180 Leaking Lift-Arm Valve

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   Hi folks,
My 180 has started leaking hydraulic fluid out of the rear valve spool cap for the lift arms - leaking out of the plug #23 in the picture below. It's a slow drip when the arms aren't being used, but has progressed to a steady stream when they're being operated - especially under a heavy load like my bale wrapper.

I'm hoping it's just a dried-up/perished o-ring, and I'll be able to fix by replacing the o-rings #6, 16, 26, and 27. Does this sound like a reasonable first step? Is there anything I should be concerned apart when disassembling that valve body? It looks like the spool has four ball bearing detents that sit inside collar #17, and I'll bet I have to be careful to not lose those and disassemble it carefully and cleanly. But apart from that I'm thinking (hoping) it will be straight forward?

Any thoughts greatly appreciated.

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DanielW Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 19 Sep 2022 Location: Ontario Points: 192	Post Options Post Reply Quote DanielW Report Post Thanks(0) Quote Reply Topic: 180 Leaking Lift-Arm Valve Posted: 10 Jun 2025 at 7:26am
	Hi folks, My 180 has started leaking hydraulic fluid out of the rear valve spool cap for the lift arms - leaking out of the plug #23 in the picture below. It's a slow drip when the arms aren't being used, but has progressed to a steady stream when they're being operated - especially under a heavy load like my bale wrapper. I'm hoping it's just a dried-up/perished o-ring, and I'll be able to fix by replacing the o-rings #6, 16, 26, and 27. Does this sound like a reasonable first step? Is there anything I should be concerned apart when disassembling that valve body? It looks like the spool has four ball bearing detents that sit inside collar #17, and I'll bet I have to be careful to not lose those and disassemble it carefully and cleanly. But apart from that I'm thinking (hoping) it will be straight forward? Any thoughts greatly appreciated.

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DrAllis Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 12 Sep 2009 Points: 21552	Post Options Post Reply Quote DrAllis Report Post Thanks(0) Quote Reply Posted: 13 hours 27 minutes ago at 4:55pm
	#20 I gave up years ago trying to use a screwdriver to loosen or tighten. I use a vise-grips by sliding the spring cup ahead and having the other end of the spool correctly clamped in a vise. The detent balls are a problem !!! especially if you've never dealt with them before. #27 I try to avoid replacing unless I have to. You'll see why if you do.

DanielW Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 19 Sep 2022 Location: Ontario Points: 192	Post Options Post Reply Quote DanielW Report Post Thanks(0) Quote Reply Posted: 11 hours 32 minutes ago at 6:50pm
	Thanks Doc! Got it done yesterday, and just like you I used vice grips on #20. Didn't remove the detent adjustment set-screw (#21) as the whole end under the cap was very much rusted and seized. Probably could have got it with the right careful application of heat, but I was worried if it didn't loosen, then I'd have melted the #27 o-ring with no way of replacing it. And because I need this tractor for baling and wrapping in the near future. I didn't want to risk it. So far so good, o-ring #6 was definitely scarred. Edited by DanielW - 11 hours 23 minutes ago at 6:59pm

randy Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 12 Sep 2009 Location: Illinois Points: 1211	Post Options Post Reply Quote randy Report Post Thanks(0) Quote Reply Posted: 8 hours 35 minutes ago at 9:47pm
	Mine is leaking out the hole also. Is there a step by step on how to fix it somewhere?
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