AC I600 hydraulics leaking
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Construction and other equipment
Forum Description: everything else with orange (or yellow) paint
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=120172
Printed Date: 29 Jul 2025 at 11:11am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: AC I600 hydraulics leaking
Posted By: bgabriel
Subject: AC I600 hydraulics leaking
Date Posted: 10 Mar 2016 at 11:17am
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I recently purchased a 1967 AC I600 tractor. Both the front loader and box blade lose pressure. The box blade in 15 - 30 minutes, overnight for the front loader. I'm not a mechanic but like to perform mechanical tasks that do-able for the mechanically inclined. I've never worked with hydraulics before, but have confirmed the fluid levels are full. Do not see any external leaks around any of the hydraulic components. Is there a suggested recommendation of how one would confirm if the cylinders themselves need to be rebuilt or whether some other part needs to be have seals replaced.
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Replies:
Posted By: Dozer
Date Posted: 10 Mar 2016 at 4:59pm
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It is normal for hydraulic cylinders to leak down with time. Are the hydraulics capable of lifting an appropriate load? If so no problem. Do the hydraulic cylinders leak to the outside? If so remove the cylinder and take it to a hydraulic cylinder repair shop. It is often not a DIY project.
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Posted By: Eric B
Date Posted: 16 Mar 2016 at 1:52pm
Most likely just tired internal seals in the cylinders. I had very bad bleed down on my H3 loader. I took the cylinders in and had them resealed and the difference was far better than I could have expected. The seals simply get tired over time. Just make sure you deal with someone (or shop) that is reasonable. It cost me $300 to do both of them about 6 years ago. You have to decide your own standard of perfection...some shops will insist on making new barrels and that's when it starts getting expensive. I went for reseal only and it's fair to say I got close to 95% results.
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Currently- WD,WC,3WF's,2 D14's B. Previously- I 600,TL745,200,FL9,FR12,H3,816 LBH. Earth has no sorrow that Heaven cannot heal!
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Posted By: bgabriel
Date Posted: 25 Mar 2016 at 12:22am
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Would anyone happen to know what the part number would be to replace the hydraulic filter on the Allis Chalmers I600? My current filter has no part number anywhere on the outside--woren off I'd suspect. Thanks
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Posted By: DiyDave
Date Posted: 25 Mar 2016 at 4:31am
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I may be wrong here, but I think it is a fram PH8A...
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Posted By: bgabriel
Date Posted: 02 Nov 2016 at 2:52pm
In regards to the rear box blade that is on the AC I600 tractor, I was told once that there might be an bypass valve or something like that which could be leaking. I gathered that when the control unit to raise and lower the box blade allows fluid to pass to apply pressure for raising and lowering it, might have a seal that could be leaking inside. Would anyone know where exactly that might be located for removal to have inspected?
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Posted By: Eric B
Date Posted: 02 Nov 2016 at 4:13pm
Probably hard to do a visual or other inspection for a leak with a load on the hydraulics in the back. If you wish to go the trouble of capping the hydraulic lines (3 point lift blocked up while doing the plumbing then remove the blocking) you eliminate the valve being your problem if the 3 point lift still lowers. With the right rear axle housing removed you can see the hydraulic cylinder inside but you might as well remove the whole hydraulic attachment at the back of the differential and take the cylinder out for testing. For the age of these tractors most of them need resealing if hasn't been done before...and maybe mostly because it's not convenient to do and then it's left undone. Both of my D14 tractors are a bit the same but not serious enough to do the repair.
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Currently- WD,WC,3WF's,2 D14's B. Previously- I 600,TL745,200,FL9,FR12,H3,816 LBH. Earth has no sorrow that Heaven cannot heal!
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