I think we are missing something in your explanation of the problem. If the pedals move with the engine running, then you should have hyd movement of the boom or bucket, unless, you do not have flow from your hydraulic pump to the control valve. First check the hydraulic oil level in the oil tank. Next I would unlock your auxillary control handle at the top of the right driving lever and rotate it up or down to activate the control valve and see if the engine pulls down when the valve is activated. If the oil level is full and the auxillary handle movement does not cause the engine to pull down, then you probably will need to remove the hydraulic pump and check it. When the hydraulic pump is off check the end of the hydrostat pump shaft the hydraulic pump mates with to make sure the splines are not stripped or the end of the hydrostat shaft broken into pieces. It is also possible the control valve relief valve is stuck open, but even that should allow enough oil through to slowly move the bucket.