Smoother Roads Ahead

| August 02, 2001

Hendrickson developed its Hi-Torque shock absorber as part of the integrated Efficient Driveline Geometry (EDGE) system, designed to reduce suspension-related torsional driveline vibration and frame rise during hard braking and accelerating and while traveling over rough road surfaces. An internal rebound spring in the standard 1 3/4-inch bore shock absorber compresses on the extension stroke to resist the rapid extension related to axle windup. Since the compression stroke is not affected, ride is not adversely affected.

The EDGE system includes a zero-delay height control valve that operates within a small deadband – the range of vertical suspension movement in which the system does not react. The system provides faster response to road inputs and maintains the proper height under a wider range of operating conditions than long-delay valves, Hendrickson reports.

The company offers a retrofit height control valve kit that provides twice the airflow of comparably sized valves. That results in quicker response and faster exhaust of air. As a general rule, Hendrickson recommends against adjusting ride height to improve comfort. Changing the height from the factory setting risks inducing a driveline vibration, which can damage pinion bearings and U-joints.

The height control setting should be checked and adjusted after any repair is made to suspension components, Hendrickson says, observing that excessive driveline vibration is a sign that the ride height is incorrect. A high setting forces shock absorbers to travel to their full extension. A low setting results in an uncomfortable ride since the suspension can bump against the axle stop.

Smoother Roads Ahead

| August 02, 2001

Hendrickson developed its Hi-Torque shock absorber as part of the integrated Efficient Driveline Geometry (EDGE) system, designed to reduce suspension-related torsional driveline vibration and frame rise during hard braking and accelerating and while traveling over rough road surfaces. An internal rebound spring in the standard 1 3/4-inch bore shock absorber compresses on the extension stroke to resist the rapid extension related to axle windup. Since the compression stroke is not affected, ride is not adversely affected.

The EDGE system includes a zero-delay height control valve that operates within a small deadband – the range of vertical suspension movement in which the system does not react. The system provides faster response to road inputs and maintains the proper height under a wider range of operating conditions than long-delay valves, Hendrickson reports.

The company offers a retrofit height control valve kit that provides twice the airflow of comparably sized valves. That results in quicker response and faster exhaust of air. As a general rule, Hendrickson recommends against adjusting ride height to improve comfort. Changing the height from the factory setting risks inducing a driveline vibration, which can damage pinion bearings and U-joints.

The height control setting should be checked and adjusted after any repair is made to suspension components, Hendrickson says, observing that excessive driveline vibration is a sign that the ride height is incorrect. A high setting forces shock absorbers to travel to their full extension. A low setting results in an uncomfortable ride since the suspension can bump against the axle stop.

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