I just bought an older Case d100. I'm running it on a Bobcat S130. It has a couple of leaks, but other than that it works good except for the boom. Even with the machine running at low RPM's, the boom moves way too fast. I mean you have to move the control lever, ever so slightly, or it just slams up or down, whichever way you're moving it. The bucket and the crowd move like you would expect, in relation to how you move the lever, but the boom moves like you just woke it up and it's pissed off. Any ideas why?
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SkidRoe
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I have heard other users talk about the swing on their Bobcat units moving too rapidly, and having to install flow restrictors in the lines to the swing cylinders. It sounds like the same problem as your having, just on a different cylinder. The flow restrictor is a disc of metal with a small hole in it that installs in either a cylinder or valve port, underneath the fitting. If you make these yourself, start with a small hole, like 1/16"; if it is too small drill them out with a larger drill, working your way up. HTH - SR
Thanks for the reply. Odd that it is just that one cylinder though. So wouldn't the restrictor place more strain on the system ahead of it, holding back flow?
SkidRoe
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Could be that the other functions already have restrictors. The restrictor will not put much more strain on the system than feathering the valve.
Train I would try keeping the hoist or the crowd valve open slightly when operating the swing this would help with pressure spikes on the swing. This should also make it smoother to operate all of the controls.
I've noticed that helped, but it's a little hard for me to coordinate right now. I have an old Case backhoe on a 530 tractor, and the spools are lined up a little different. I can play those like a piano, even though I'm not a trained operator. I suppose with some more practise on the small machine, I'll get better.
I just noticed this thread , have the same backhoe with the same problem. To cure it put a restrictor orifice in the valve body, take the hose off where it exits the valve body and put it in there. I made them on the lathe with 3/32 hole and it works just right for me. Mine also had factory installed orifices in some of the hoses but the holes were too big. If you want real control you can buy adjustable flow valves and put them in also. Engine rpm is another thing , don't have to run it much over a fast idle.
Thanks Jerry. This will save a lot of time and guessing.
