    Message-----

From: owner-yak-list-server(at)matronics.com    [mailto:owner-yak-list-server(at)matronics.com] On Behalf Of Roger Kemp

Sent:    Tuesday, June 12, 2012 12:53 PM

To: yak-list(at)matronics.com

Subject: Re:    YAK 50 tail Wheel jack Cylinder



--> Yak-List message    posted by: Roger Kemp <viperdoc(at)mindspring.com>



Amazing what that    dude comes up with! :^)) Saved me on converting /timing that M-14DH to a    PF!

Doc

--

brian(at)lloyd.com
Guest

Posted: Tue Jun 12, 2012 6:41 pm Post subject: YAK 50 tail Wheel jack Cylinder

On Tue, Jun 12, 2012 at 5:57 PM, Roger Kemp M.D. <viperdoc(at)mindspring.com (viperdoc(at)mindspring.com)> wrote:

 	  Quote: 	
		   --> Yak-List message posted by: "Roger Kemp M.D." <viperdoc(at)mindspring.com (viperdoc(at)mindspring.com)>

 

 The 52 TD does exactly that.

 Doc

	




Just remember, if you are using pressure to open the Schrader valve, it will function as a pressure reducing valve. If it requires 150 psi to open, then the pressure on the downstream side of the valve will be 150 psi less than on the upstream side of the valve. If you need 1000 psi in the oleo and you use 1000 psi nitrogen without using something to mechanically open the Schrader valve, the pressure in the oleo will be 850 psi.

 

-- 

Brian Lloyd, WB6RQN/J79BPL

3191 Western Dr.

Cameron Park, CA 95682

brian(at)lloyd.com (brian(at)lloyd.com)

+1.767.617.1365 (Dominica)

+1.916.877.5067 (USA)

 

  [quote][b]

jan.mevis(at)informavia.b
Guest

Posted: Tue Jun 12, 2012 10:26 pm Post subject: YAK 50 tail Wheel jack Cylinder

Mark is absolutely correct: reservicing without a schrader valve works

well. I've done it several times.

About the seals: indeed it is possible to find replacements in an ordinary

shop. A friend with a Yak 50 had the seals in the tailwheel oleo replaced

by X-shaped quad rings from such a shop.

But he also had the cylinder honed because there was some corrosion. Since

then (several years) he had no problem anymore.

I tried the solution with the spring replacement a few years ago. But

IMHO, this is too hard: it hammers too hard, the spring inside the oleo,

so you risk hammering the rivets loose.

So I went back to the oleo with nitrogen.

But occasionally I have to fill with nitrogen. So next time, I'll replace

the seals with quad rings.



Jan



On 13/06/12 02:57, "Roger Kemp M.D." <viperdoc(at)mindspring.com> wrote:



[quote]

<viperdoc(at)mindspring.com>



The 52 TD does exactly that.

Doc



Sent from my iPad



On Jun 12, 2012, at 4:28 PM, "Bitterlich, Mark G CIV Det Cherry Point,

MALS-14 64E" <mark.bitterlich(at)navy.mil> wrote:



> 

>Point, MALS-14 64E" <mark.bitterlich(at)navy.mil>

> 

> While we are talking about this tail wheel oleo .....   My seals leak a

>bit as well. Not real fast, but they leak.  The idea of using seal

>replacements from the local hydraulic repair shop is a cool idea, but

>... also too.....

> 

> One thing I have found is that in some cases you do not need an adapter

>that screws down onto the fill valve and pushes down on the Schrader

>like fitting when filling the tailwheel oleo.  If the air pressure is

>high enough, it just "goes in anyway".

> 

> So, after the oleo is all fixed with new seals, you could simply attach

>a FLEXIBLE hose to the fill fitting, and then have a Schrader valve on

>the other end mounted into (on to?)  the access panel.  Kind of like

>what is being done now (more or less) on the actual aircraft external

>air fill port.  

> 

> One just puts a hose on there, pumps in some pressure and Voila ... the

>oleo is now re-pressurized.

> 

> Instead of: 

> 

> Taking out all the screws.

> Removing the panel.

> Taking off the fill port cap on the oleo.

> Screwing on the special fill tool.

> Screwing down the fill tool Schrader valve "opener"

> Applying air pressure, filling oleo.

> Reverse all this and then put it all back together.

> 

> Just an idea.  Never tried it. (You listening Jan?  

> 

> Mark

> 

> 

> 

> 

> --

dsavarese0812(at)bellsout
Guest

Posted: Wed Jun 13, 2012 2:53 am Post subject: YAK 50 tail Wheel jack Cylinder

On Yak 52's, there is no Schrader valve fitting on the external air fill 

port unless someone installed one. If someone did install a Schrader 

valve, most definitely the valve core that comes with them should be 

removed. Even if the valve core is a high pressure valve core, it is 

unnecessary because of the check valves in the system already.

