Broken hydraulic Cylinder

JerryG · Jan 22, 2006

Of course the closer you can get a new cylinder to and the attachment points to the original the better off you are. There are things that can be done to get around differences. If you do take it to a good shop they will be able to fix you up with a cylinder that will do the job and will be much less expensive than the OEM item.

MadReferee · Jan 22, 2006

( The maximum operating pressure spec on any hydraulic cylinder needs to be matched to the application, not blown off as insignificant. )

First of all, read my posts. I never said that this wasn't true. My point was with the pin diameter and the fact that commonly available cylinders, be they 2500 psi or 3000 psi, all use the same pin diameter from 2" thru 3-1/2" bores. If pin diameter vs bore size vs PSI was really significant for this application, then don't you think the cylinder manufacturers would build cylinders with pin diameters that would get larger as the bore or psi got larger?

Pin diameter is the least of the posters problems and using either 1" or 1-1/8" has no bearing on this issue other than his backhoe uses a non-standard pin size and the fact that machining might be necessary if he chooses a standard cylinder.

countrybumpkin · Jan 22, 2006

First, thanks for all the replies, I am going to call bailey in the morning and check on a new cylinder and see how much to have 1 1/8 pin mounts put on it. Just to make things a little easier to install. May be worth it before having to buy two new pins, and four new sleeves. After looking at all the specs and realizing that they use 1” pins on bigger cylinders that part doesn’t worry me anymore. One thing I did notice is that the rod sizes are ¼ bigger on the replacements than mine is. After looking at the broken rod it appears to have started bending before it broke, it has a big curve in the rod, I really don’t know what happen I wasn’t watching the cylinder I was watching the bucket. Like I said before it really surprised me that the pump had enough to do that, it usually would just stall out.

RickB · Jan 22, 2006

If you have a non-functioning circuit relief valve on the dipper circuit, you run the risk of trashing another cylinder. Pin diameter may not be important. What caused your initial failure is. I thought the madreferee blew you off with his first post. In fact, I still do. Do not buy a 2500PSI rated cylinder.

countrybumpkin · Jan 22, 2006

That is also the next thing I was going to do was check the releif valves. That was my thoughts on why it may of broke, Of course "walking " the tractor around with the hoe may not of helped matters none.

jmc · Jan 22, 2006

I'd guess the rod failed by buckling (axial compression) as you were curling the dipper near maximum rod extension. The evidence is:

1) rods don't bend in tension and that cylinder couldn't exert enough force to break a properly made rod in pure tension.

2) it failed at mid-length. (unless you extended the cylinder after failure)

Wouldn't be suprised if that's a design defect, especially since the new ones are beefier. Could you have been abusing it at the time or previously too, the failure? (like hammering) A malfunctioning relief valve would contribute to the failure but that cylinder design should have a safety factor large enough to take a fair overload.

John

638 · Jan 22, 2006

I think that I would get the 1 1/4 inch rod end cylinder and bush it down to 1 1/8 inch with a steel bushing rather than go to a 1 inch pin and bush the backhoe

ron

MadReferee · Jan 22, 2006

( I thought the madreferee blew you off with his first post. In fact, I still do. Do not buy a 2500PSI rated cylinder. )

You are entitled to your opinion even though I never said or implied that. And I also never said to buy a 2500psi cylinder. Please reread all my posts.

wushaw · Jan 22, 2006

( That is also the next thing I was going to do was check the releif valves. That was my thoughts on why it may of broke, Of course "walking " the tractor around with the hoe may not of helped matters none. )

I bent a curl cylinder rod on my hoe shortly after I purchased it new and thought it was defected. After thinking about what unnatural things I may have done with, the only thing that came to mind was carrying a rather big stump with it, I may have over stressed the rod because the cylinder rod bent shortly thereafter.
Now after several hundred stumps later and no bent cylinders, I feel any unnatural stresses on the hoe could be costly.

countrybumpkin · Jan 22, 2006

I wouldn't say I was not at fault , like I said before I do pick up the rear of the tractor a lot and move my self around , plus I was trying to pop a stump up out of the ground buy pulling from underneath it. I checked online from bailey and the cost was 244 dollars . I've got a couple places I going to check local on monday too.