On all drill rigs, not just ours, there can often be difficulty separating the drill rods (“un-threading”) when coming out of the hole after drilling.
It can also operate at higher pressures for more torque (turning force). This is a piston-type motor and is much more efficient than traditional hydraulic motors. This particular DR150 track rig was fitted with an optional high torque motor on the tophead.
The the winch sheave assembly at the top of the mast can be hydraulically extended to 21 feet for easy handling of standard 20 foot casing and pipe. This is essential when installing the casing and pump into the finished well.
With a press of a lever, the drilling motor assembly (the tophead) slides over to the left and gives completely clear access to the borehole for the winch. All the DR150 rigs feature a sliding tophead.
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