Steering System-General Information: Specifications Jaguar XKR I

Specifications

STEERING LINKAGE SPECIFICATIONS

POWER STEERING PUMP SPECIFICATIONS

LUBRICANTS, FLUIDS, SEALERS AND ADHESIVES SPECIFICATIONS

Scheme 1

1. Fill the reservoir to the bottom of the filler neck. Wait for any air to escape and top up again. Without the engine running, turn from lock to lock two or three times, topping up to the maximum level on the dip reservoir stick. Start the engine and immediately top up as air is vented. With the engine idling, turn lock to lock two or three times, topping up to the maximum level on the reservoir dip stick. When no further change of fluid level occurs, run the engine for twenty minutes to vent any remaining air. NOTE: Air in the fluid can temporarily result in PAS pump noise, but this will not cause damage. The time allowances mentioned in the above procedures are to reduce the possibility of a customer collecting a vehicle while still subject to excessive pump noise. If possible, allow the vehicle to stand for thirty minutes before restarting the engine to vent any further air. (Scheme 1): Removing Reservoir Cap

Torque Ripple

Torque ripple is a concern with Electric Power Steering (EPS) systems. Torque ripple is most evident at static-park steering the wheel very slowly from lock to lock. Torque ripple is primarily caused by motor commutation.

Torque/Velocity Variation (Phasing/Effort Cycling)

Steering wheel torque variation occurring twice in one revolution is normally as a result of problems with the lower steering column (intermediate shaft), but foul conditions generally result in either constant stiffness or single point stiffness. Depending upon the orientation of the joints, the steering can feel asymmetric (torque falling off in one direction and rising in the other) or else it can simply have pronounced peaks and troughs as the steering moves from lock to lock.