Built tough, these drills have reliable components, sturdy frames, robust booms and feeds that contribute to outstanding availability. They are designed to be easy to service with conveniences such as ground level access to all major service points and well-organized electrical and hydraulic arrangements. Available in two models MD5125 C and MD5125 CL.

Hole Diameter 89 mm-152 mm (3.5 in-6.0 in)
Hole Depth 30 m (98.5 ft)
Air Compressor 11.3 m³/min (400 ft3/min)

General Data
Hole Depth Maximum 98.5 ft
Compressor 11.3 m³/min @ 7 bar (400 ft3/min @ 100 psi)
Compressor @ 7 bar (100 psi) 11.3 m³/min (400 ft3/min)
Engine Cat® C11 Tier 3 242 kW (325 hp) @ 1,800 rpm
Hole Diameter Range 89 mm-152 mm (3.5 in-6.0 in)
Rock Drill HPR5128 37.0 hp

Components Pressurized swing cab
Components Heater/AC pressurizer
Components AM/FM radio/CD player
Components CB radio (optional)
Components Adjustable seat
Components Emergency egress

Feed System - MD5125 C
Chain Force 4535 kgf (10,000 lbf)
Components Replaceable wear pads
Components Set up for 51, 60, or 68 mm drill steel
Components Will change a 3.66 m (12 ft) drill steel
Components Manual inclinator
Components Power centralizer
Components Model HUFH12 hydraulic motor driven steel channel feed
Dump 149° from 10° of boom
Feed Channels (2) 7.0 in
Feed Extension 3.0 ft
Feed Rate 121.0 ft/min
Feed Swing 36° L to 37° R

Air Compressor
Components Hydraulic motor driven
Screw-Type Compressor 189 L/sec @ 7 bar (400 ft3/min @ 100 psi)

Power Train
Altitude Before Derating 11000.0 ft
Ambient Temperature Capability 125.0 ° F
Components Cat C11 Tier 3 Diesel, 242 kW (325 hp) @ 1,800 rpm
Components Six (6) cylinder, electronically controlled, water-cooled, turbocharged and air-to-air after-cooled
Components Dual element air filter
Engine Speed Engine speed is automatically controlled by power demand
Fuel Tank - Dual Fill 110.0 gal

Dimensional Specifications and Weights
Shipping Height 11.5 ft
Shipping Length 34.8 ft
Shipping Weight MD5125 C 43500.0 lb
Shipping Weight MD5125 CL 45000.0 lb
Shipping Width 8.6 ft

Linear Rod Changer System
3.66 m (12 ft) Rod Changer 51 mm - 5 Rod +1 or 60 mm - 4 Rod +1 or 68 mm - 4 Rod +1
3.66 m (12 ft) Rod Changer Maximum total hole depth with 3.66 m (12 ft) starter steel: 21 m (70.5 ft)
6.1 m (20 ft) Rod Changer 51 mm - 4 Rod +1 or 60 mm - 3 Rod +1 or 68 mm - 3 Rod +1
6.1 m (20 ft) Rod Changer Maximum total hole depth with 6.1 m (20 ft) starter steel: 30 m (98.5 ft)

Boom System - MD5125 CL
Boom Dump Below Horizontal 7.0 Degrees
Boom Length 9.0 ft
Boom Lift Above Horizontal 27.0 Degrees
Boom Swing 15° L to 21° R

Rock Drill
Blow Rate 2,500-3,100 bpm
HPR5128 Hydraulic Powered Percussion Rock Drill - Blow Rate 2,500-3,100 bpm
HPR5128 Hydraulic Powered Percussion Rock Drill - Motors Dual hydraulic variable rotation motors producing 2,033 N·m (1,500 lbf-ft) torque
HPR5128 Hydraulic Powered Percussion Rock Drill - Output Energy @ 210 rpm 37.0 hp
HPR5128 Hydraulic Powered Percussion Rock Drill - Percussion Pressure Up to 2750.0 psi
HPR5128 Hydraulic Powered Percussion Rock Drill - Rock Drill Auto Lube System Option
HPR5128 Hydraulic Powered Percussion Rock Drill - Rod Diameter Choices Rod diameter 51, 60, or 68 mm
HPR5128 Hydraulic Powered Percussion Rock Drill - Weight 900.0 lb

