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Message: <blockquote data-quote="IndianaJohn" data-source="post: 75897" data-attributes="member: 10633"><p>Well, thought I would post another update in case anyone is still following along at home. Shortly after I got the machine running, I noticed that I was leaving a trail of hydraulic oil from somewhere underneath. A little investigation revealed that there was a leak coming from the cap on the pressure relief valve that is mounted underneath the bucket valve. At first it seemed that it was just a bad o-ring under the cap. So I took the cap off and replaced the o-ring. Still leaked. Took it apart and tried an o-ring with a bit larger cross section. Went to tighten the cap down again and it twisted off. Damn! Apparently the cap was cracked where it joined the thread part. That explained why replacing the o-ring didn't fix the leak. So as a stop gap so I could use the machine to get some work done, I welded the cap into place onto the valve body. It worked but I never had any power at the bucket rams. But, it was that way before the "repair" too. So I wound up going back to Surplus Center to a order a new Prince 2000 psi pressure relief valve to replace the old (and apparently worn out) original Greesen valve. In the mean time, I was able to find a later version of the parts manual. You may recall that I mentioned earlier in this thread that the manual showed a cartridge style "strainer" and also a spin on oil filter for the hydraulic system, while my machine only has a cartridge style filter. I had also noticed that the manual showed a single three spool Greesen valve for bucket, boom, and auxiliary functions, while my unit has two individual valves. One single spool for the bucket, and a second two spool unit for boom and auxiliary. And the first manual also didn't show a seperate pressure relief, but instead has a relief built into the spool valve. Well, the newer manual shows that the newer machines ARE differently plumbed from the older units. As I had suspected, the newer machines no longer had the spin-on filter, but only the cartridge unit. Also, the manual clearly shows the later machines having two valves, just like mine, as well as the seperate relief valve. Maybe this will help someone else figure out which manual is correct for their machine, or at least whether they have an early machine or a late one. Anyway, to get back to the story, after replacing the PRV (and another hose.....) I now have plenty of hydraulic pressure. In fact, if I only have engine running at a fast idle, when I curl the bucket back to its stops, it will kill the engine! Before, I could raise more weight with the boom cylinders than I could by curling the bucket. I'm guessing that was simply because of the larger cylinders on the boom. I fully expect now that the bucket should be able to lift much more than it could before. I know on my tractor, if I can't lift something with the loader boom itself, I can normally curl the bucket back and be able to get it off the ground. Just the opposite of what I've had with this machine. I'm hoping that with the much improved pressure, I'll see similar behavior to my tractor now. However, I just got the new valve on yesterday, and we've had constant storms since, so I'll have to wait for Mother Nature to cooperate before I'll know for sure. Next up, building a ROPS for it.......</p></blockquote><p></p>

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