Holiday Navigator 2003 Owner's Manual page 457

Phasing is relatively simple on a two-joint set, be sure that the slip yoke
lugs and the tube yoke lugs are in line.
The U-Joint working angle is the angle formed by the intersection of the
driveshaft centerline and the extended centerline of the shaft of any component
to which the U-joint connects. Because the double oscillating motion of a
U-joint that connects angled shafts causes a fluctuating speed difference
between the shafts, the effect created by the U-joint at one end of the shaft
must cancel the effect created by the U-joint at the other end. This is done by
making U-joint working angles at both ends of the driveshaft approximately
equal, with the U-joints in phase. If the yoke lugs at both ends of the shaft are
lying in the same plane (a plane which bisects the shaft lengthwise) the U-joints
will be in phase.
Any condition which allows excessive movement of a driveshaft will cause
driveline imbalance: loose end yoke nuts, loose U-joint bearing cap retaining
capscrews, worn U-joint trunnions, bearings and worn slip-joint splines.
Among the most common causes of U-joint and slip joint damage is lack of
lubrication.
To keep the motorhome operating smoothly and economically, the driveline
must be carefully checked and lubricated at regular intervals.
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Chassis Information
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090336
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