753 hydraulic solenoid knocking and bucket lift tilt not working

[ramdino]

So went out to my 753 circa 2000 +/- today to spread some gravel and I noticed a knocking noise directly under the seat on the right side about at my butt cheek. I could tell it was some type of solenoid. The pedals would not work unless I could time it just right in between knocks. I have no active warnings. When I put pressure on the pedals the knocking stops, but they will not move. I recently replaced a hydraulic cylinder and the system did get low on hydro oil before I could get it back to a place to work on it. I have used it since the cylinder was replaced and it was fine. Could this fix be it or would it be something a little more serious?

 

[Tazza]

I didn't think you'd be able to hear a solenoid over the motor running. Could it be the park brake solenoid clicking on and off? it could be low voltage, bad switch?
I can't think of anything else there that could make a clunking noise. The other option is to lift the cab and start it to see if you can hear just where the noise is coming from.