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Suspension System Inspection
Note:
Do not adjust air suspension height to any setting other than the specified setting. Altering the height setting changes the driveline angle and may result in unwarrantable component damage, such as transmission component damage.
Verify drive axle air suspension height and height control valve performance at engine oil change intervals.
Periodically check:- Condition of spring leaves for evidence of fatigue, bending or breakage.
- Condition of suspension mounting brackets and bushings.
- Torque rod mounting fasteners for tightness.
- For proper suspension alignment. Maintain proper alignment at all times.
- U-bolts. After the chassis has been operating under load for 1,000 mi (1,600 km) or six months (whichever comes first), the U-bolt nuts must be re-torqued. Re-torque the U-bolt nuts every 37,000 mi (60,000 km) thereafter. Clean and lubricate the U-bolt and nut threads and seats to make sure a like new condition when re-torqueing. See Spring U-Bolt Check .
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