A aviation & planes forum. AviationBanter

If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below.

Go Back   Home » AviationBanter forum » rec.aviation newsgroups » Soaring
Site Map Home Register Authors List Search Today's Posts Mark Forums Read Web Partners

Cobra Hydraulic Jack



 
 
Thread Tools Display Modes
  #1  
Old December 11th 08, 07:36 PM posted to rec.aviation.soaring
HL Falbaum[_2_]
external usenet poster
 
Posts: 63
Default Cobra Hydraulic Jack

I finally got a defective Cobra Ramp jack apart, without shaped charges!
01's advice helped a lot. My wife doesn't allow shaped charges in the
basement, either.

I have found a few potentially correctible problems inside, and wonder if
there may be a market for jacks overhauled to much higher standards. I
would visualize a core-exchange type arrangement. It would be more expensive
than a replacement but not by much, and might last a lot longer. I'd have to
find a souce for one gasket, but not a big problem.

Any serious interest out there?

If so, I would need a couple more discarded jacks both old a new model, to
buy cheaply. I have two right now, old model. Any takers?



--
Hartley Falbaum


Ads
  #2  
Old December 11th 08, 07:54 PM posted to rec.aviation.soaring
Andy[_1_]
external usenet poster
 
Posts: 1,565
Default Cobra Hydraulic Jack

On Dec 11, 11:36*am, "HL Falbaum" wrote:

Any serious interest out there?


I could be interested in a seal and gasket kit. Finding the parts
usually takes longer than doing the work.

When my Cobra jack leaked in the first few weeks of use I was sent a
replacement, but it was the wrong type. I swapped the primary
cylinders between the 2 jacks and fixed my problem. Not much else in
there except the secondary piston seal and the ball valve.

Andy
  #3  
Old December 11th 08, 09:18 PM posted to rec.aviation.soaring
HL Falbaum[_2_]
external usenet poster
 
Posts: 63
Default Cobra Hydraulic Jack


"Andy" wrote in message
...
On Dec 11, 11:36 am, "HL Falbaum" wrote:

Any serious interest out there?


I could be interested in a seal and gasket kit. Finding the parts
usually takes longer than doing the work.

When my Cobra jack leaked in the first few weeks of use I was sent a
replacement, but it was the wrong type. I swapped the primary
cylinders between the 2 jacks and fixed my problem. Not much else in
there except the secondary piston seal and the ball valve.

Andy

One particular gasket is peculiar. The rest are O-rings.

In addition, there are 3 ball-check valves that can leak-down. Each of these
are in crudely made seats, and the balls themselves are not of the highest
order. The release valve is driven by a crudely made pin which does put the
pressure off center. The actuating screw of the valve is not a good fit in
the casting, being a bit loose.

It is sometimes hard to tell exactly where the leak is, as the oil f lows
"all over".
I have had 4 leaky ramp jacks, with leaks from 2 different places--the small
piston actuated by the lever, and the release valve.

Anyone else located other leaks, or any collapses without leaks to the
outside?


Thanks

Hartley Falbaum
KF USA



  #4  
Old December 12th 08, 09:31 PM posted to rec.aviation.soaring
[email protected]
external usenet poster
 
Posts: 72
Default Cobra Hydraulic Jack

Hi Hartley,

I have a leaky jack from a 2001 Cobra trailer. Not sure if that is
considered old or new. Not sure where it leaks from, but I refill it
and it works ok for a variable period of time. Have considered
replacing it, but have not gotten around to it yet.

WD

  #5  
Old December 12th 08, 09:45 PM posted to rec.aviation.soaring
HL Falbaum[_2_]
external usenet poster
 
Posts: 63
Default Cobra Hydraulic Jack


wrote in message
...
Hi Hartley,

I have a leaky jack from a 2001 Cobra trailer. Not sure if that is
considered old or new. Not sure where it leaks from, but I refill it
and it works ok for a variable period of time. Have considered
replacing it, but have not gotten around to it yet.

WD


Hi WD:

If you can, it would be helpful to try to locate the leak.
Next time you see a trace of leaking, wrap a half sheet of paper towel
around the piston which is driven by the foot lever. Wrap another around the
release valve stem (the lever that allows collapse) . With the jack
collapsed, as for storage, close the relese valve. Check frequently and one
of them will be oily.
Does it collapse in the raised position with weight on it? (this might
signify another problem altogether)
Let me know what you find.

Thanks

Hartley



 




Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Cobra hydraulic bottle jacks - where to buy? [email protected] Soaring 20 August 17th 17 06:15 AM
Hanger Queen meets Cobra - Cobra Girl 05.jpg (1/1) Glenn[_2_] Aviation Photos 0 September 19th 08 03:41 PM
Cobra Hydraulic Jack - oil replentishment Gary Emerson Soaring 4 March 25th 05 07:47 PM
Cobra jack warning Andy Durbin Soaring 8 June 30th 04 02:32 AM
Servicing Cobra Hydraulic foot pumps mike pitoniak Soaring 13 March 9th 04 05:04 PM


All times are GMT +1. The time now is 06:54 AM.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.
Copyright 2004-2020 AviationBanter.
The comments are property of their posters.