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    1. Underground Construction
    2. Directional Boring Equipment

    Straightline 3550

    Sept. 28, 2010

    The Straightline HDD range includes three models, the largest of which is the 3550. This machine features 35,000 pounds of thrust/pullback force and a rotational-torque rating of 5,500 pounds-feet that can be sustained to speeds of 120 rpm. Rotational force is provided by a hydraulic vane motor which, says the company, "delivers unmatched start-up torque and efficiency." A 155-hp John Deere engine drives the 3550, and the machine holds 500 feet of drill pipe onboard and incorporates heavy-duty open-top wrenches.

    Walt Moore, Senior Editor

    The Straightline HDD range includes three models, the largest of which is the 3550. This machine features 35,000 pounds of thrust/pullback force and a rotational-torque rating of 5,500 pounds-feet that can be sustained to speeds of 120 rpm. Rotational force is provided by a hydraulic vane motor which, says the company, "delivers unmatched start-up torque and efficiency." A 155-hp John Deere engine drives the 3550, and the machine holds 500 feet of drill pipe onboard and incorporates heavy-duty open-top wrenches.