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FAQs - Hole-Hog® Underground Piercing Tools

The following FAQs apply to our Hole Hog® underground piercing tool series of products. For other categories, please click here.

  1. How can I identify which Allied Hole Hog I have?
    The Hole Hogs can be identified by their outer dimension and serial number.

  2. Do I need to lubricate my Hole Hog?
    Yes, Hole Hog lubrication is essential to reduce wear and prohibit the icing factor associated with pneumatic devices.  Allied Hog Wash is the recommended lubricant for all Hole Hog models.  Automatic, adjustable lubricant dispensers are also available from Allied.  Please see the related Hole Hog lubrication guidelines for additional information.

  3. Will my Hole-Hog hit harder or faster if operated above the recommended air pressure?
    No. Additional air pressure will actually slow the Hole-Hog. Internal mechanisms of the Hole-Hog operate via a precision fit of components.  Exaggerated operating pressures promote internal leakages that will reduce performance.  View troubleshooting chart (PDF).

  4. Why does my Hole-Hog slow down or stop after a short run time?
    The Hole Hog is operated via compressed air.  As compressed air is released and allowed to expand, it rapidly cools.  If the moisture content of the compressed air is high, this cooling effect can lead to icing of the internal Hole-Hog components.  This condition can occur even when ambient temperatures are well above freezing.  In this situation the temperature of the soil surrounding the Hole-Hog is usually sufficient to thaw the ice accumulated in the internal components in approximately 15 minutes of inactivity.  Regular lubrication with water dispersants such as Allied Hog Wash and daily draining of the air tank will minimize the chance of icing within the Hole-Hog during operation.  View troubleshooting chart (PDF).

  5. How can I restart a Hole-Hog that has stopped underground?
    To start a Hole-Hog that has stopped underground, disconnect the supply hose at the closest proximity to the Hole-Hog and kink the hose where it just disappears into the underground bore.  Next, have a helper inject a small quantity (2 to 3 oz.) of Allied Hog Wash™ into the open end of the supply hose and elevate the hose so that the Hog Wash will puddle or collect at the kink in the hose. Keeping the hose kinked, have the helper reconnect the supply line and turn on the air source.  With the supply line under pressure, quickly release the kink in the hose to allow the collected lubricant to flow rapidly against the internal Hole-Hog components.  This sudden injection of Hog Wash will usually restart the Hole-Hog. If a second attempt is required, allow the compressed air to flush all lubricant out of the Hole-Hog for at least a two-minute period before injecting more Hog Wash.

  6. Why does my Hole-Hog rise as it spans the bore?
    The Hole-Hog requires a minimum 3’ of dirt between the grade line and the depth of the bore to be made.  Because the depth of material below the bore is usually indefinite, the path of least resistance will generally be above the bore.  Compensate for the natural tendency to rise by angling the Hole-Hog one half of a bubble downward (as measured with a spirit level) off plumb for every 25’ of bore to be produced.


Updated: 5/5/2003 10:22:56 AM
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Equipment descriptions and specifications are subject to change without notice.


Allied Construction Products, LLC • 3900 Kelley Avenue, Cleveland, Ohio 44114 • Tel: (216) 431-2600 Fax: (216) 431-2601