This 1984 Challenger SDR321 320 is a used vertical drill — sometimes referred to as a drill rig — designed for rotary drilling operations. Vertical drills of this type are used across a range of applications including water well drilling, geotechnical investigation, and resource exploration. Challenger is a recognised manufacturer of heavy drilling equipment serving these industries, and this unit represents a substantial, truck-mounted rig configuration.
The rig is powered by a Detroit Series 60 14.0L D-Deck VI diesel engine, a well-regarded inline six-cylinder powerplant known for its durability in demanding field applications. Drive is handled through an Allison 5860 transmission paired with a transfer case, providing the power management needed for drawworks and auxiliary operations. The drawworks are direct-drive and grooved for 7/8-inch line.
The mast is a 64-foot, single section, three-stand racking mast rated at 150,000 pounds static hook load, equipped with a crown block, racking board, and a 4-inch standpipe. LED lighting is fitted to the mast. A short rotary drive box is included. Hydraulic controls manage the rig's primary functions, and four hydraulic jacks provide the levelling and stabilisation needed on site. A Pullmaster PL-8 hydraulic utility hoist is also fitted, offering an independent hydraulic winch for auxiliary lifting tasks.
The entire rig is mounted on a Challenger three-axle trailer with an overall length of 52 feet, giving the unit full road mobility between sites. Folding walkways are incorporated into the structure for safe platform access. Running gear consists of 11.00Rx20 tires. The unit underwent a Level 4 inspection in 2018. It is currently located in Utah, USA, and is offered at $345,000.
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