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Author Topic: Hydraulic Cylinder Repair  (Read 23319 times)

Haymaker

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Re: Hydraulic Cylinder Repair
« Reply #8 on: December 26, 2014, 05:12:18 PM »
Well it should unscrew but they sometimes can be difficult. Try soaking it good with a rust penetrating spray like pB blaster or similar and keep working it back and forth. Sometimes if left outside for years it gets rusted up in there.  Its hard to tell from just pics. but make sure there is no other sort of locking mechanism that's keeping it from unscrewing. 
« Last Edit: December 26, 2014, 11:50:49 PM by Haymaker »
  • Tractors- '93 Belarus 825 with loader and others...

imperial1960

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Re: Hydraulic Cylinder Repair
« Reply #7 on: December 26, 2014, 03:10:05 PM »
I have the nut loose and the lock pulled out but gland still locks up as I turn the gland.
Belarus 562 4x4 russian loader bucket

Haymaker

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Re: Hydraulic Cylinder Repair
« Reply #6 on: December 26, 2014, 11:46:58 AM »
That has external threads like mine on the tube. Its made for a pin type spanner wrench to hook up in that hole there.  But a big 24" pipe wrench should remove it too. 

 As for the other little piece of metal that's bent up there.  From the pic it looks like its used as a thread lock for the flange nut.  Mine had allen head set screws in the flange nut I had to remove.  So see if you can stick a punch in there and bent up the end that is making contact with the threads at bit.  Careful not to break it off as when you put it together you can tap it back down again.

If your intention is to take a cylinder apart it maybe easier to break that flange nut loose while its mounted on the loader. Then once you have the nut turning when you have it on the bench in a vice it won't be an issue to take it all apart.  Note have a pan/pail to catch the oil as the cylinder will be full of oil.  Stroke the cylinder rod and catch the oil from each port.


« Last Edit: December 28, 2014, 01:16:09 PM by Haymaker »
  • Tractors- '93 Belarus 825 with loader and others...

imperial1960

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Re: Hydraulic Cylinder Repair
« Reply #5 on: December 26, 2014, 09:47:53 AM »
« Last Edit: December 28, 2014, 01:16:54 PM by Haymaker »
Belarus 562 4x4 russian loader bucket

imperial1960

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Re: Hydraulic Cylinder Repair
« Reply #4 on: December 25, 2014, 06:40:54 PM »
I will post picture of gland nut soon
Belarus 562 4x4 russian loader bucket

Haymaker

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Re: Hydraulic Cylinder Repair
« Reply #3 on: December 25, 2014, 04:26:31 PM »
Question where do the missing pieces of the internal seals end up and on my 562 (russian loader) there is a gland lock on it looks like a curled on the gland.How does the lock come out or does it just turn out with the gland? Where did you get your seals from? Thanks Haymaker

Well if you could post a pic of your cylinder style or find one on the net I could tell you. Odds are though if it's like the pics in the post below the retainer that holds it together threads out.  Some are external like mine or the threads are internal like that blue cylinder I posted. Either way they unscrew and if there old and rusted can be a difficult to come apart sometimes.

As for seals, I went to a shop that specializes in fluid seals called Fluid Seal but any company that sells this sort of stuff including say a hydraulic shop  that repairs them can supply seals.  If you figure out the size you can order them online too.  But the easiest would be to just take all the parts you need replaced to a place that handles seals. They'll be able to match them up.

As for damaged pieces of seals they'll eventually end up in your hydraulic tank/filter hopefully.  Fortunately tractors like Belarus and say Fendts etc. have self contained hydraulic systems so if there is a failure it won't contaminate other components in the transmission.  Most tractors use the transmission sump for hydraulics and use THD fluid.  (Trans, Hydraulic, Differential)
« Last Edit: December 25, 2014, 04:35:33 PM by Haymaker »
  • Tractors- '93 Belarus 825 with loader and others...

imperial1960

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Re: Hydraulic Cylinder Repair
« Reply #2 on: December 25, 2014, 04:10:53 PM »
Question where do the missing pieces of the internal seals end up and on my 562 (russian loader) there is a gland lock on it looks like a curled on the gland.How does the lock come out or does it just turn out with the gland? Where did you get your seals from? Thanks Haymaker
Belarus 562 4x4 russian loader bucket

Haymaker

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Hydraulic Cylinder Repair
« Reply #1 on: December 25, 2014, 02:31:51 PM »
Most small MFD tractors have loaders on just like mine. Recently I repaired the cylinders on the loader on my 825. The loader came on the tractor when I got it but the loader itself is much older than the tractor. Probably from the 1970's and has seen a lot of service over the years on more than one tractor.

The cyl. design and seal types may differ from loader to loader but they all work the same way. This hydraulic cylinder uses a seal cup on the pistons which can fail and rip. Then the cylinder will bypass oil internally. Also these cylinders were leaking externally caused by worn rod seals. Some of the seals were damaged by beat up cylinder rods.

The rod seals can be difficult to get into place in the cylinder head bore again. I like to warm them up with a heat gun so they are more flexible.  Always coat seals with oil when assembling it all back together.



see pics
« Last Edit: December 25, 2014, 04:02:46 PM by Haymaker »
  • Tractors- '93 Belarus 825 with loader and others...