Special Features Standard cabs have front window push-out for emergency egress
Special Features Emergency stop in the cab and on the feed
Special Features All proper guards in place
Special Features Feed swipe rope engine shut off
Special Features Ground-level access to service points and well-organized electrical and hydraulic designs
Special Features Heavy duty steps and handles are strategically placed and non-slip
Special Features Three points of contact at all steps
Special Features Spring-applied, hydraulically released brakes

Boom System - MD5125 C
Boom Dump Below Horizontal 29.0 Degrees
Boom Extension 3.0 ft
Boom Length 8.5 ft
Boom Lift Above Horizontal 57.0 Degrees
Boom Swing 15° L to 21° R

Feed System - MD5125 CL
Chain Force 4535 kgf (10,000 lbf)
Components Power centralizer
Components Manual inclinator
Components Will change a 6.10 m (20 ft) drill steel
Components Model HUFH20 hydraulic motor driven steel channel feed
Components Set up for 51, 60, or 68 mm drill steel
Dump 132° max 16° min
Feed Extension 3.0 ft
Feed Rate 121.0 ft/min
Feed Swing 14° L to 37° R

Components Hydraulic motor-driven track assemblies
Components Triple rock grousers
Components Spring applied disc brakes
Gradeability 35.0 Degrees
Ground Clearance 11.0 in
Ground Pressure 18.0 psi
Track Gauge 78.0 in
Track Oscillation ±8°
Tram Maximum Speed 2.1 mph
Wide Triple Grouser Pads 15.0 in

Shutdown Features
Causes High compressor discharge temperature
Causes High engine-water temperature
Causes Low engine-oil pressure
Causes Emergency stop (3 locations)
Causes Low hydraulic oil level

Dust Collecting System
Abrasive Resistant Suction Hose 6.0 in
Components Pneumatic filter purge system
Components Reverse pulse filter cleaning system
Components Hydraulic motor powered, dry dust collecting system
Components Dust collector sized to clean holes up to 152.4 mm (6 in) diameter
Filter Area 465.0 ft2

Optional Rock Drills
Type HPR6832
Type HPR6030

Cooler Package
Components Coolers for engine, hydraulic and compressor systems and ATAAC
Components Side by side arrangement
Components Sized for ambient capability of 52° C (125° F)
Fan Assembly 42.0 in

Hydraulic System
Components Full flow cooling
Components Designed to minimize power consumption
Components Precisely matches pump pressure and flow to load conditions
Components Full flow 10 micron filtration
Components The hydraulic system is a four-pump system
Components Manual fill pump
Pressurized and Sealed Tank 80.0 gal

Model Comparison
Tailored to Your Application

Model Comparison

MD5125 C
Shorter boom and feed height. Particularly well suited in uneven terrain or in locations overhead clearance is limited.

MD5125 CL
Longer boom length and feed is ideal for drilling deep holes with few rod changes. Boom is fixed and in ready position.

Pattern Coverage
Far Reaching

Pattern Coverage

To negotiate overhead limitations or uneven terrain the 3.66 m (12 ft) feed and the heavy-duty 2.6 m (8.5 ft) telescopic boom on the MD5125 C gives a lower operating range and extends an additional 0.9 m (3 ft) when needed. The MD5125 CL is always in ready position with its non-telescopic 2.8 m (9 ft) boom.

MD5125 C
  • Telescopic boom 2.6 m (8.5 ft)
  • Boom extension 0.9 m (3 ft)
  • The boom swing capability of the MD5125 C is 15° L to 21° R

MD5125 CL
  • Larger non-telescopic boom 2.8 m (9 ft)
  • Boom is in ready position and does not extend
  • The boom swing capability of the MD5125 CL is 15° L to 21° R

Rock Drills
Proven Performers

Rock Drills

MD5125 utilizes the HPR5128 hydraulic powered percussion rock drill rated at 28 kW (37.5 hp) output energy with dual hydraulic variable rotation motors producing 1898 N∙m (1,400 lbf-ft) torque.

