Vibration Analysis - Driveline

Vibration Analysis - Driveline

Test Description

The numbers below refer to the step numbers in the diagnostic table.
8. First-order driveline related vibrations are usually caused by components that exhibit excessive runout or imbalance. Reproducing a vibration concern in the service stall can aid in pin-pointing the component which may be at fault. (A vibration concern may appear to be either less severe or more severe when duplicated in a service stall, than when duplicated on the road.)
9. First-order driveline related vibrations that could not be duplicated during the non-torque sensitive service stall test, could be caused by internal axle components. This test is designed to duplicated first-order driveline related vibrations that are sensitive to torque/load. A vibration concern may appear to be either less severe or more severe when duplicated in a service stall, than when duplicated on the road.
11. First-order driveline vibrations can be caused by excessive runout of a propeller shaft.
15. First-order driveline vibrations can be caused by excessive runout of the pinion flange. If a propeller shaft exhibits excessive runout at a pinion flange end only, the runout may actually be caused by the pinion flange.
17. Re-indexing a propeller shaft to a pinion flange can reduce the amount of total combined runout which the components produce, which may in-turn reduce a vibration.