Awesome explanation and tutorial. Is it safe to assume then, that if a spool is in the neutral position, and there are no port reliefs installed on that valve, if the cylinder was pressurized by external force like a thumb mechanism on the Auxiliary being pushed against by the bucket curl on an excavator, the fluid has no place to go and would either bend a cylinder, break a mount, burst a hose or even damage the valve?
I need your help , i have a digger that it sounded like it was laboring when i moved the bucket with out load on it , so i thought about how to test what was happening and i took both hoses off the cylinder and i hooked together with a T and a pressure gauge and the pressure rises to over 2000Lb just moving oil in a loop , it’s a cluster of valves with 8 spools , do you think it’s leaking internally between spools or what do you think the problem is ? It’s feeding pressure to both hoses simultaneously
What happens if the rod end is overpressurised? There appears to be no pressure relief for it? Okay, I see now. That is a likely scenario for the bucket, but not for the boom, hence the lack on the rod end of the boom.
Thank you for the great videos. By any chance can you do a video explaining how the BICS valve interacts with the hydraulic spool assembly?
Hi
I was missing a movie like this.
Great job, perfectly explained.
I just hope my English allowed me to understand everything well 😅. Regards.
Awesome explanation and tutorial. Is it safe to assume then, that if a spool is in the neutral position, and there are no port reliefs installed on that valve, if the cylinder was pressurized by external force like a thumb mechanism on the Auxiliary being pushed against by the bucket curl on an excavator, the fluid has no place to go and would either bend a cylinder, break a mount, burst a hose or even damage the valve?
@henrylevi3836 yes. Bent cylinders and blown hoses... if the external force is great enough
I need your help , i have a digger that it sounded like it was laboring when i moved the bucket with out load on it , so i thought about how to test what was happening and i took both hoses off the cylinder and i hooked together with a T and a pressure gauge and the pressure rises to over 2000Lb just moving oil in a loop , it’s a cluster of valves with 8 spools , do you think it’s leaking internally between spools or what do you think the problem is ? It’s feeding pressure to both hoses simultaneously
What happens if the rod end is overpressurised? There appears to be no pressure relief for it? Okay, I see now. That is a likely scenario for the bucket, but not for the boom, hence the lack on the rod end of the boom.
Bingo. A lot of wheel loaders have no port reliefs in the loader lift circuit. They just build the components to take the abuse