ÖÁ×ðµç×Ó

Digger derricks play a crucial role for electric utility line crews. ÖÁ×ðµç×Ó digger derricks dig holes, set poles, and lift the needed material to get the job done. Sometimes a reminder of the basics is all it takes to continue operating the equipment as efficiently and in as safe a manner as possible. 

Don’t forget about the Operator’s Manual 

The operator’s manual is designed to provide the instructions needed to properly operate a digger derrick. The operator’s manual must be read and understood prior to operating the equipment. The manual also contains warning and consequences of improper operation. The manual only instructs on proper operation of the digger derrick, it does not teach you how to accomplish the task assigned by your employers. Contact the OEM if there is something missing or not clear in the operator’s manual. 

Before you Dig 

Before digging locate all overhead lines and all underground utilities. Call 811 if available in your area, or your state or province “Call before you dig” number. More information is available at www.call811.com. All underground utilities such as power lines, oil and gas lines, communication lines, waterlines, and sewer lines must be marked before digging. In addition, observe surroundings prior to operating and find any potential interference to boom and tail swing getting to and working the job. Be aware of trees, buildings, and other obstructions in the boom’s path. 

Set Up in the Right Spot 

Position the vehicle so the desired hole location is not at the fully retracted or fully extended position of the second boom. To maintain a vertical hole the extension will change as the boom is lowered during digging. 

Before unstowing the auger, make sure the boom is elevated above 45 degrees and all personnel are clear of the auger path.  Inspect all fasteners of the auger to the boom. After the auger has been unstowed, position the auger point on stake location by using the second section extension and rotation movement of the boom to set the point of the auger firmly on the ground. The digger moves in and out with the hydraulic extension when it is in the lowered position and has been latched to the second section. 

Digging Holes on an Incline 

If the vehicle is operated on sloping ground, use extreme caution when rotating toward the low side. The load chart on the unit gives the capacity when properly stabilized on level ground. The capacity is reduced if the vehicle is not level. 

When starting to dig on inclines, angle the digger/auger to the point where the auger head is perpendicular to the incline. Turn the auger several revolutions before starting a gradual return of the digger to a vertical position. 

An alternate method of digging on an incline is to level the digging area with a shovel before setting the auger. 

Spinning Dirt Off the Auger 

Under “heavy” soil conditions, the auger tends to corkscrew rather than dig. Regulate the down pressure of the boom to avoid this. Meter the down speed to keep the dirt “churning” and continue lifting as the auger turns. Keep auger vertical by metering the second section extension and boom rotation controls. If operator has difficulty determining if the hole is vertical, have a ground person direct the movement. Move in or out to keep the hole vertical. 

Deep Holes 

The pole height and ground conditions will determine the required depth of the hole.  If deeper holes are needed re-pin the auger on the Kelly bar as needed.  Re-pin at shortest length and inspect all fasteners before stowing. 

Back to the Operator Manual 

These are just a few tips to follow when using a digger derrick at the job site. It’s very important to read, understand and follow the instructions provided in the operator’s manual and any other manuals supplied with your vehicle. And finally – always comply with OSHA, federal, state, ANSI, local and your company regulations.