Hi All. I run a B8200 with backhoe attachment. I have recently had both lifting rams serviced with new seals to combat the dropping arm. I do not have great knowledge of hydraulics, would anyone have a suggestion as to why the arm is dropping. I have tried closing the valve on the cylinder but the arm will still drop.
Any help greatly appreciated.
Ian
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Unless the cylinder is in perfect shape, even rebuilt cylinders will leak internally to themselves over time, it's a lot of pressure to hold back for seals on imperfect surfaces. You could seal both ends of the cylinder and still get leak down for the same reason.
I know a lot of rebuilds skip the re-truing and honing of the interior cylinder, just relying on the new seals to do the job. It will work pretty good, but they will still leak down unless they are put back on a lathe, skim cut, and honed.
The difference in leak down is the time it takes. A worn cylinder will leak down constantly, even during use. A seal rebuild will generally make the use leak down go away but you can leave it up and by the next morning it will be down again.
Cylinders and rams are so inexpensive these days that it's a toss up to rebuild or replace one.
