Hydraulic cylinder

I just had a 3" Minneapolis Moline cylinder split into. Why would this happen? It was powered by a UTU
and it was lifting an Allis Chalmers 12' disk.
 
Im guessing it was a later cylinder made by Cross? Where did it split? Do you have a picture? Wouldn't think a U has enough pressure to do much damage.
 
I will try and get a picture, but it was a Minneapolis Moline cylinder
made of the one piece cast iron with two ends bolted on. Split from the
top of the cylinder to the piston cylinder. I always thought these cylinders
were indestructible.
 
Did you always have the cylinder? Just wondering if not, maybe someone used it on a high pressure system and did the damage and then it showed up when you used it. Im betting the U didn't do the damage otherwise that would have been a widespread problem years ago when they first came out.
 
You said it was on an AC disc, you don't suppose it was hitched to an AC tractor at some point? The WD and WD45 had a four thousand pound hydraulic system, that will most surely blow one those old Uni-Matic cylinders to pieces.
 
This is the picture of the cylinder. I'm wondering if the bypass valve would be stuck. And would this be located in the cylinder or is it in the valve body
of the tractor. And how much pressure would build up by the hydraulic pump?
 
photo of cylinder
IMG_0674_zpsiglyevsj.jpg
 
It was a cylinder I have used on this tractor before.
I didn't notice anything different from previous times
before the split. I'm a little scared to place another cylinder
on it before I know the cause.
 
I have used Teflon tape on pipe fittings and then tightened too much and cracked old castings. Could this be the case?
 
I would agree about the possibility of it getting cracked from a fitting, and then breaking when in use.
 
I have one I recently had rebuilt. The rod was broken. My hydraulic guy didn't realize how low pressure the application is and told me it was leaking. I asked him what he was testing it at and he told me 3000. We dialed tbe pressure down and it works great. He is really good at what he does just unfamiliar with m&m. That being said I think it was probably over torque. I'm not saying extra pressure is good on things but mine leaked at the end caps. I bought it off a pallet of scrap for $2 with a broken rod from a farmer that used it on farmall tractors.
 
I really don't know why this cylinder cracked like it did.
It has been on this disc for several years and always stored inside in the winter
But like you I had another cylinder with a broken piston rod and was able to use the parts to
make a good one. I have a IHC cylinder on the disc now. If that one breaks then I
must have a bad relief valve on the tractor.
 
How do you get an IHC cylinder to work? I tried it and mine drops the implement as soon as I let off the leaver. Getting .one fixed cost me $200. They made a new rod for it.
 
I have what they call a four port lock out. It takes the place of the check valve in the
cylinders. Northern Hydraulics sells them for around $70. You can use any cylinder after
placing this unit in.
 
Thanks for the pic. I've heard these but I didn't really trust the idea. I may get one now that I see somone else having luck with them.
 

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