It is operated by four people, three who spin the wheel to turn the drill bit, and a fourth who lifts the bit up and down to punch through tough spots. A water pump system removes the dirt from the ...

Notably, no shaft seal is included, so the pump does leak a bit, but it’s not a major concern assuming you’re just pumping water and don’t mind spilling a bit of excess. Turned with a drill ...

For example, a pair of Parker Denison P14 variable-displacement, axial-piston pumps — a design noted for durability and long service life — powers the drill. The units feature 14 in.