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990 lift cylinder questions ?


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#1 TheFarm2004 OFFLINE  

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Posted April 11, 2011 - 02:52 PM

Blew a seal on the lift cylinder Sunday while testing a home made plow. At first I thought it was just the down side fitting but after I got the cylinder in the vice, looks like the end cap is bent. Not sure the picture will show it. Does anyone know what the bore and pressure rating for these thing are? I think I would rather buy a new Parker cylinder than try to rebuild this one. Might be a couple of days before I can get mine apart to see the total damage.

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#2 Texas Deere and Horse OFFLINE  

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Posted April 11, 2011 - 02:55 PM

Was there any keep of retainer in the end of that, or did it just stay there because of the fitting. All I have worked on had a retaining clip or wire inside, or was threaded into the cylinder.

#3 Chuck_050382 OFFLINE  

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Posted April 11, 2011 - 03:05 PM

Was there any keep of retainer in the end of that, or did it just stay there because of the fitting. All I have worked on had a retaining clip or wire inside, or was threaded into the cylinder.


I think on the 990's the fittings are what hold them together, Not sure though I haven't had mine apart.

#4 olcowhand ONLINE  

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Posted April 11, 2011 - 05:41 PM

It's definitely cocked bad in the bore. Should be dead on straight. Any hydraulic cylinder you can buy will excede the capacity of this one. Just match the bore & stroke & you'll be fine. Be sure to take into account the pin to pin extended & retracted length. And yes, the fitting retains the end cap.
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#5 Alc OFFLINE  

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Posted April 11, 2011 - 07:58 PM

Never saw a cylinder that the base end was held on by the fitting so I hope you post pictures of it apart even if you end up getting a new one . Al

#6 NUTNDUN OFFLINE  

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Posted April 11, 2011 - 08:04 PM

I gotta say I have never seen a cylinder held together with the fittings like that before either. Learn something new everyday :D

#7 TheFarm2004 OFFLINE  

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Posted April 12, 2011 - 04:12 PM

Got the darn thing apart. Yep! just the pipe thread adapters hold it all together. Had to drive the rod end out with my trusty 4lb encouragement tool and that stick of maple. Looks like the Harbor Freight O-ring kit will pay for itself. Here is some pictures to tide you guys over till I get into cleaning and repairing that egg-long hole.2011-04-12 16.15.32.jpg

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#8 olcowhand ONLINE  

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Posted April 12, 2011 - 04:35 PM

If you wanted, you could drill into the opposite side of the fitting on the end plug, tap the hole in the plug, & add a retaining bolt there also. About a 5/16" threaded bolt would do fine. You'd just have to be very careful not to drill too far!
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#9 tex tractor jack OFFLINE  

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Posted April 12, 2011 - 05:39 PM

Use a bottoming tap to get good threads in a shallow hole.

good luck

Jack
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#10 olcowhand ONLINE  

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Posted April 12, 2011 - 05:45 PM

Use a bottoming tap to get good threads in a shallow hole.

good luck

Jack


:ditto: Thanks Jack, forgot to add that.

#11 TheFarm2004 OFFLINE  

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Posted April 13, 2011 - 07:06 AM

Use a bottoming tap to get good threads in a shallow hole.

good luck

Jack


Now comes the really hard part of this, explaining to Denise why I need a bottom tap set and lettered drill bit set.

Should these be fine thread, I am thinking 1/4-28 and 2 set screws at 33.3 degrees around.

#12 Alc OFFLINE  

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Posted April 13, 2011 - 07:40 AM

I'm pretty lazy and would just put it back together and after testing it just tack weld the end on , putting a wet rag on it after each tack . If you ever needed to take it apart you could just grind the little weld off , Al

#13 olcowhand ONLINE  

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Posted April 13, 2011 - 08:58 AM

If you add retaining bolts, be sure to bevel the inside edges of all the holes in the cylinder body to allow the o-ring to pass without getting sliced by a sharp edge.

#14 Texas Deere and Horse OFFLINE  

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Posted April 13, 2011 - 10:17 AM

Just asking, but are you sure there is not a groove inside the cylinder bore for a internal snapring or round wire retainer?
I have never seen a cylinder held together with only 1 fitting. Like Daniel and Dad (tex tractor jack) said, you can drill and tap 1 or 2 more retainig bolts into the end of it.

#15 olcowhand ONLINE  

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Posted April 13, 2011 - 11:15 AM

Just asking, but are you sure there is not a groove inside the cylinder bore for a internal snapring or round wire retainer?
I have never seen a cylinder held together with only 1 fitting. Like Daniel and Dad (tex tractor jack) said, you can drill and tap 1 or 2 more retainig bolts into the end of it.


No clip of any type Brian. Can't have, as the plug sticks out & serves for the main pin to the tractor mount.




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