Reliable Performer
Low cost of ownership and reliability are yours with renowned Cat Rock Drills. Building on a legacy of simplistic power, these drills have long life expectancy and are field serviceable. This combination of robust design and easy maintenance means more hours of reliable, low-cost operation. For added efficiency, the pistons are matched to the cross section of the shank so the wave form is properly matched for maximum energy transfer to the bit.

Durable Design
A simple design coupled with high strength materials yields exceptional durability.
  • Having only half of the components of competitive models, there are fewer internal parts to wear
  • There are four major housings bolted together with high strength flanges eliminating troublesome long tie rods
  • Long life alloy bushings
  • Fast response large accumulators provide a smooth and efficient hydraulic oscillation

Owner Serviceable
Cat Rock Drills are so simple that owner serviceability is a viable alternative and cost savings.
  • Other models require servicing in a clean room environment
  • All maintenance and rebuilds can be done in your shop and some maintenance can even be done with the rock drill still mounted to the feed
  • Accumulator assemblies may be replaced in the field
  • Troubleshooting is easy since there are half the components of other drills

New Automated Rock Drill Lube System
Peak performance is sustained when your rock drill is kept lubricated, cool, and automatically maintained with our new Auto Rock Drill Lube System. Operators no longer have to stop drilling to manually grease the rock drill every two hours.
  • Components reach full life expectancy at proper lube intervals
  • Grease reservoir capacity can hold enough for up to five 10 hour shifts
  • A timer board cycles the grease pump throughout the day eliminating maintenance time
  • High and low pressure conditions are continually monitored through the display screen

Rod Changer
Improve Your Productivity

Rod Changer

Providing you with proven versatility, the MD5125 is equipped with a sturdy rod changer that holds multiple rods allowing the boom extension to reach far and drill deep while maintaining stability. Each feed and rod changer can accommodate various lengths and diameters of drill steel. The selection and use of drill steel varies based on the desired hole depth and diameter per the blasting plan.

Boom and Feed
Reach Further

Boom and Feed

A sturdy boom and feed support the carousel rod changer providing excellent pattern coverage and fewer required setups. The heavy-duty boom is constructed of thick square tubing with steel plate reinforcements in key areas to add strength. Built with high strength steel channels with diagonal internal bracing, the feed system resists torsion and thrust loads.

  • Telescopic boom on MD5125 C is 2.6 m (8.5 ft)
  • Extension on MD5125 C boom adds 0.9 m (3 ft)
  • Fixed boom on MD5125 CL is 2.8 m (9 ft)
  • Boom swing capability of both models is 15° L to 21° R
  • Boom limit switch prevents swinging into the cab
  • MD5125 C feed is 3.66 m (12 ft)
  • MD5125 CL feed is 6.10 m (20 ft)
  • Both models are equipped with a 0.9 m (3 ft) feed extension
  • Feed force is 4535 kgf (10,000 lbf)
  • Rock Drill travel feed rate 36.9 m/min (121 ft/min)
  • Lighting on the feed illuminates the rod changer and hole site

Manage Your Terrain


The undercarriage on the MD5125 provides excellent maneuverability thanks to its low center of gravity and high ground clearance which is beneficial in tough terrain.

  • Excavator-type track rollers
  • Two speed final drive motors
  • Case hardened steel track bushings
  • Wide triple grouser track pads 380 mm (15 in)
  • Static load each 29 938 kg (66,000 lb)
  • Dynamic load sealed 9979 kg (22,000 lb)
  • Hydraulically released spring applied disc brakes
  • Ground clearance 280 mm (11 in)
  • Gradeability 35°
  • Ground pressure 1.31 bar (19.2 psi)
  • Track gauge 198 cm (78 in)
  • Tram maximum speed 3.44 km/h (2.1 mph)
  • Oscillation ±8°

Power Group
Ready to Work

Power Group

You can depend on exceptional reliability with the MD5125 thanks to the large cooler, powerful engine, hard working compressor, and efficient hydraulic system.

