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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

Bent Hydraulic Cylinder Shafts

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Bill Charleston

07-17-2004 13:32:36

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I have a 1958 case 420B backhoe with aftermarket hydraulic cylinders on the loader bucket. The shafts have bent twice.....I need to know the original specifications for the cylinder diameter, shaft diameter and length of stroke so I can get a better match. Anybody know where I can look, or better yet find some original cylinders?

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Doc Holiday

07-18-2004 21:08:27

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Re: Bent Hydraulic Cylinder Shafts in reply to Bill Charleston, 07-17-2004 13:32:36

Are you sure you don't have a binding problem at some point during use?

I've run into sprung cylinder problems on equipment a few times that was caused by the anchor end of the cylinder binding on its mounting point when the cylinder was at one extreme of its travel.

Probably would be a good idea to watch the cylinders very closely while someone else operates the equipment slowly.

Doc

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Bill Charleston

07-19-2004 07:25:23

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Re: Re: Bent Hydraulic Cylinder Shafts in reply to Doc Holiday, 07-18-2004 21:08:27

When I bought these cylinders about 2 months ago one of the things I checked was the spacing between the mounting points and the anchors on the cylinders. It appeared that there was ample space. I also shimmed them carefully to insure that travel was perpendicular only. All ends were carefully lubricated. So, It must be something I am doing to cause it.

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BobMo

07-17-2004 21:35:57

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Re: Bent Hydraulic Cylinder Shafts in reply to Bill Charleston, 07-17-2004 13:32:36

I think you've got more problems than just bent cylinder rods. What you need to check is the way its being used. Or where your weak point is thats allowing it to spring out of alighment and bend the rods..... .

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Bill Charleston

07-18-2004 00:09:51

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Re: Re: Bent Hydraulic Cylinder Shafts in reply to BobMo, 07-17-2004 21:35:57

Believe me, I have looked at the way I use the tractor. I do not horse it at all. I checked the alignment and have reshimmed at both ends of the hydraulic cylinder to make sure alignment is straight. This the 2nd set of cylinders I have put on....it came with 2.5 inch aftermarket "Cross" brand cylinders and 1 inch rods. They even looked flimsy, so I thought that was the problem. The machinist I have straightening these shafts seems to think that the material in them is too soft.

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george md

07-19-2004 18:53:30

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Re: Re: Re: Bent Hydraulic Cylinder Shafts in reply to Bill Charleston, 07-18-2004 00:09:51

Bill,

Most of the case hyd cyls have heat treated rods. If you show up at a hyd shop with a case rod with gouges or other surface damage they will rechrome but won't make one from standard chrome rod. Straightening , no matter how well you cushion
the vee blocks and the press ram, will leave a flat
spot that will leak in time. Pressing on case cyl
rods will many times chase you around the shop as
the pieces fly. New standard chrome rod is not as expensive as
most think, the last 1 1/2 rod I got was 1.30 an
inch and I put the eye end on and turned and cut
the threads in the other.

george

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Bill Charleston

07-19-2004 23:24:00

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Re: Re: Re: Re: Bent Hydraulic Cylinder Shafts in reply to george md, 07-19-2004 18:53:30

George,
In order to change to 11/2 rod diameter I have to buy the new rod material, new end pieces for the cylinders, have the rods turned to fit the existing connectors,and buy new pistons and packing. The machinist estimated that if I went to hardest material it would cost me about $155.00 per cylinder. I just paid $158.00 per each new 2 months ago. So, I decided to straighten what I have and see how long it will last; that's given the fact that I will need new end pieces anyway if I switch to a larger diamater shaft.....

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