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3-4 Edition 47
Rotary Drills
CAT ROTARY DRILL FEATURES
Solid Structures
Heavy-duty structural tubing and box section frames
provide exceptional durability.
Caterpillar undercarriages with three-point oscillating
suspension, GLT (grease lubricated tracks, double post
upper carrier rollers).
Sturdy Mast
Eachmodel can be configured with various mast lengths
to suit specific application requirements for single pass
or multi pass drilling.
Designed with double-cut lacing in high stress areas to
assure long life, mast structures are made of rectangular
ASTM 500 Grade B steel tubing for all main chords,
cross members and lacing.
This design ensures a torsionally strong mast struc-
ture and reduces deflection and material fatigue.
Four Jack System
Jack casing assemblies are integrally welded to the
main frame providing structural strength and durability
and reduce torsional flexing of the main frame.
The four leveling jacks are positioned to provide excel-
lent stability and weight over the hole plus assure four
points of contact at all times while drilling.
HOBO Wrench
The Hydraulically Operated Break Out wrench is part
of a highly efficient breakout system that increases speed
of pipe changing operations, consequently increasing
productivity.
The hydraulic break out wrench is operated from the
cab thus protecting the operator.
It also reduces impact loading to the mast and rotary
head during pipe changes, further increasing drill mechan-
ical availability.
NOTE:
MD6640 does not store complete drill string in
pipe racks.
Power Group
Fast cycle times are achieved through top of class bit
load, rotary head horsepower, bailing air and a multi-
tude of time-saving systems for maximum efficiency.
Carousel Pipe Rack Option
All Cat drills are equipped with a pipe rack system.
The carousel pipe rack allows rapid pipe changes
safely and efficiently and completely controlled from
inside of operator’s cab.
On the MD6290 or MD6420C, an optional hammer/
tricone carousel allows the operator to rack a complete
drill string (with either DTH hammer and bit, or tricone
bit) in the carousel.
This flexibility allows the operator to change drilling
method as quickly as removing or adding a standard
drill pipe.
Ergonomic Cab
The FOPS certified operator’s cab features well orga-
nized controls, ergonomic operators seat and climate
control.
The cab is sound and thermally insulated keeping
noise levels low and the operator safe and comfortable.
Dust Control System
Part of the stationary rear drill deck, the dust cham-
ber with heavy duty rubber dust curtains and optional
hydraulic lifters front and rear, assures (no visible emis-
sion) dust containment.
Dust chambers are designed with ample space for
deep hole drilling to capture material flushing from the
hole and build the resulting cuttings pile.
Features