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Caterpillar Global Mining
Cat® MD6420 Rotary Blasthole Drill (13 or 16 m Mast)

Cat® MD6420 Rotary Blasthole Drill (13 or 16 m Mast)

Product catalog summary

Specifications Overview
The Cat® MD6420 Rotary Blasthole Drill is available with mast configurations of 13 or 16 meters. It supports hole diameters up to 311 mm (12.25 in) and offers single-pass depths of 16.46 m (54 ft) for the 16 m mast and 13.4 m (44 ft) for the 13 m mast. Multi-pass depths can reach up to 65.2 m (214 ft) and 74.4 m (244 ft) respectively. The drill operates in temperatures from -28°C (-20°F) to 52°C (125°F), with a cold weather option down to -40°C (-40°F), and at altitudes up to 4,572 m (15,000 ft).

Performance and Capacity
The drill has a pull-down capacity of up to 383 kN (86,000 lbf) and a hoist capacity of 15,970 kg (35,207 lbf). Drilling feed rates range from 0-19 m/min (0-61 fpm), with retract rates up to 33.5 m/min (110 fpm). The rotary drive system offers rotation speeds of 0-110 rpm, with an optional increase to 150 rpm, and torque up to 15,185 Nm (11,200 ft-lb).

Engine and Cooling Systems
The standard engine is a Caterpillar C27 Tier II with 597 kW (800 hp), with an optional Cummins QST-30 engine offering up to 783 kW (1,050 hp). Cooling systems include dual fans with a standard ambient rating of 52°C (125°F).

Compressor Options
Standard and optional compressors are oil-flooded, single-stage screw types, with discharge air flows from 42.5 m3/min (1,500 cfm) to 67.9 m3/min (2,400 cfm) and maximum operating pressures up to 34.4 bar (500 psi).

Operator's Cab and Controls
The cab is shock-mounted, FOPS certified, and includes climate control. Operator controls cover engine, compressor, and drilling operations, with optional indicators and gauges available.

Undercarriage and Mobility
The undercarriage features triple grouser pads and sealed, oil-flooded rollers. The maximum tram speed is 2.27 km/h (1.41 mph), with gradeability up to 46%.

Hydraulic and Lubrication Systems
The hydraulic system includes multiple pumps and motors with pressure ratings up to 414 bar (6,000 psi). The lubrication system is centralized, with optional automatic lubrication.

Accessories and Handling Equipment
Optional drill pipes and handling equipment are available, with various sizes and configurations. The deck wrench and HOBO break-out wrench are hydraulically operated.

Shipping and Dimensions
The MD6420 is shipped in multiple components, with the main drill unit weighing approximately 68,039 kg (150,000 lb) and the mast assembly weighing 24,494 kg (54,000 lb).

Specifications:
1. MD6420 Components:
- Mast: Available in 13 or 16 meters.
- Deck Piece: Dimensions are 4.14 m (13 ft 8 in) L x 0.66 m (2 ft 2 in) W x 1.47 m (4 ft 10 in) H, weighing 635 kg (1,400 lb).
- Cab Half: Dimensions are 3.45 m (11 ft 4 in) L x 1.42 m (4 ft 8 in) W x 1.52 m (5 ft 0 in) H, weighing 725 kg (1,600 lb).
- Additional Mast Rests: Dimensions are 3.05 m (10 ft 0 in) L x 2.24 m (7 ft 3 in) W x 0.41 m (1 ft 4 in) H, weighing 425 kg (1,600 lb).

Notes:
- Final dimensions, gross vehicle weight (GVW), and load-out vary based on selected options and final configuration.
- Performance ratings assume 100% efficiency and are based on engineering specifications and calculations according to industry standards.
- Capacities may vary with drilling conditions.
- Specifications are subject to change without notice.

Additional Information:
- For more details on Cat products, dealer services, and industry solutions, visit mining.cat.com and www.cat.com.
- © 2012 Caterpillar Inc. All rights reserved. Trademarks include CAT, CATERPILLAR, and others.

Catalog excerpts

Cat® MD6420 Rotary Blasthole Drill (13 or 16 m Mast)-1

Hole diameter Depth single pass (16 m config) 16.46 m (54 ft) Depth single pass (13 m config) 13.4 m (44 ft) Operating Temperature Min. ambient rating (standard) -28°C (-20°F) Cold weather option -40°C (-40°F) Max. ambient rating (standard) 52°C (125°F) Pull-down/Hoisting Capacity Pull-down capacity Hoist capacity Drilling feed rate Retract rate Pull-down cylinder stroke Head travel (16 m config) Pull-down cylinder stroke Head travel (13 m config) Open-loop hydraulic (stationary barrel, moving rod) Cylinder bore Pull-down/Hoisting Capacity (continued) Cable type Cable sheaves (cylinder) Cable sheaves (top and bottom) 457 mm OD (18 in) Sheave pins with roller bearing 70 mm (2.75 in) diameter Sheave guards Standard at bottom plate Adjustable head guide shoes Rotary Drive System Rotation speed Horsepower capacity Main thrust bearing Drive motor Steel with replaceable Casting design Taper roller Straight spur

