My hoe operated good on my old 763. I bought a nice 773, hooked up the hoe and cannot get it to operate. It is getting hydraulic pressure to the hoe, things try to move, but cannot. This tells me that I have a hydraulic lock and not returning fluid. I put a flow meter on the 773 and I have good flow. Any similar problems or ideas?
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Could the quick couplers be around the wrong way? Try moving the thumb switch one way and operate it, then the opposite, see if the problem goes away.
You should be able to hold the thumb switch one way then pull the trigger to lock it on.
You should be able to hold the thumb switch one way then pull the trigger to lock it on.
I thought about the couplers being reversed, but it should be a open system through the backhoe so if the couplers were reversed things would just operate backwards right?Could the quick couplers be around the wrong way? Try moving the thumb switch one way and operate it, then the opposite, see if the problem goes away.
You should be able to hold the thumb switch one way then pull the trigger to lock it on.
You didn't by chance put a restricting orifice in one of the lines right at the coupler? I found that with the flat face couplers when the orifice is drilled centered on the disk it will close off the flow when flow is reversed. Just a thought though.I thought about the couplers being reversed, but it should be a open system through the backhoe so if the couplers were reversed things would just operate backwards right?
I switched the couplers and it works. I did not think that should make a difference, but it apparently does. So, oil flow to and through the backhoe is directional, AND my 763 and 773 oil flows are opposite.You didn't by chance put a restricting orifice in one of the lines right at the coupler? I found that with the flat face couplers when the orifice is drilled centered on the disk it will close off the flow when flow is reversed. Just a thought though.
Glad it was simple.I switched the couplers and it works. I did not think that should make a difference, but it apparently does. So, oil flow to and through the backhoe is directional, AND my 763 and 773 oil flows are opposite.
Sadly no, they will not operate backwards, running like that can actually blow seals out as you are pumping in high pressure oil into the low pressure side.
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