The MD5125 gets the job done with the Cat C11 Tier 3 with 242 kW (325 hp) @ 1,800 rpm. This six (6) cylinder Cat engine is electronically controlled, water-cooled, and turbocharged. Fuel conservation, and the resulting lower operating cost, is achieved with automatic throttle control based on power demand. Additional engine features:
  • Four pump drive-box with maximum input rating 504 kW (675 hp)
  • Dual-element air filter
  • Dual-fill 416 L (110 gal) fuel tank
  • Altitude before derating 3353 m (11,000 ft)

  • Coolers for engine, hydraulic, compressor systems
  • 52° C (125° F) ambient temperature
  • ATAAC side by side arrangement
  • Easy troubleshooting and cleaning of coils

  • Excellent flushing power
  • Reliable rotary screw-type compressor
  • Hydraulically driven
  • High pressure rating 189 L/sec (400 ft3/min) @ 7 bar (100 psi)
  • Dual-element air filters with indicators

  • Designed to minimize power consumption
  • Precisely matches pump pressure and flow to load conditions
  • Large hydraulic tank with greater cooling capacity for longer intervals between oil usage 303 L (80 gal)
  • The hydraulic system is a four-pump system

Unique, Adaptable Swing Style


This uniquely designed Cat Swing Cab features comforts and conveniences that help make the MD5125 a highly productive track drill. It is specially mounted on hydraulic cylinders that can swing and tilt the cab. This design provides the flexibility to position the operator well away from acoustic sources or hazardous environments encountered in a mine site or on a construction job.
  • Swings up to 48° and tilts 30°
  • Swing function provides maximum visibility and pattern coverage
  • Tilt allows for leveling on uneven terrain
  • Electronic two-axis angle indicator
  • Pressurized environment with filtered circulating air
  • Climate control system maintains a consistent temperature
  • Air is filtered to the operator
  • Adjustable bucket seat with seat belt
  • Full vision tinted glass windows
  • Ergonomic drilling and tramming controls
  • Easy access to cab air filter
  • AM/FM radio IPOD/MP3 player ready
  • Communications radio ready

Safety Features
  • Skylight provides excellent visibility of the drill string
  • Boom limit switch keeps boom from swinging into cab
  • Mirrors assist in moving the machine
  • Heavy duty handles and controls
  • Ground level shutdowns
  • Two drilling lights
  • Fire extinguishers
  • Three speed window wipers
  • Auto-thread greaser is operated from within the cab
  • FOPS option available
  • Ground level access into cab

Dust Collection
Keep It Clean

Dust Collection

The Cat HDE 1200 Dust Collector is robust and efficient. Powered to clean holes up to 15.24 cm (6 in), the heavy-duty system effectively manages rock fragments and dust and is easy to clean and service.

  • The pick up pot contains a seal to the drill steel which traps cuttings
  • Abrasive resistant dust hose is 152.4 mm (6 in)
  • Timed cleaning is continual through reverse-pulses of air
  • Vacuum generated air flow conveys material through the system
  • Filtration area is 42 m2 (465 ft2) and separates the solid particles from the clean air
  • Dust collector swings out for interior access
  • Replacing dust seal is easy with only one bolt removal
  • Optional water injection system can be used to suppress dust and hole-collaring or mudding the top hole to create a natural seal

Neat and Easy


To simplify your maintenance requirements, Cat Track Drills have well-organized electrical and hydraulic designs. This helps provide longer equipment life cycle, lower operating costs, and higher re-sale value.

  • Wide access doors and ample room provide easy access to components for servicing
  • Components are logically located and neatly arranged
  • Manual valve bank for operating in the event of an electrical loss and also to help isolate issues with electronics or hydraulics

Supported by World-class Cat Dealer Network
From helping you choose the right machine to keeping your equipment up and running, your Cat dealer provides the best in sales and service.
  • Best-in-class parts availability because Cat dealers understand the value of your uptime
  • Preventive maintenance programs are available to maximize your return on investment, achieve full equipment life cycle, and managing costs
  • Guaranteed maintenance contracts help you forecast your businesses needs and strategically plan for service and parts expenses
  • Operator training to help boost your productivity
  • Genuine Cat Remanufactured parts are available

Taking Care


Equipped with numerous safety features, Cat Track Drills are designed to provide a safe working environment for operators as well as maintenance and service technicians.

