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Eric[IL] 
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Location: Illinois
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![Quote Eric[IL]](forum_images/quote.png "Quote Eric[IL]") Quote  Reply
 Topic: Need help with hyd cyl seal repair wrench
Posted: 15 Nov 2010 at 11:25am |
Got an AC 715D backhoe that has backhoe & loader hydraulic cylinders with seal caps that range from 3.5"-5.75" in diameter. These seal caps have 3 indentations on them - kinda like a large 3 prong castle nut? As you can see in the pic, a larger cylinder (5.75"dia. cap) on the boom needs a new seal & I am wondering what people use for a wrench to unscrew these cylinder caps? Napa dealer said something about a spanner wrench, but I have not found any that look like they would work. Did AC or other manufacturers make an adjustable head wrench that was applicable for the whole machine?
Chain wrench 3"-6",
large pipe wrench,
what? Thanks in advance for help.
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Big Hunter
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Joined: 12 Sep 2009
Location: maryland
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Posted: 15 Nov 2010 at 11:35am |
I used a large pipe wrench on one. Another time I couldn't budge it so I took it to the dealer. I guess if you were good with a torch and grinder you might be able to make a wrench (if you had a long enough...for leverage... and thick enough piece of steel laying around).
When you get that off and pull the rod out there is a nut on the end of the rod that needs to be torqued to around 500 to 600 pounds if it's like the one I had to deal with. (thats from memory...and I lose memory once in awhile).
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BobHnwO
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Joined: 16 Sep 2009
Location: Jenera Ohio
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Posted: 15 Nov 2010 at 12:21pm |
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Use a flat punch and big hammer,hit counter clockwise to break it loose,then big pipe wrench.
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Why do today what you can put off til tomorrow.
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skipwelte
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Joined: 29 Oct 2009
Location: Anthon, Iowa
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Posted: 15 Nov 2010 at 12:29pm |
We have a spanner wrench here at work for cylinder gland nuts, its a universal tool. Depends on how tight the gland nut is on how good it works. We've had cylinders that were so tight had to weld a heavy iron to the gland nut, put it in the press and work it over with a sledge hammer to break loose, also have heated the end of the barrel-that can cause the barrel to swell and not hold the gland nut, so be carefull there. Ive used the punch-be careful not to damage the nut, use a BIG punch and a BIG hammer, also have use the pipe wrench, use a BIG pipe wrench, sometimes it take a combination of methods to get it to submit!!! HTH
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BobHnwO
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Location: Jenera Ohio
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Posted: 15 Nov 2010 at 12:38pm |
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On second thought,instead of a punch,use a piece of mild steel,less chance of damaging the gland nut!
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Why do today what you can put off til tomorrow.
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Gerald J.
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Location: Hamilton Co, IA
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Posted: 15 Nov 2010 at 12:53pm |
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Randall Machine and welding uses a 50 ton press with V blocks to hold the cylinder and a 4' pipe wrench to remove tough glands.
Gerald J.
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gcalent
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Posted: 15 Nov 2010 at 1:29pm |
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I have a large chain wrench that will do 8" pipe, it`s safer that a pipe wrench on large diameter items. It has a 5' handle and is heavy duty enough to add a cheeter handle if needed. Break the nut loose before you remove the cylinder the machine will hold it better than any vise I know of.
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Pullin With AC
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BobHnwO
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Posted: 15 Nov 2010 at 1:33pm |
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When you remove the piston bolt,you will need 3/4 or 1" impact socket with breakover bar and 10' pipe,I bolt the rod to my front bucket with a 1 or 1 1/4 bolt to hold it solid.
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Why do today what you can put off til tomorrow.
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Eric[IL]
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Location: Illinois
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Posted: 15 Nov 2010 at 2:00pm |
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Gcalent, is your chain wrench an Armstrong Industrial Tool (AIT) 73235 model? Napa sells this tool and says it has a 1.5"-8" diameter range.
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gcalent
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Posted: 16 Nov 2010 at 7:06am |
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I`m not sure of the brand, I think it is a Ridgid, I`ve had it for many years, bought it at an auction, it weighs about 50 pounds. I know it will fit 8" pipe fittings, which are close to 10" outsdie diameter.
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Pullin With AC
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Coke-in-MN
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Location: Afton MN
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Posted: 16 Nov 2010 at 8:38am |
That nut only holds the gland in place and itself is not part of the seal. A large pipe wrench is all I have used on both my 715 and 650 hoe as the cylinders are same OD but the rod is different.
I had to replace the piston on one cylinder along with the gland , piston was made from aluminum to replace the cast iron one, the gland I got from MINNPAR
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Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something.
"Challenges are what make life interesting; overcoming them is what makes life meaningful."
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