Re: HYDRAULIC TUTORIAL

Posted by TomG on August 10, 2003 at 04:28:43 from (206.51.253.24):

In Reply to: HYDRAULIC TUTORIAL posted by Wayne on August 09, 2003 at 17:38:28:

I guess this is a stand-alone loader rather than one that works from the tractor hydraulics. I wonder if this is something that's always happened or if it recently developed.

I'm not sure what 'all points raised to restriction' means. It sounds like the problem has happened several times but not all the time and maybe only when the loader is at full height. If so, I'm curious how the loader is lowered when it does happen.

The comment did get me wondering if the bucket valve has a float feature. If it has float, the valve or joystick will go into a detent at one end of its travel and stay in that position. The feature is internal to the control valve section and connects the two sides of a cylinder together and isolates it from the high pressure line. In float the bucket should flop on the ground and follow the ground contour when driving. I wonder if there's a possibility that the problem only happens in float and at full height?

The times I haven't gotten a quick connect in a cylinder line seated, nothing happens when the valve is operated in one direction, but the relief valve does open. In the other direction, The bucket jumps a bit and then the relief valves opens the first time and again after the pressure bleeds down. I wonder if the relief valve opens when the lower valve is operated?

The systems I'm familiar with have the filter in the pump suction line rather than the return line. No reason why one in the return line wouldn't work if it has a screen in the suction line as well. Putting some purely speculative pieces together a loader with a float position and a clogged filter in the return line would definitely cause the problem.

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