Dennis



A. Dennis Savarese

334-285-6263

334-546-8182 (mobile)

www.yak-52.com

Skype - Yakguy1

On 6/12/2012 8:11 PM, KingCJ6(at)aol.com wrote:

[quote]

 I don’t know if Yaks are the same, but on our CJ, we removed the valve 

 in the Schrader fitting on our external fill port 15 years ago 

 (someone thought it would turn into a lethal projectile if it blew 

 out).A one-way, internal high pressure valve prevents air from 

 escaping.YRMV.



 Dave



 In a message dated 6/12/2012 2:35:32 P.M. Pacific Daylight Time, 

 mark.bitterlich(at)navy.mil writes:



     

     Point, MALS-14 64E" <mark.bitterlich(at)navy.mil>



     While we are talking about this tail wheel oleo ..... My seals

     leak a bit as well. Not real fast, but they leak. The idea of

     using seal replacements from the local hydraulic repair shop is a

     cool idea, but ... also too.....



     One thing I have found is that in some cases you do not need an

     adapter that screws down onto the fill valve and pushes down on

     the Schrader like fitting when filling the tailwheel oleo. If the

     air pressure is high enough, it just "goes in anyway".



     So, after the oleo is all fixed with new seals, you could simply

     attach a FLEXIBLE hose to the fill fitting, and then have a

     Schrader valve on the other end mounted into (on to?) the access

     panel. Kind of like what is being done now (more or less) on the

     actual aircraft external air fill port.



     One just puts a hose on there, pumps in some pressure and Voila

     ... the oleo is now re-pressurized.



     Instead of:



     Taking out all the screws.

     Removing the panel.

     Taking off the fill port cap on the oleo.

     Screwing on the special fill tool.

     Screwing down the fill tool Schrader valve "opener"

     Applying air pressure, filling oleo.

     Reverse all this and then put it all back together.



     Just an idea. Never tried it. (You listening Jan? 



     Mark





     --

jill(at)m-14p.com
Guest

Posted: Wed Jun 13, 2012 7:47 am Post subject: YAK 50 tail Wheel jack Cylinder

Group,



I have the tail strut seal kit in stock.  I also stock the Yak 50 MLG

actuator seal kits.  Years ago, we manufactured a batch of stainless

tailwheel cylinders for the Yak 50.  We haven't had any calls for them

recently, but I am open to manufacturing another batch.  



Pacific Oil Cooler does a great job on oil coolers.  They also have some

good info on their website:  www.oilcoolers.com .



Jill 

M-14P, Inc.

mark.bitterlich(at)navy.m
Guest

Posted: Wed Jun 13, 2012 1:38 pm Post subject: YAK 50 tail Wheel jack Cylinder

On the YAK-50, there is a one way directional check valve that prevents backflow of high pressure air to the external fill port.  



Mark

--

mark.bitterlich(at)navy.m
Guest

Posted: Wed Jun 13, 2012 1:42 pm Post subject: YAK 50 tail Wheel jack Cylinder

Great theory, and I agree that your premise is accurate.... but it does

not seem to work like that. 



When you increase air to the YAK-50 oleo, at a certain point there is a

loud buzzing like sound as the valve cycles quickly.  I have a highly

accurate high pressure regulator connected to the input using nitrogen.

I then closed the air input to the regulator, and opened the valve

manually on the Oleo input.  This allowed the air to escape back to the

regulator pressure gage where it could be read.  It was about 50 PSI

lower than the initial regulator setting that allowed the air to flow

into the oleo to begin with.  



I have no idea why.  Interesting discussion, but for me, I was just glad

I no longer had to open and close the manual screw in valve on the

fitting that manually opens the oleo Schrader.  There is a rather large

margin for error on that oleo.... so no big deal really.  



Go figure.  



Mark

--

yakxx21

Joined: 10 Jun 2012
Posts: 22

Posted: Fri Jun 15, 2012 12:05 am Post subject: Re: YAK 50 tail Wheel jack Cylinder

 	  jill(at)m-14p.com wrote: 	
		  Group,



I have the tail strut seal kit in stock.  I also stock the Yak 50 MLG

actuator seal kits.  Years ago, we manufactured a batch of stainless

tailwheel cylinders for the Yak 50.  We haven't had any calls for them

recently, but I am open to manufacturing another batch.  



Pacific Oil Cooler does a great job on oil coolers.  They also have some

good info on their website:  www.oilcoolers.com .



Jill please give me a contact so I can order a seal kit



thanks



Jill 

M-14P, Inc.

yakxx21

Joined: 10 Jun 2012
Posts: 22

Posted: Sun Jun 17, 2012 9:25 pm Post subject: Re: YAK 50 tail Wheel jack Cylinder

I need to contact JILL to buy a rebuild kit but having trouble due to my useless IT ability..keep sending emails to myself....

Jill please advise your contact details so I can order .



Thank you 



Ken



ken(at)aeroalgarve.com

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