Hydraulic cylinder rebuild

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seahaul
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Hydraulic cylinder rebuild

Postby seahaul » Thu Aug 06, 2015 7:09 pm

I have a LoBoy 154 with 3-pt hitch that leaks down. Trying to rebuild the cylinder but cannot figure out how to remove the end cap in order to get to the o-rings inside. The end looks like just a seal without any holes to insert a tool to unscrew it. There is nothing on the outside that holds the cap in place.
Has anyone taken this cylinder apart and can tell me how to remove the end cap?

Bob McCarty
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Re: Hydraulic cylinder rebuild

Postby Bob McCarty » Thu Aug 06, 2015 7:38 pm

I haven't worked on one before, but here's a page from the parts manual: http://www.cleancomputes.com/Cub/Number ... e%2009.jpg
It looks like you might be able to just pull it apart (?).

Bob
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we need to think differently."
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Eugene
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Re: Hydraulic cylinder rebuild

Postby Eugene » Thu Aug 06, 2015 7:47 pm

Is the cylinder leaking hydraulic fluid to the outside/external? If there is no external hydraulic fluid leak, the diverter valve is the probable source of the leak down.
I have an excuse. CRS.

seahaul
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Tractors Owned: LoBoy 185 with Woods mower
LoBoy 184 with Woods mower and 3-pt
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Circle of Safety: Y

Re: Hydraulic cylinder rebuild

Postby seahaul » Fri Aug 07, 2015 8:43 am

No fluid is leaking to the outside. Wasn't sure whether the problem was with the cylinder or diverter so I thought I'd fix both just to be sure. I'll do the diverter first and see if that fixes the problem.
Thanks for your help. The parts diagram helps greatly too.
Charlie

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gitractorman
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Re: Hydraulic cylinder rebuild

Postby gitractorman » Fri Aug 07, 2015 12:59 pm

What do you mean about the hydraulics leaking down? If you mean that the hitch eventually lowers to the ground when you've parked the tractor overnight, that's common. When they engine is shut down the hydraulics release and allow everything to drop. There's nothing you can do to fix it.

Now, if while the engine is running, the hitch gradually drops, then you have a leak in the system somewhere, and it would almost have to be a leak to the open, not internally, meaning you should have hydraulic fluid loss and laying somewhere. There isn't anywhere for the system to lose pressure without the system losing oil. Meaning, you would have to top off the hydraulic oil all the time. If this isn't the case, then I'd say you don't have a problem.
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Re: Hydraulic cylinder rebuild

Postby Eugene » Fri Aug 07, 2015 7:11 pm

gitractorman wrote:If you mean that the hitch eventually lowers to the ground when you've parked the tractor overnight, that's common. When they engine is shut down the hydraulics release and allow everything to drop.
The hydraulic system on my 154 does not leak down when the engine is shut off.

I don't know how your hydraulic system in plumbed. My 154 has two diverter valves.

One other location of check for the hydraulic leak down is the control valve.

Edit: The service manual has diagrams of some of the different hydraulic systems installed on numbered Cub Low-Boys.
I have an excuse. CRS.

seahaul
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Tractors Owned: LoBoy 185 with Woods mower
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Re: Hydraulic cylinder rebuild

Postby seahaul » Sat Aug 08, 2015 9:17 am

My 3-pt will "leak down" while the engine is running, but there is no loss of fluid to the outside anywhere. I suppose there can be one (or more) causes: lift cylinder, control valve (mounted under the gas tank to lift up/down), or the selector valve (mounted on the tunnel cover,to choose use of 3-pt or belly mower lift).
This appears to be a pretty common problem as I have three LoBoys and they all do this. One of these does not have the selector valve (mounted on the tunnel cover) so I've ruled out that possibility, at least for that tractor.
Since I still have not found a way to take the lift cylinder apart, I will concentrate on rebuilding the control valve for now. Will let you know what works.
Charlie

seahaul
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Re: Hydraulic cylinder rebuild

Postby seahaul » Sat Aug 08, 2015 4:36 pm

I found the answer to my original question, "how to take the cylinder apart?" After disconnecting the hydraulic hose, you can look through the hole and see the end of the piston rod. It has a "stop pin" inserted through the rod that prevents the rod from being pushed all the way out of the cylinder. With a magnet, I was able to remove that stop pin and then the rod pulled right out.
There is a rubber o-ring (wiper?) on the piston rod that can be replaced. Hopefully this will stop the 3-pt from leaking down.
Charlie

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Re: Hydraulic cylinder rebuild

Postby BigBill » Mon Dec 18, 2017 7:56 pm

If your not seeing any oil leaking on the outside then there is a leak down within the system.

You have a selector or diverter valve that selects the rear 3pt hitch or the center lift for the mower. The selector valve could be leaking down. It takes 9/16” square o rings. My int154 #1 has the same problem.
I'm technically misunderstood at times i guess its been this way my whole life so why should it change now.

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Re: Hydraulic cylinder rebuild

Postby tmays » Sun Jan 07, 2018 1:18 pm

I have the same problem, but no 3 point. Just a belly mower. Leaks down rather quickly while running. Curious to know what the problem was when you find it
Thomas

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Re: Hydraulic cylinder rebuild

Postby Eugene » Sun Jan 07, 2018 5:49 pm

BigBill wrote:If your not seeing any oil leaking on the outside then there is a leak down within the system.

You have a selector or diverter valve that selects the rear 3pt hitch or the center lift for the mower. The selector valve could be leaking down. It takes 9/16” square o rings.
Selector valve if your tractor has no diverter valve.
I have an excuse. CRS.


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