Drills Buyer Guide

• Typical used pricing ranges from $65,000 for compact utility HDDs up to $1,250,000+ for late-model production blast hole or large rotary foundation rigs.
• Operating weights vary dramatically, from 8,000 lbs for compact urban directional drills to over 160,000 lbs for high-capacity foundation and quarry rigs.
• Engine life typically reaches 10,000 to 14,000 hours, but rotary heads, mud pumps, and hammer systems often require rebuilds every 2,500 to 4,500 hours.
• Fuel consumption ranges from 4 to 8 gallons per hour on mid-size HDDs to 25+ gallons per hour on high-pressure compressor-equipped blast hole rigs under 100% duty cycle.
• Standard tooling includes drill rod strings, rock reamers, down-the-hole (DTH) percussion hammers, augers, casing drivers, and bentonite mud mixing systems.
• Primary applications include telecommunications conduit boring, water and gas line installation, surface quarry production, and bridge or high-rise caisson foundations.

• 1Inspect the mast and guide rails for structural cracking, warping, and excessive slide-pad wear, especially around pivot pins and lower boom mounts.
• 2Examine the rotary drive gearbox and motor seals for gear backlash, radial play, case cracks, and high-temperature hydraulic weeping.
• 3Check feed system components—inspect feed chains, wire ropes, sheaves, and hydraulic drive cylinders for elongation, fraying, and tensioner cylinder leaks.
• 4Evaluate undercarriage wear on crawler units, focusing heavily on track link height, sprockets, and bottom rollers, which sustain intense vibration and torque loads.
• 5Test the hydraulic system under full relief pressure; check for thermal degradation, pump cavitation, and valve body bypass on thrust, pull-back, and rotation circuits.
• 6On blast hole units, inspect the onboard air compressor for separator element contamination, discharge temperature faults, and oil blow-by.
• 7For HDD units, check the fluid end and power end of the high-pressure triplex bentonite mud pump for scored ceramic liners, blown packing, and valve seat pitting.
• 8Review automated rod-handling carousels or grippers for worn jaws, bent indexer arms, misalignment, and damaged proximity sensors.
• 9Compare engine ECM operational hours against drill/rotation hours and hammer strike hours; a disproportionately high idle-to-drill ratio indicates jobsite inefficiencies or hidden usage.
• 10Pull telematics and onboard diagnostic event logs to search for historic hydraulic over-pressure spikes, high engine coolant temperatures, and compressor shutdown codes.

Commonly-reported issues from operators and technicians. Every machine varies — always inspect before you buy.