ATRO offers a full line of long-lasting polyurethane replacement parts for the Hendrickson RT suspension systems. We made this video to show you key points in identifying these suspensions, along with details for maintenance, and specs for ATRO parts.

The Hendrickson walking beam suspensions have been the industry standard for heavy-duty vocational trucks for over 85 years. This suspension incorporates two walking beams, officially called equalizing beams, on each side of the truck that pivot on center bushings. A cross tube rides between the two center bushings. It connects the beams and restricts side movement of the axles during turns. An end plug is welded on the outboard end of the center bushings to contain the cross tube. At opposite ends of the Walking Beam, the original designs incorporate two end bushings with an adapter kit riding through them that attach the beams to the axles.

The end adapter design was replaced in the early 1990’s with the bar pin end bushing, which bolts directly to the axle, eliminating the need for the adapter. The superiority of ATRO's polyurethane over rubber is only part of the ATRO difference. With ATRO's free-rotating bushings in the end beams, the bushing windup experience in rubber bushings is eliminated, resulting in longer life, reduced stress on other components, and overall improved suspension performance.

ATRO's center bushings do require the use of thrust washers. If there is any gap of more than 1/8" between the saddle and the center bushing, it must be filled with thrust washers. These are necessary because ATRO's center is not bonded to the inner pin. During turns, misalignment occurs within the bushing by allowing the inner sleeve to slip laterally. This allows for the same three-inch walk a rubber bushing allows, except that it's not at the expense of the polyurethane. The RT features a spring pack, which sits atop the beams to absorb road shock and provide stability.

Hendrickson suspensions can be specified for most OE makes, so the variation and torque rod lengths is extensive. ATRO has options for all lengths, including two-piece welded rods, complete rod replacement, or torque rod bushing replacement. An important note, do not mix ATRO with rubber. It is acceptable to mix ATRO bar pin end bushings with OE bronze centers. However, bronze centers require grease, while ATRO's do not.

ATRO WEBSITE LINKS
Use the links below to learn more about ATRO products.
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ATRO Suspension Schematics and Suspension Parts Lists:
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ATRO Torque Rod Finder / Quickly Find the Rod That’s Right for You:
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ATRO Field Manual / Suspensions:
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ATRO Support Documents:
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