My Sumitomo sh75 blade bleeds off from max height to ground level in about 2.5 seconds. Bleeds both ways up or down. I purchased the machine with this issue and I'm not sure how long it's been like this.
I have ran numerous tests on the cylinders come to the conclusion that both lift cylinders do not bypass, and are if good shape.
After consulting a hydraulics professional, he enlightened me that all cylinders like that need a "hold valve", but I can not find it.
Blade function is controlled by a cable activated sliding rod. The valve has 4 ports. Pressure,return to tank,A&B.
I've tracked the cylinder lines all the way from the actuator valve into the orbital valve, out the botom of the orbital valve, through the frame to the cylinders with no "hold valve" to be found.
Also no hold valve on cylinders, pipe thread to hydraulic fitting.
To be specific,
What am I missing?
Do all cylinders need hold valves?
Is the hold valve built into the actuator valve?
Any input is appreciated. Thanks
I have ran numerous tests on the cylinders come to the conclusion that both lift cylinders do not bypass, and are if good shape.
After consulting a hydraulics professional, he enlightened me that all cylinders like that need a "hold valve", but I can not find it.
Blade function is controlled by a cable activated sliding rod. The valve has 4 ports. Pressure,return to tank,A&B.
I've tracked the cylinder lines all the way from the actuator valve into the orbital valve, out the botom of the orbital valve, through the frame to the cylinders with no "hold valve" to be found.
Also no hold valve on cylinders, pipe thread to hydraulic fitting.
To be specific,
What am I missing?
Do all cylinders need hold valves?
Is the hold valve built into the actuator valve?
Any input is appreciated. Thanks