I'm trying to troubleshoot a 30 year old lift that has a GMV5000 valve body. I understand this is no longer available, and the general recommendation is that it needs replaced, which involves replacing the controller as well. That's out of their budget. We've replaced the seals that we can do, but the lift constantly settles down. Disconnecting the lift from the valve, the lift stays in place, so it isn't the cylinder. The only thing we are unable to fully test is the solenoid valve for lowering.

Is anyone familiar with these, and have any ideas to try?

[img]https://imgur.com/UIj0drZ[/img]

[img]https://imgur.com/hR08mpB[/img]

You need to replace the two down valve seats/pilots. Easy to do on a Blain or maxton. I'm not sure on the gmv about parts availability

Why not just replace the valve with a maxton? What controller is it? If it's a Montgomery you can usually change a dip switch on one of the boards or get a software chip to update it to work with a maxton

Or you could use a Blaine KV 1P