Back in the 70's my uncle and dad built this digger but didn't have big enough tractors to pull it. Dad pulled his DC behind his 900 and my uncle used his Dc behind his 560. If I remember right he used a cable like is used on a truck hoist to control the throttle. He used a set of ropes and pulleys to engage and disengage the clutch on the D. The D didn't have hydraulics so some pipes and hoses ran up to the 900 for the digger. I am on the D just for the picture. The year following the one pictured he dualled up the D and the 900 but we don't have any pictures of that. Dad drove the 900, he used it for a few years until he got the G1000 MM.