We are choosing HF150 drilling machine for now.But we are not comfortably with the mud pump for the following reasons:1-the engine running it2-its been running by belt.3-we are not sure if it can work well in hole diameter of 8inc with challenging underground gravel with in160m depth. 4-the engine does not have radiator.So there for I think you are going to help me get some thing good. So my geological formations in muddy areas here is challenging ,sandy, gravels too much collapsing and it is really challenging makes drilling so difficult.Thanks hugs yours sincerely Isaac baraka. Hope hearing from you soon