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odd hyd. problem

O

old

Well-known Member
Location
Camdenton Missouri
Been working on a flail mower the past few days. I put on a hyd. cylinder yesterday but the tractor a D-17 ran out of gas before I got done so I said the heck with it for the day. So today I gas it up and try the hyds. Well it didn't seem to go up as high as I believed it should. Checks fluid level and it was down so added fluid. Left tractor running and then there was an odd noise form the pump area, then a big bang. Mower had come up good and then the cylinder broke off right at the point it ended from the housing.
So now any guesses as to what in the world happened. I know I sure was glad I was next to the tractor when it broke. because that thing came down hard and the cylinder flipped back fast and hard.
Thanks
Hobby farm
 
Many Allis tractors have low volume high pressure systems, like 3600 psi. Ordinary farm store 2500 psi cylinders might not like that.

Otherwise you may have put the piston rod in a bending bind and that broke it.

Gerald J.
 
Cylinder held up just fine just the shaft snapped off like it wasn't even there or as some would say like a twig. Doesn't look bent but who knows. Went to install another cylinder to see if I could figure it out and found that the hoses for the 2 different cylinders are not the same size or tread. Oh well just playing any how. Or maybe that JD cylinder didn't like being hooked to an AC tractor and off brand mower
 
Lots of cylinders have been broken(ends broken off) because of binding at the ends.Check very carefully before putting pressure on it....
 
If the cylinder, when installed on the peice of equipment it was broken on, cannot be fully "bottomed-out" when in both extended and retracted positions, there is a possiblity that the issue of excessive pressure Gerald could've caused the problem...............

I'd suspect binding of the linkage the cylinder operates and/or the cylinder not being able to fully retract since you mentioned it snapped off when raising the mower........It all depends on how the linkage on your mower is configured but with 3000 + psi. being exerted on the cylinder rod with the mower bouncing across the field, I don't think it'd take long to snap the shaft even if it is 1.5" dia".............

I guess there's always the possiblity of a malfuctioning relief valve(not opening) as well..........
 
I have a low priced 3x8 that I bent the piston rod with a bind. I've bent several others and each time I've taken them to a machine shop with a 50 ton press and they straightened easily. This 3x8 the machinest made me stand way back because he said sometimes they snap instead of straighten and the broken end flies across the shop. This one didn't fly but did snap instead of straightening. It all depends on the total heat treatment of the piston rod. If not tempered enough its brittle.

Be sure neither clevis binds when the cylinder extends. I did that bad when I put a cylinder with a longer stroke on my back hoe boom. Bent badly, it straightened up OK. Bent again, I bent it worse and broke the end of the cylinder. Bought the right cylinder and don't have that problem anymore.

And be sure that the cylinder is rated for the hydraulic pressure your Allis goes to. With the higher pressure you can speed it up with a smaller diamter cylinder and still get the needed force.

Gerald J.
 
No binding since I can flip it up and down with just one hand so thats isn't the problem. I always make sure things move easy when I install things
 
This was at a stand still I have just got to fixing this machine up. Happened sitting in front of my shop so bouncing had nothing to do with it braking. It will go all the way closed but could not say as far as open since it popped as it was going up and I was where I could not see what happened
 
That tells me it was a clearance problem- either an existing bent cylinder shaft, or the yoke and what it was pinned to, had a clearance problem. Might find a flat area where they 'connected'.
 
Is this the first time you've ever used this particular cylinder with this piece of equipment??

If so I'm with Ken and JMS/.MN in that the one of the yokes might be binding...........the binding may be occuring when the cylinder is close to the end of its travel and the yoke on the cylinder begins to bind on the anchor point........it will cause a "lever" effect which will stress the cylinder, likely the rod end by the yoke where it's the weakest..............

Some yokes are "deeper" than others in order to accomodate different/larger anchor points or more rotation of the cylinder............
 
Thats part of the problem I find no place that looks like it was in a bind. No flat places no wear spots etc.
Has me trying to work the new cylinder with out hooking up hyds. to it so as to stop from braking another $100 cylinder like I did this one
 
If the system was low on fluid, maybe it couldn't go as far as it could have. When filled, it spent the last microseconds snapping off! Good luck, I would block the mower up, and place the parts in their normal location and eyeball the geometry.. Jim
 
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