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Cat® MD6420 Rotary Blasthole Drill (13 or 16 m Mast)-2

Rotary Blasth Cooler Assembly Radiator-CAC-Oil Cooler Assembly Cat® C27 (Non-cert, Tierll) Single, front-end mounted Cooler width Cooler height Engine radiator Sealed deaeriation tank, pressure cap, overflow tube & sight glass Standard ambient rating Radiator-Oil Cooler Assembly Single, front-end mounted Cooler width Cooler height Engine radiator Sealed deaeriation tank, pressure cap, overflow tube & sight glass Standard ambient rating Radiator-CAC-Oil Cooler Assembly Cummins QST-30 Split-mounted on opposite sides of the deck Cooler width Cooler height Engine radiator Standard ambient rating...

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Cat® MD6420 Rotary Blasthole Drill (13 or 16 m Mast)-3

Rotary Blasthole Drill (13 or 16 m Mast)—MD6420 Compressor (Standard) single-stage screw Discharge air flow (sea level) Dry-type with safety Air-to-oil cooler, thermostatically controlled Vertical barrier element, (44 gal) sump, vertical tank Direct coupled to engine Automatic with safety Compressor (Optional) Hydraulic cylinder-operated from operator's seat single-stage screw Discharge air flow (sea level) Dry-type with safety Air-to-oil cooler, thermostatically controlled Vertical barrier element, (44 gal) sump, vertical tank Direct coupled to engine Automatic with safety Compressor (Optional)...

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Cat® MD6420 Rotary Blasthole Drill (13 or 16 m Mast)-4

Rotary Blasthole Drill (13 or 16 m Mast)—MD6420 Engine (continued) Engine (Optional) Rated horsepower Full load Starting system Safety shut-down system Dry-type with safety element Jacket water cooling and/or CAC Fuel tank Turbo and manifold covers Blankets and/or exhaust wrap rectangular tubing, welded Main chord size Pivot and raising area Rectangular tubing A frame, reinforced in high-stress areas Hydraulic lines Pressure-rated steel hydraulic Hose rack Mast-Elevating Cylinders Sheet steel trough for moving hoses Cylinder bore Cylinder stroke Lift capacity each cylinder 960 kN (215,875 lbf)...

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Cat® MD6420 Rotary Blasthole Drill (13 or 16 m Mast)-5

Rotary Blasthole Drill (13 or 16 m Mast)—MD6420 Operator's Controls (continued) Standard Drilling Controls Leveling jacks controls (hydraulic) HOBO/Break-out wrench control (electric) Mast elevation control (hydraulic) Pull-down control (electric over hydraulic) Pull-down pressure control (pilot hydraulic) Rotation control (electric over hydraulic) Propel controls (electric over hydraulic) Carousel in/out control (electric) Carousel indexing (electric) Mast lock (electric) Dust/water injection (electric) Dust curtain (electric) Deck wrench control (electric) Level indicator (electric) On/off...

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Cat® MD6420 Rotary Blasthole Drill (13 or 16 m Mast)-6

Rotary Blasthole Drill (13 or 16 m Mast)—MD6420 Hydraulic System Left Track/Rotation Pump (Closed-Loop) Axial piston, variable Right Track Pump (Closed-Loop) Axial piston, variable Accessory Circuit/Feed Pump (Open-Loop) Axial piston, variable Pressure Rating Fan Circuit Pump (Open-Loop) Pressure Rating Track Drive Motors (2) Axial piston Pressure Rating Rotation Drive Motors (2) Axial piston fixed Pressure Rating Pressure Rating Pump Drive Gearbox Rubber coupler/drive shaft Filtration (All Alters have indicators and bypass) Main return Case return Hydraulic System (continued) Oil Cooling System...

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Cat® MD6420 Rotary Blasthole Drill (13 or 16 m Mast)-7

Rotary Blasthole Drill (13 or 16 m Mast) Accessories, Tools & Handling Equipment Deck Wrench Drill deck Wrench plate Wrench positioning Hydraulic cylinder Impact means HOBO Break-Out Wrench Lower left, outside mast Wrench type Patented HOBO (Hydraulic Pipe Rack (Inside the Mast) Carousel with stationary pods and breaker plates Pipe rack swing Pipe rack index Hydraulic cylinder with Cable size Safety hook Swivel-type positive lock

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Cat® MD6420 Rotary Blasthole Drill (13 or 16 m Mast)-8

Rotary Blasthole Drill (13 or 16 m Mast)—MD6420 Basic Shipping Weights and Dimensions Quantity Description of Goods Approximate Dimensions Model MD6420 (13 or 16 m mast) Rotary Blasthole Drill to include toolbox (stowed inside: bit basket, horseshoe bushing, lifting bk sub on deck; Operator's manual and blow-down hose in cab Model MD6420 (13 or 16 m mast) Mast assembly to include dust hood, large shock sub with adapter and safety sling stowed within Deck piece for MD6420 (13 or 16 m mast) Additional mast rests for MD6420 (13 or 16 m mast) (mounted off Note: Final dimensions, GVW and corresponding...

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