If a backhoe, any make, is plumbed for a hammer, can a the same plumbing and controls be used to operate an hydraulic thumb? Thanks.
Many times no. A hammer or hoepac use 1 way flow and the other line is piped directly to the tank. To run a thumb you need 2 way flow.
Your auxiliary relief valves need to be adjusted accordingly as well. For example your thumb may use only 125 bar while your hammer may need to be set at 250 bar.