Central Mine Equipment Company

- Model CME-550X - Rubber Tire ATV Mounted Drill



Ground bearing pressure of the CME-550X is only 9 psi [.632 kgf/cm2] to 11 psi [.773 kgf/cm2], depending on tools on board. Compare that to 35 psi [2.45 kgf/cm2] to 50 psi [3.5 kgf/cm2] ground bearing pressure of a truck-mounted drill. This high flotation lets you negotiate mud, snow, sand, and rocks…. all with less damage to the terrain. That can be extremely important in environmentally sensitive areas such as parks, farms or golf courses.

This high flotation lets you negotiate mud, snow, sand, and rocks…. all with less damage to the terrain. That can be extremely important in environmentally sensitive areas such as parks, farms or golf courses.

Low center of gravity and high ground clearance.

In order to keep the center of gravity as low as possible, we mounted the drill to the carrier frame, in between the tires. We also mounted the two water tanks underneath the deck for even more stability. Their combined capacity is 160 gallons [605.7 L].

The underside of the CME-550X is protected by a steel belly pan with 22 inches [55 cm] of ground clearance.

Planentary front and rear axles with no-spin differentials and aggressive all-terrain tires…the ultimate combination for off-road traction.

Planetary axles put the gear reduction at the wheels. That means less stress on other drive train components; and no spin differentials give you true 4-wheel pulling power.

Even though the rear of the drill is heavier by design (for optimum drilling performance), front and rear ground pressure is equal, thanks to the wider tires in the rear.

The agressive lug design of the 16 ply mud and snow tires provides a deep, sharp bite in soft terrain; and the open-center tread pattern assures efficient self-cleaning action.

The front axle oscillates when traveling on uneven terrain allowing all four tires to remain on the ground for better traction and load distribution.

Hydraulic, wet disc type, service brakes are located at each wheel for maximum stopping power. Since they are enclosed inside the planetaries, they are not adversely affected by mud and water. An independent, mechanically applied, hydraulically released, disc parking brake on the drive line is also provided.

The CME-550X gives you the versatility to handle drilling jobs that are on Main Street.

The CME-550X’s rubber tires will not damage most paved surfaces. A front axle disconnect allows you to shift from 4-wheel to 2-wheel drive to prevent axle wind-up when driving on hard pavement.

Since the CME-550X is not over width, it is easily transported on a trailer any time of the day or week without special permits.

Single engine provides big savings.

The CME-550X uses only one engine, a Cummins QSB 4.5L [275 cubic inch] 4 cylinder turbocharged and charge air cooled diesel, for both driving and drilling. That means big savings in your initial investment, as well as overall weight, space, and maintenance savings.

ROPS protection is standard.

A roll-over protective structure is standard on the CME-550X. It meets SAE specification J1040C.

Integral design gives you a completely self contained drilling unit with no compromises.

Since we designed the carrier ourselves as an integral part of the overall drill, we were able to utilize all space to the best advantage. The deck layout provides plenty of easily accessible storage area for augers, rods, and other drilling tools.

The 121 inch (307 cm) wheelbase accommodates 5 foot (1.5m) augers in a rack below deck, between the front and rear tires. Lockable tool boxes are provided on both sides of the drill. The CME-550X can carry everything you need to get the job done.

Hydraulic feed and retract system provides 28,275 pounds [12,826 kg] of retract force and 18,650 pounds [8,460 kg] of down pressure.

The hydraulic vertical drive system has no chains, which need lubrication, or cables, which can stretch. It gives you precise control of force on the drilling tools.

Retract rates up to 90 feet [27.4 m] per minute and feed rates of 55 feet [16.8 m] per minute let you add or remove drilling tools quickly.

The distance from the sheaves to the ground is 26 feet [7.9 m]. That means you can hoist 20 feet [6 m] of rods with clearance to spare. When equipped with three hoists, the CME-550X can pull 60 feet [18.3 m] of rods without having to lay any down on the ground or on the deck.

Dependable mechanical rotary drive provides 9,075 foot pounds [12,304 Nm] of rotary torque, plus high rotation speed when you need it.

You get the torque you need for auger drilling as well as rotation speed over 690 rpm for rotary or core drilling applications. Other optional rotation speed and torque combinations are also available, including a high-speed rotary drive that gives you spindle rotation speeds up to 920 rpm.

With 5 forward gears and one reverse, there is a rotation speed and torque combination for just about any situation, and since the transmission does not travel vertically with the spindle, you won’t find yourself unable to change gears when you’re at the top of the feed stroke.

Patented spindle brake stops rotation in an instant.

An emergency spindle brake stops rotation in less than one revolution. This system is activated by two conveniently located push button switches as well as by strategically located wobble switches.

Slide base makes the job easier and quicker.

The drill is mounted to the carrier on a hydraulically actuated sliding base. A 15 inch [38.1 cm] in-out movement allows you to quickly move the drill off the bore hole and align the sheaves for lifting tools with the cathead or any of the hoists.

A 4.0 inch [10.2 cm] sideways movement gives you even more versatility. Aligning augers or rods when making connections is easy, or if the bit drifts off at an angle when you start a hole, you can quickly straighten it to a vertical position.

If you have ever tried to line up your rig on an existing borehole, then you’ve probably recognized another benefit of the slide bases.