MD5125 Track Drill Safety Features
  • Non-slip, heavy duty steps and handles are strategically placed
  • Spring applied, hydraulically released brakes
  • Fire extinguishers
  • Ground-level access to service points

Cab Safety Features
  • Skylight allows viewing the top of the feed
  • Front window push-out for emergency egress
  • Mirrors assist in safely moving the machine
  • Three speed window wipers
  • Optional FOPS structure
  • Ground level access into cab

Safety Shutdown System
  • Feed mounted swipe string
  • Emergency stop in cab
  • Boom limit switch
  • Low engine oil pressure
  • High engine water temperature
  • High air compressor temperature
  • Low hydraulic oil level

Operator Training
  • Classroom style training available
  • High quality manuals for operation, maintenance, and service
  • Hands-on training with your local Cat dealer

For Generations


While helping you increase the efficiency and productivity of your business, Cat Drill designs help minimize the environmental impact of mining. We continually strive to develop equipment that has more respect for the air we breathe and the earth we share.

MD5125 Sustainability Features
  • Fuel economy is achieved with automatic engine throttle control based on power demand
  • Remanufactured components are available
  • Auto lube systems are clean and efficient
  • Major components can be rebuilt

Standard Equipment

  • Hydraulic, motor-driven, track assemblies with 380 mm (15 in) grousers, hydraulic cylinder controlled track oscillation, hydraulic released, spring applied, disc brakes and triple rock grousers
  • Cat C11 Tier 3, six (6) cylinder, electronically controlled, water-cooled, turbocharged and air-to-air after-cooled diesel engine rated at 242 kW (325 hp) at 1,800 rpm
  • The engine speed is automatically controlled by power demand
  • Four (4) dedicated hydraulic pumps, two (2) fixed displacement traction two-speed drive motors and one (1) variable displacement compressor drive motor
  • Hydraulic motor-driven 189 L/sec @ 7 bar (400 ft3/min @ 100 psi) screw-type compressor
  • Coolers for engine, hydraulic, compressor systems
  • 52° C (125° F) ambient temperature
  • ATAAC side by side arrangement
  • 2.6 m (8.5 ft) telescopic boom system with 0.9 m (3 ft) extension
  • 0.91 m (3 ft) feed extension complete with a drill positioner and an offset feed table
  • 2.75 m (9 ft) Fixed Swing Boom System
  • Model HUFH12 hydraulic motor-driven, steel channel chain feed complete with the power centralizer, manual inclinator and hose reel
  • The HUFH12 feed will change a 3.66 m (12 ft) drill steel inside the centralizer
  • Model HUFH20 hydraulic motor-driven steel channel chain feed complete with the power centralizer, manual inclinator and hose reel
  • The HUFH20 feed will change a 6.10 m (20 ft) drill steel inside the centralizer
  • Model HPR5128 hydraulic powered percussion drill with hydraulic motor powered variable speed rotation
  • Pressurized swing cab complete with heater, air conditioner, wipers, two (2) drilling lights and all necessary drilling controls
  • Electronic two-axis angle indicator
  • AM/FM stereo with CD player and seat belt
  • Linear rod changer for five (5) 3.66 m (12 ft), 51 mm round, 51 series rods for up to 21.9 m (72 ft) drill steel capacity
  • Linear rod changer for four (4) 6.10 m (20 ft), 51 mm round, 51 series rods for up to a 30.48 m (100 ft) drill steel capacity
  • Multiple element, hydraulic motor powered, dry dust collecting system complete with feed mounted precleaner and power pick up pot
  • The drill, feed, blowing air, tram and boom controls are mounted in the cab
  • A second set of tram and boom controls are mounted at the operator stand
  • Power coupling greaser
  • Complete sheet metal enclosure
  • Collaring circuit

Optional Equipment

HPR6030 Rock Drill and rod rack for 60 mm drill steel
HPR6832 Rock Drill and four (4) pot linear rod rack for 68 mm drill steel
Rear-mounted 303 L (80 gal) detergent system
Automatic Rock Drill greaser
FOPS structure on cab
Rod changer conversion kit 51 mm (5 rod) to 60 mm (4 rod)
Rod changer conversion kit 60 mm (4 rod) to 51 mm (5 rod)
Rear hydraulic stabilizer
Less dust collector and precleaner



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