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Hydraulic Cylinder Rebuild


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#1 Bigdaddydon ONLINE  

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Posted May 06, 2014 - 10:49 AM

I have an optional hydro lift pump and cylinder.  I want to rebuild the cylinder before I put everything back together.

 

I have the inlet elbows removed but I am not sure how to remove the piston and rod.  Everything I see says it should be easy.  How much force should it take? or is this unit welded and not rebuild able.

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#2 olcowhand ONLINE  

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Posted May 06, 2014 - 03:43 PM

Once you have the fitting out at the rod end (as you already do), you just use the rod like a slide hammer & pull it all out.  If it's stubborn, put the rod's clevis in a vise, then a large rod through the body end hole.  Then you can tap that large rod with a hammer to pull the body off the rod/piston assembly.


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#3 bhts OFFLINE  

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Posted May 06, 2014 - 04:01 PM

Once you have the fitting out at the rod end (as you already do), you just use the rod like a slide hammer & pull it all out.  If it's stubborn, put the rod's clevis in a vise, then a large rod through the body end hole.  Then you can tap that large rod with a hammer to pull the body off the rod/piston assembly.

:ditto:



#4 Bigdaddydon ONLINE  

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Posted May 06, 2014 - 05:23 PM

Thanks guys,

 

I thought that was it but I sure didn't want to work it to hard if there was something else in the way.



#5 olcowhand ONLINE  

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Posted May 06, 2014 - 05:25 PM

Oh, and the plug end should drive out as well.  The fittings hold both ends in place.



#6 Bill 76 OFFLINE  

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Posted May 06, 2014 - 05:44 PM

If all else fails,plug the end by the clevis and using pipe reducers put a grease fitting on the other end,use you grease gun and pump it full,the hydraulic pressure should blow the end off.
Down side of doing this will be a heck of a mess.


Sorry I guess that won't work---I did'nt know the fittings held the end on the body

Edited by Bill 76, May 06, 2014 - 05:49 PM.


#7 olcowhand ONLINE  

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Posted May 06, 2014 - 06:36 PM

If all else fails,plug the end by the clevis and using pipe reducers put a grease fitting on the other end,use you grease gun and pump it full,the hydraulic pressure should blow the end off.
Down side of doing this will be a heck of a mess.


Sorry I guess that won't work---I did'nt know the fittings held the end on the body

 

That would still work, as a standard pipe plug will hold either plug in place, and use grease fitting in the other.


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#8 Bolens 1000 ONLINE  

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Posted May 06, 2014 - 08:07 PM

:ditto:

 

The fittings hold everything in place

Sometimes they can be a PITA to remove if they are rusty......



#9 Alc ONLINE  

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Posted May 06, 2014 - 08:29 PM

I'm not following this :( if I'm reading this correctly there isn't anything holding the gland  in place ?



#10 olcowhand ONLINE  

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Posted May 06, 2014 - 08:31 PM

I'm not following this :( if I'm reading this correctly there isn't anything holding the gland  in place ?

 

The hydraulic hose fitting retain the gland & end plug.  They go into them with national pipe threads.


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#11 Alc ONLINE  

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Posted May 06, 2014 - 08:34 PM

OK  the threads the fittings go into are really in the nut ? Well that makes sense thanks

l


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#12 Bolens 1000 ONLINE  

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Posted May 06, 2014 - 08:44 PM

18709_1.png


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#13 Bigdaddydon ONLINE  

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Posted May 07, 2014 - 07:48 AM

So with the help of some PB Blaster and a couple of taps with a flat punch the ends did come off.  Now the clevis end does not want to come off.  It has soaked overnight in PB Blaster.  I'll give it another try later today.


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#14 Bigdaddydon ONLINE  

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Posted May 07, 2014 - 07:57 PM

After soaking the clevis with PB Blaster overnight it still didn't want to move.  I applied some heat and that did the trick. 

 

It really is a very easy rebuild, the only issue is getting the old parts to come apart.

 

So with the cylinder pulled apart and everything primed and waiting to dry I moved on to cleaning up the pump.  I picked it up and moved the directional lever and heard a pop and a rattle.  I pulled it apart and sure enough the spring has broken.

 

Does anybody have the spring?  #1722 021

And the Gasket?  #1722 039

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#15 Bolens 1000 ONLINE  

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Posted May 07, 2014 - 08:07 PM

After soaking the clevis with PB Blaster overnight it still didn't want to move.  I applied some heat and that did the trick. 

 

It really is a very easy rebuild, the only issue is getting the old parts to come apart.

 

So with the cylinder pulled apart and everything primed and waiting to dry I moved on to cleaning up the pump.  I picked it up and moved the directional lever and heard a pop and a rattle.  I pulled it apart and sure enough the spring has broken.

 

Does anybody have the spring?  #1722 021

And the Gasket?  #1722 039

 

Sent you a PM on the spring

I have the seals,O-Rings, and Gaskets all in stock for these.






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