What to Watch for When Buying a Used Drilling Rig?

Short answer: On a drilling rig, the type (water well, foundation/bored pile, blast hole) must match your job; then the mast straightness, the rotary head (torque and bearing health), the rod/pipe system and the air compressor/mud pump are checked. These machines are niche; the difficulty of finding spare parts and operators is part of the purchase decision.

This guide answers: Which type of drilling rig is needed? · How is the rotary head checked? · What is the spare-part risk? · How is the mast/feed tested?

Mast and feed system

Bending and weld marks on the mast show transport damage; the feed cylinder/chain should be smooth — stiffness spoils drilling precision.

Rotary head and rods

Rotation torque, bearing noise and wear on the rod-connection threads are checked. Overhauling the head is expensive.

Compressor/pump and undercarriage

Is the air pressure (for blast holes) or mud-pump flow (for wells) sufficient? Leaks and traction in the tracked undercarriage are checked.

Frequently asked questions

Which type of drilling rig is needed? Water well, foundation/bored pile, and mining/blast are different machine classes; buying without clarifying your job is risky.

Is there a spare-part risk? Yes; on a niche machine, sourcing compatible rods and head parts is as important as the price.

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Last updated: 07.07.2026 · Based on field practice and platform data; it does not replace a technical inspection.