We have a 10 year old Aquamatic Hydramatic deck mounted cover system. Other than normal maintenance of sliders and one complete cover replacement, the system has been working great. On startup this year though, the pump doesn't seem to be transferring any movement to the drum.

There is 115V at the switch. Both legs of the 230V at the pump have 115V. The pump appears to spin up when the key is operated but the drum makes non movement at all. The drum is not binding.

I suspect there is something preventing flow of hydraulic fluid but don't know how to check. Any thoughts on how to test hydraulics is appreciated.

Thank you,

Joe M in WV