Diedrich D-120 Truck

Heavy-duty drill rig for soil and rock exploration. Rated to depths of 200ft. to 350ft. with augers and 2000ft. with core drilling.

Performance ratings are based on engineering specifications, calculations and accepted industry standards. Capacities may vary according to drilling conditions. Diedrich Drill reserves the right to amend these specifications at any time, without notice

D-120 Specifications

Heavy duty drill rig for soil and rock exploration using augers, rotary tools or core drilling tools.Rated to depths of 200 ft.(61 m) to 350 ft. (107 m) with hollow stem or continuous flight augers up to 19 inch (483 mm) hole size.Rated to 2000 linear feet (610m) of core drilling using NW series tools.

The drill is powered by a 4-cylinder turbo-charged diesel.* Electric starting and engine instruments are standard

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

Clutch – 13 inch (330mm) automotive type.Transmission – Heavy duty helical gear transmission with 5 forward and 1 reverse speed.Optional Cathead is driven by a power-take-off  providing 1 speed forward and 1 reverse.

The right angle drive is a heavy-duty spiral bevel gearbox, totally enclosed, and running in oil.

The drill head utilizes a 2 speed all gear drive with 8620 heat treated gears. Tapered roller bearings, running in SAE 90W gear oil, are used. A chuck is available(optional) for all standard size rods and casing.

Spindle Bore…..3-1/2” (89mm)
Spindle travel….68” (1727mm)   
                         up 32,515lbs (145kN)     @2300psi
                         down 18,064lbs (80kN)    @2300psi
Max feed rate….up FPM 41 (13m/min)
                         down FPM 74 (23m/min)
                         up regenerative FPM 64 (20m/min)
Max gross spindle torque*
Standard Transmission  HighTorqueTransmission
Low   8,094ft.lbs(10,974Nm)       9,322ft.lbs(12,639Nm)
High 20,063ft.lbs(27,202Nm)      23,105ft.lbs(31,326Nm)
Max Spindle speed.*                          1st gear, low range – 37RPM
                          5th gear, high range – 736 RPM
* varies with engine choice

Oil is supplied by a heavy-duty 2-section gear type pump rated at 20 GPM(76l.min) and 28 GPM(106l/min). Maximum operating pressure is 2300 PSI(15513k Pa). The pump is driven by a drive shaft connected to the front of the engine or from the engine auxiliary drive.Hydraulic valves are stock sectional body directional control vavles with an integral non-adjustable relief valve.An optional regenerative spool can be provided for the main feed valve providing a high speed spindle lift as well as normal operation.

A heavy universal joint, which mounts to the spindle with a single nut, is provided for ease in hook-up and adjusting for misalignment. All components are sized to withstand severe combinations of torque and axial load. 6-1.4″(159mm) I.D. hex box is standard, other sizes available