• Mon - FRI 7:00am - 5:00pm
  • 5 fisher street laporte, in 46350
  • 800-348-8809



Power Source 4 Cylinder 115HP (Tier 4)
Horsepower 115 HP
Max Spindle Torque 8,800 ft-lbs
Spindle Bore 3.5" (89 mm)
Push & Retract Force Down: 14,453 lbs (64 kN), Up: 22,581 lbs (100 kN)
Rotary Box 80 Triple Stranded Roller Chain
Clutch 12-1/4" Clutch
Transmission Helical Gear Transmission with 5 forward and 1 Reverse
Drilling Type All Purpose

All-purpose drill rig for soil and rock explorations using augers, rotary tools, or core drilling tools. The new and improved 2024 and newer D-50 models now have a max output speed of 790 rpm and a 5 speed transmission while achieving 8,800 ft-lb of torque.

Rated from 125 ft. (38m) to 250 ft. (76 m) depth with hollow stem or continuous flight augers up to 14” (356 mm) hole size.

Rated to 1000 linear feet (305 m) of core drilling using N series tools.


  • Mast (Several Sizes Available)
  • Cathead
  • Hydraulic Hoists
  • Slide Base (In/Out)
  • Low Overhead Clearance Feed Frame
  • Side Slide Base
  • Leveling Jacks
  • Drill Platform
  • Water Tank
  • Rod Rack
  • Auger Rack
  • Tool Boxes
  • Drillers Step
  • Hydraulic Chuck
  • Water Pump
  • High Rise Pump Mount
  • Hydraulic Rod Holder & Breakout Wrench
  • 140lb. Automatic SPT Hammer System

All-purpose drill rig for soil and rock explorations using augers, rotary tools, or core drilling tools. The new and improved 2024 and newer D-50 models now have a max output speed of 790 rpm and a 5 speed transmission while achieving 8,800 ft-lb of torque.

Rated from 125 ft. (38m) to 250 ft. (76 m) depth with hollow stem or continuous flight augers up to 14” (356 mm) hole size.

Rated to 1000 linear feet (305 m) of core drilling using N series tools.

Frame & Base

The drill frame is a weldment, constructed of heavy wall rectangular steel tubing, with sufficient strength and rigidity for heavy duty use.

Power Unit

The D-50 unit is powered by a 115 HP, 4-cylinder turbo charged Tier 4 diesel engine.

Clutch & Transmission

Hydraulic Clutch – 12-1/4″ inch automotive type.

Transmission – Heavy duty helical gear transmission with 5 – forward and 1 – reverse gears.

Optional Cathead is driven hydraulically on 2023 and newer drill rigs.

Right Angle Drive

The right angle drive is a heavy-duty Diedrich designed gearbox.

Rotary Box

The rotary box consists of a #80 triple-strand roller chain drive running in gear oil.  The quill and spindle are supported on tapered roller bearings.  The lower bearings run submerged in oil.  The upper bearings are externally greased.

  • Spindle Bore: 3-1/2″ (89mm)
  • Spindle Travel: 70″(1778mm)
  • Thrust @ 2300 PSI:
    • UP: 22,581 lbs. (100kN)
    • DOWN: 14,453 lbs. (64kN)
  • Max Feed Rate:
    • UP FPM 49 (15m/min)
    • DOWN FPM 76 (23m/min)
    • Up Rapid Retract 70 FPM (21 m/min)
  • Max Gross Spindle Torque :
    • 1st Gear: Up to 8,800 ft-lb (11,931 Nm)
  • Max Spindle Speed:
    • 1st gear: 95 RPM
    • 4th gear: 790 RPM
Hydraulic System

On the D-50 unit, oil is supplied by a heavy-duty gear type two-section pump rated at 19 GPM (72 L/min) and 24 GPM (91 L/min) at 2400 RPM.  Maximum operating pressure is 2300 PSI (15,513 k Pa).  The pump is gear driven from the engine accessory drive.

Hydraulic valves are stock sectional body directional control valves with relief.  All controls are conveniently located on a single console for ease of operation.

Auger Adapter

A heavy duty universal joint is provided for ease in hook-up and adjusting for misalignment.  All components are sized to withstand torque and axial loads encountered under most drilling conditions. 2” (50.8 mm) female hex is standard, other sizes are available.


The mast is available in 3 standard lengths for 21ft, and 24ft, and 29ft 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 all lengths. Sheaves are provided for 1″(25.4mm) manilla cathead 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 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.

Hydraulic Hoist

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.

Slide Base

A hydraulically operated sliding base provides 16 in(406mm) of travel to provide clearance for hoisting tools. The sliding base can be mounted on any flat surface of adequate size.

Leveling Jacks

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)

Trailer Assembly

Double axle trailers are available for transporting and drilling with the rig. Steel ramps are provided for removing the rig from the trailer.

Water Tank

Track rigs have an optional 120 gallon (454 l) water tank while truck rigs have optional 250 gallon (946 l) or 500 gallon (1892 l) welded steel water tanks which mount at the front of the drill platform. Poly tanks are available on request.

Drill Platform

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

Standard D-50 truck lengths are a 125″ cab to axle measurement and we can build them on an under CDL required truck (25,999 gvw). Contact us for more information on truck dimensional requirements.

Rod Rack

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

Auger Rack

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

Tool Boxes

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

Water Pump

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

  • FMC Bean Pump
  • Monyo 3L6 or 3L8
  • SPX30 or 40 Hose Pump

Feed Frame Sheave Mount

The feed frame sheave mount bolts to the top of the feed frame to allow use of the cathead and winch when drilling with the mast horizontal. This permits drilling in 10 ft (3m) overhead clearances with a skid mounted rig. The feed frame sheeve mount can only be used with low overhead clearance feed frame.


The drill can be mounted on a steel skid platform. The arms of the skid are removable for ease of drilling and maneuverability. Contact us for more information regarding skid rigs.

Towing Rack

Skid rigs are available with an integrated winch mounted to the front of the frame. This allows for self-maneuvering the rig using an anchor point.

Side Shifting Base

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

Drillers Step

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

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

High Rise Pump Mount

Allows the Moyno 3L6 water pump to be mounted above two (2) 36″(915mm) tool boxes on the drill platform if requested.

Standard 3L6 applications do not require this high rise frame.

A toolbox high rise is used when a 3L8 pump is mounted to the platform.

Hydraulic Rod Holder & Breakout Wrench

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.

140lb. Automatic SPT Hammer System

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.


Diedrich Drill D-50 Drill Rig

Truck Mounted

Diedrich Drill D-50 Drill Rig

Track Mounted

Diedrich Drill D-50 Drill Rig


Diedrich Drill D-50 Drill Rig

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