Posted by Heat Houser on July 22, 2009 at 17:42:30 from (69.66.35.73):
In Reply to: Here is a diagram posted by jdemaris on July 22, 2009 at 11:26:33:
Looking at the diagram, the loader valve and the swing/stab valve are power beyond. If all the loader spools are in neutral, oil from the 17 GPM flows to the Bm Crd Bkt valve from the loader valve's power beyond port. The 9 GPM flows to the swing/stab valve and if the spools are in neutral, the flow goes back and tees into the inlet pipe to the Bm Crd Bkt valve. (from upper left of sw valve to tee on rt side of BmCrdBkt valve)
What I suspect your problem is: When you load the boom or other function Crd Bkt, the 17 GPM is flowing backward thru the tee and exiting to tank thru the swing/stab valve some where. Since there isn't a detailed schematic of the swing/stab valve I will speculate. The unit works good when cold so suspect a valve section casting is cracked or has a pin hole. A quick test would be to leave the divertor poking oil at the power steering circuit. Remove the pipe from the tee and cap both ends. If the boom now works fine, the oil is backflushing thru the swing/stab valve. I think there should be an isolating check valve in the sw valve to prevent the Bm flow from poking backwards into the 9GPM curcuit.
Your problem should be in the swing/stab valve for when you operate swing, you are blocking the backflush from the 17GPM from getting to tank.
Hope this explanation helps but I have made a few assumptions so it may not be 100%.
BTW, most valves that have three ports, pump in, tank out, and the third goes to the next valve down stream is a power beyond set up.
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