ZR77 blasthole drill

Blasthole Drills


  • Hole diameter: 7 7/8 - 10 5/8 in
  • Bit loading: 77,000 lbs.
  • Single pass hole depth: 55 ft.

Contact Account Manager

The reliability you need for the productivity you demand

When you need the lowest cost per meter drilled and blasted, Komatsu rotary drills deliver. Featuring rugged and reliable rotary carriages and enclosed boxer style masts, these machines provide ample torque and bit loading through the tough rock conditions. With maximum bit-loading ranges from 77,000 to 150,000 lbs. (68,039-34,927 kg) Komatsu offers a range of rotary drills for a variety of capacities and applications.

  • Increase drilling time as much as 12%
  • 77,000 lbs. of maximum bit-loading capacity
  • Improve availability by 2-5%
  • Reduce maintenance costs by 5-10%

Features and benefits

Robust, solid boxer-style mast construction

To help reduce maintenance time and increase structural reliability, we've engineered an innovative solid boxer style mast.

Intelligent compressor control

This smart feature allows the operator to regulate the amount of air into the hole and helps manage power and fuel consumption. Effectively manage associated bailing velocity as well, which can help lower operating costs.

Auto-bit handling

The innovative auto-bit carousel helps to reduce bit change downtime. This feature also helps to flex into a new hole diameter quickly so operators can seamlessly adapt the drill pattern to quickly reach optimal fragmentation.

Drill automation system with remote control operation

Increase drill utilization, helping to reduce operator inefficiencies and overdrilling. Single and multiunit high-precision GPS (HPGPS) remote control operation for effective control.

Auto navigation capability with high-precision GPS (HPGPS)

This feature increases the precision of hole locations within drill patterns to elevate productivity. It also allows the movement of the drill between holes without the operator inside the cab.

Single and multipass angle drilling

The versatility to allow operators to perform multiple functions with a single drill rig with automatic mast positioning and adaptive auto-leveling.

Working Ranges

Hole diameter 200 mm to 270 mm 7 7/8 in. to 10 5/8 in.
Maximum single pass 16.8 m 55 ft.
Maximum multi-pass 85 m 280 ft.
Maximum bit loading 34,925 kg 77,000 lbs.

Overall Dimensions

Width, overall 5.43 m 17 ft. 10 in.
Height, mast up 24.5 m 80 ft. 5 in.
Height, mast down 7.0 m 23 ft. 0 in.
Length, mast up 13.1 m 43 ft. 0 in.
Length, mast down 24 m 78 ft. 9 in.
Overall width of crawlers 4.12 m 13 ft. 6 in.
Overall length of crawlers 7.02 m 23 ft. 0 in.
Width of non-drill end jacks 1.4 m 4 ft. 7 in.
Width of drill jacks 2.85 m 9 ft. 4 in.
Length between jacks 7.14 m 23 ft. 5 in.
Height to top of operators cab 4.36 m 14 ft. 4 in.

Operators cab

  • Window shades
  • Walk-around cab access
  • Microwave
  • Storage locker
  • AM/FM/WB/USB/iPad/iPhone/Satellite radio
  • DIN EN 15695 level cab filtration


  • Centralized fluid drains
  • Preheat system (auto lube)
  • Extended maintenance interval filtration
  • Bit lubrication

Drill deck

  • Boarding ramp (main access only)
  • Auxiliary power unit (APU)
  • Preheat system (for APU)
  • Radio remote control (propel and leveling)
  • Mast access platform
  • Cold weather package
  • Tool kit, drilling tools
  • Storage locker/job box
  • Machinery area enclosure
  • Engine cover, rain guard
  • Additional sound suppression
  • Pressure washer
  • Deck crane option

Drill automation

  • High precision GPS navigation
  • Single-machine tele-remote control
  • Auto hole-to-hole navigation
  • Obstacle detection and mitigation
  • Hawkeye 360º camera system
  • Auto pipe changing
  • Auto mast positioning
  • Auto dust suppression
  • Adaptive auto level
  • Enhanced auto drill