Patented angle drilling system

This unique system is especially effective for drilling underneath ponds, storage tanks, or other structures. When used with our patented Continuous Sample Tube System, you can take soil samples while drilling angle holes.

The angle drilling system will also allow you to drill vertically on an uphill slope. That can eliminate the time consuming job of leveling an area on which to place the rig.

And, since the kelly drive is directly connected to the right angle drive box, you can raise or lower the mast with the drivetrain already connected and ready to go.


  • Cummins QSB 4.5L [275 cubic inch] 110 Horsepower (82 kilowatt) 4-cylinder turbocharged and charge air cooled diesel engine. U.S. EPA Tier 3 emissions certified.


  • Tire size:
    • Front… single 45 inch tall x 23.6 inch wide 16-ply (600/50-22.5)
    • Rear…. single 45 inch tall x 28 inch wide 16-ply (710/40-22.5)
  • Ground Bearing pressure (without tools):
    • 9 psi [.632 kgf/cm2]
  • Transmission:
    • 5 speed forward, 1 speed reverse
  • Axles (front and rear):
    • planetary with no-spin differentials
  • Steering:
    • hydraulic power
  • Front winch:
    • Standard: 12,000 pound [5,443 kg]
    • Optional: 20,000 pound [9,071 kg]

Rotary drive

  • Standard:
    • Rotary torque: 9,075 foot pounds [12,304 Nm] max
    • Rotary speed: up to 690 rpm max
  • High torque (optional)
    • Rotary torque: 11,300 foot pounds [ 15,320 Nm] max
    • Rotary speed: up to 550 rpm max
  • High Speed (optional)
    • Rotary torque: 6,800 foot pounds [ 9,219 Nm] max
    • Rotary speed: up to 920 rpm max
  • Transmission:
    • 5 speed forward, 1 speed reverse
  • Clutch
    • Heavy duty 13 inch [33 cm]
  • Hollow spindle I.D.:
    • 2¾ inch [7 cm] ( 3¾ inch [9.5 cm] available)

Hydraulic feed system

  • Retract force
    • 28,275 pounds [12,826 kg]
  • Pulldown force
    • 18,650 pounds [8,460 kg]
  • Retract rate (max)
    • 35 feet [10.7 m] per minute
  • Rapid Retract rate (max)
    • 90 feet [27.4 m] per minute
  • Feed Rate (max)
    • 55 feet [16.8 m] per minute
  • Stroke
    • 72 inch [183 cm]

Leveling system

Three jacks, inverted design with chrome-plated piston rods enclosed at all times.

Hydraulic rod holder and breakout wrench

The hydraulic rod holder makes your job quicker and safer. It not only pivots from on-hole to off-hole positions, but also hydraulically moves in and out. For efficient operation, the breakout wrench is mounted at the pivot point of the rod holder arm.

Automatic hammer

Our 140 pound [63.5 kg] automatic hammer gives you extremely consistent and accurate Standard Penetration Test results, meeting all ASTM-D-1586 requirements. That’s because there are no ropes or cables to impede the free fall of the weight.

The hammer swings from stored position to on-hole position. Since raising and lowering is done hydraulically, set up is quick and almost effortless.

For maximum safety, all moving parts are enclosed, including the impact area between the weight and the anvil. A 340/140 pound [154/63.5 kg] hammer is also available.

Quick mast disconnect

This feature allows you to quickly disconnect the mast when working inside buildings, underneath bridges or in other low overhead drilling locations. Since the mast is completely separated from the upright, is doesn’t interfere with other drill functions such as the in-out slide base.

With the mast in the horizontal position, you simply clamp it to its storage rack and extend the drill’s in-out slide base. This pulls the sockets on the upright drill frame away from the large tapered pins on the mast.

Additional optional equipment

  • Continuous sample tube system
  • High torque rotary drive
  • Underside sheave
  • Low clearance sheave
  • Auger and rod guides for angle drilling
  • Fluted kelly and chuck assembly
  • Drill rod chuck
  • Spindle adapter
  • Utility air tool system
  • Cathead, 8 inch [20.3 cm] diameter
  • Hydraulic hoist
    • 1,800 pound [816 kg], max line speed 200 ft./min [61 m/min]
    • 3,200 pound [1,452 kg], max line speed 100 ft./min [30.5 m/min]
    • 7,000 pound [3,175 kg]
      • max line speed up: 85 ft./min [26 m/min]
      • max line speed up: 340 ft./min [104 m/min]
    • 8,500 pound [3,856 kg]
      • max line speed up: 72 ft./min [22 m/min]
      • max line speed up: 310 ft./min [94 m/min]
  • Hydraulic wireline hoist
    • 900 pound [408 kg], max line speed 400 ft./min [122 m/min]
    • 1,800 pound [816 kg], max line speed 200 ft./min [61 m/min]
  • Water pumps
    • Moyno Progressing cavity
      • 36 gpm/225 psi [136 lpm/1,551 kPa]
      • 84 gpm/225 psi [318 lpm/1,551 kPa]
    • FMC/Bean
      • 25 gpm/500 psi [ 95 lpm/3,448 kPa]
      • 35 gpm/500 psi [132 lpm/3,448 kPa]
    • Other pumps available

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