Thanks guys! Yes, only hear it when key is on, engine off. Can't hear it over the engine noise once the engine is running. Clickety-Clack is a good description of the sound.
Just bought a new GC1735MB for light work, very happy with it. But after using the backhoe for just a bit, it started leaking. The dealer said that it was a known issue and is covered under warranty with an updated part. Just posting for anyone that buys a new GC with BH to work it early...