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A loader/hydraulic question

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Randy Bagrowski

12-08-2005 04:21:22

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I'm just curious.. I have a Dearborn Model 19-42 loader. The original directions say to only "handtighten" the 4 hydraulic cylinders. Any idea why they would say this? I'm thinking maybe it was some type of simple excessive pressure bleed-off solution. When I got the loader, the lift arms ( cylinders) were leaking. I took a gigantic pipe wrench and tightened them. They are way beyond hand tight.They don't leak anymore and the loader runs fine! Any thoughts??

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Carl S in NH

12-08-2005 13:30:33

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Re: A loader/hydraulic question in reply to Randy Bagrowski, 12-08-2005 04:21:22

Zane,
Thanks for the very informative answer to that question. I'm wondering if that advice would apply to my situation too. I've got a Wagner loader and it has down pressure, so I believe I have the double acting cylinders. I've owned the tractor for 23 years and they've never given me any trouble yet. But it would be nice to know what to do if they should start leaking. Would they have to be rebuilt with the same chevron type packing, or is there an o-ring that could be used instead? Thanks in advance.
Carl S.

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ZANE

12-08-2005 12:24:53

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Re: A loader/hydraulic question in reply to Randy Bagrowski, 12-08-2005 04:21:22

Back when the dinasours roamed the earth and there were no rubber O rings all hydraulic cylinders had either steel rings like the N tractor ram cylinder or they had what you loader has for cylinder piston and rod packing. It is called Chevron packing. It is a material that is impregnated with graphite and the reason it is called "Chevron" is that the cross section looks like the chevron striped on a first Sgt in the army except they are round and are open at one point around the circle. The individural chevron seals ends are staggered so that no gaps are present in the seals. Usually three or more of these chevron seals are in a packing kit along with a wiper seal to go outside on the rod of the cylinder to wipe off dirt etc.

There are two reasons not to over tighten the packing nuts. One it will prematurely wear the packing out and two it will even cut the metal off the rod if too tight over time. The packing should be just tight enough to prevent leakage at the rod or end of the cylinder. The piston in the two way cylinders that use the chevron packing have two sets of chevrons facing in opposite directions of the lip of the seals. The nut that holds the piston to the end of the cylinder rod acts as the packing tensioner.

The one way cylinders do not have packing on a piston. The rod is the actual piston and the oil pressuer pushes against the entire rod to produce lift.

Zane

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Tejas

12-08-2005 08:47:58

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Re: A loader/hydraulic question in reply to Randy Bagrowski, 12-08-2005 04:21:22

Sometimes seals have ware. I'm no Guru, but it sounds to me like you fixed it.
Good luck.
LeRoy

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