Category Archives: GB1

Bent Brovold Lift Screw?

Did you bend the lift screw on your AFGB1?  Take heart.  You’re not alone. A Common Problem on AFGB1’s:  Bent Lift Screws The Pine AFGB1 is designed with a screw system to lift the gyratory head off the compaction chamber and rotate it out of the way.  Unfortunately, the lift screw that forms the cornerstone…

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The AFGB1 and Angle of Gyration Explained

“What does the angle information on my AFGB1 calibration sticker tell me?  This is confusing!” Sound like you?  Keep reading.  This article is an attempt to bring some clarity to subject.  Angle of Gyration Defined AASHTO T344 provides the following definitions (See Figure 2), Section 3.1.  external angle – the angle formed between the external…

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Clean Your AFGB1’s Compaction Chamber

“I’m told I need to keep the compaction chamber of my AFGB1 free of asphalt.  It’s a real pain digging the asphalt out of the bottom of the chamber.  Is it really such a big deal?” Yes, keeping the bottom of your AFGB1 compaction chamber free of asphalt is important.  Frequently, our field service technicians…

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Clean and Lubricate the Spherical Seat on Your AFGB1

“I hate cleaning my machine!  It’s such a dirty job.  And, it doesn’t make a difference anyways, does it?” Does it?  Actually, it does make a difference.  Keeping your gyratory compactor clean and free of debris will reduce wear and ensure maximum performance.  Let’s consider only one specific part of the AFGB1, the spherical seat….

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