Diedrich - Model D-120 -Drill Rig

The mast is available in 3 standard lengths for 21 ft, and 24 Ft, and 29 ft pulls. The maximum mast height is limited by the type of carrier. The mast is pivoted on the drill frame permitting operation of the drill with the mast horizontal. Quick disconnect is standard for both lengths. Sheaves are provided for 1″(25.4mm) manila rope, 3/8″(9.5mm) and 1/2″(12.7mm) wire rope. The sheaves are 8″(203mm) diameter to reduce fatigue in the wire rope.

The cathead is mechanically driven from the drill transmission. The PTO provides 1 speed forward and 1 reverse. Drum is 8″(203mm) diameter and 6″(152mm) long with generously sized flanges.

The newly improved 2023+ cathead winches are hydraulically driven. The drum can be spun both clockwise and counterclockwise. Drum is 6″ diameter and 6″(152mm) long with generously sized flanges.

• Line Pull : 5,000#(2270 kg) +
• Speed : 500 ft./min. (153m/min) +

The cathead is mounted to the right rear of the drill and is perpendicular to the long axis of the drill frame.

Various capacity options are available, Hydraulic hoists utilize a worm gear drive with a sealed case. Gears and tapered roller bearings run in oil. Housing and drum are designed to prevent fouling of the cable. The controls are mounted on the operators console. Hoists are provided with a safety brake to prevent roll-back.

A hydraulically operated sliding base provides 20 in(508mm) of travel to provide clearance for hoisting tools. The sliding base can be mounted on any flat surface of adequate size.

Hydraulically operated, side to side provides approximately 6″(152mm) of motion left and right of center.

Jacks are available for rear and front mounting. 4″(102mm) bore cylinders are enclosed within telescoping steel tubes for increased durability and stability. Each jack is provided with a pivoted foot pad with a non-slip surface. Standard stroke is 36″(915mm)

Dimensions vary with the truck and carrier size. Welded construction consists of structural steel and deck plates. Running lights are included.

D-120 truck lengths vary with chosen options. A standard requirement is a tandem axle truck for the application. Contact us for more information on truck dimensional requirements.

250 gallon (946 l) or 500 gallon (1892 l) welded steel water tanks mount at the front of the drill platform. Other tanks are available on request.

Above deck rod rack and underbody rod rack are standard with drill platform. Optional rod storage under the water tank is also available.

Above deck auger rack is standard with drill platform. Underbody fixed, hinged, or hydraulic auger racks are available.

Tool boxes are available for above or below deck mounting in several sizes.

Heavy duty drillers step can be mounted on the right and/or left side of the drill platform. The step folds up for storage.

Hydraulic chuck mounts to top of spindle with jaws available through 3-1/2″(89mm)

Pump is frame or deck mounted and driven from the rigs’ hydraulic system

• FMC L1122 (435) With Variable Speed
• Monyo 3L8 With Variable Speed
• SP50 Hose Pump With Variable Speed

Other water pumps available on request.

A fluted kelly is available for the HT option.

This device is capable of holding up to 8″(203mm) O.D. drill rods or casing. It slides on and off the hole and also moves side to side. The device stores easily under the rig. A hydraulic breakout wrench is provided.

The Diedrich automatic SPT hammer system hydraulically lifts a 140 lb.(63.5kg) drive weight and completely releases the weight for a 30 in.(762mm) free fall. The drive weight does not have a cable or rope attached that may impede its fall. The hammer can be operated at a rate of up to 46-48 blows per minute. The tolerance of the fall height is plus or minus 3/8 inch(9.5mm). The hammer mounts on the guide tube so that it can be hydraulically raised and lowered and easily moved to the on hole driving position. The hammer can also be operated while suspended from a winch cable. The hammer driving force is transmitted only to the anvil and rods and the hammer allows for up to 24 inches(610mm) of driving without movement of the hammer body. The drive weight, lifting mechanism, and anvil impact surface are enclosed to provide optimum safety.