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Technical BulletinRide Height Adjustment |
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The ride height of the air suspension axles should be set to the permitted range as given by BPW. With single axles a minimum upward travel of 60mm is necessary. With multi-axle bogies a minimum upward travel of 70mm is necessary. The inclination of the trailer must also not exceed ±1°, see Figure 1 |
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Figure 1 |
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Ride Height AdjustmentTo set the ride height the following steps must be taken: |
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Figure 2 |
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6. Loosen the pivot bolt |
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Figure 3 |
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8. The ride height is measured from the center of the axle beam to the bottom face of the chassis beam: |
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Photo 1 |
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9. The ride height is dependent on the type of suspension fitted, i.e. a. Hanger bracket size 10. Referring to Figure 4, loosen Nut 2 on the lever arm and adjust Nut 1 to change the ride height. |
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Figure 4 |
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11. If more ride height adjustment is needed, the length of the guide rod (see Figure 3) must be adjusted. |
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ECAS – Electronic Controlled Air Suspension.In addition to the conventionally operated air suspension valves, electronic controlled air suspensions or ECAS are also used on vehicles, see Photo 2. The sensor is usually connected to the brake system which also controls the valve functions. With ECAS, the ride height cannot be set manually and software is needed to do the adjustments. |
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Photo 2 |
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Things to look out for1. Pivot linkage set-up. Ensure that the Pivot linkage is installed correctly. This will ensure correct operation |
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Figure 5 |
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