Jeep Cherokee 2000 Service Manual - page 44
Propeller shaft speed (rpm) is the main factor in
determining the maximum allowable operating angle.
As a guide to the maximum normal operating angles
refer to (Fig. 5).
DIAGNOSIS AND TESTING
VIBRATION
Tires that are out-of-round, or wheels that are
unbalanced, will cause a low frequency vibration.
Refer to Group 22, Tires and Wheels, for additional
information.
Brake drums that are unbalanced will cause a
harsh, low frequency vibration. Refer to Group 5,
Brakes, for additional information.
Driveline vibration can also result from loose or
damaged engine mounts. Refer to Group 9, Engines,
for additional information.
Propeller shaft vibration increases as the vehicle
speed is increased. A vibration that occurs within a
specific speed range is not usually caused by a pro-
peller shaft being unbalanced. Defective universal
joints, or an incorrect propeller shaft angle, are usu-
ally the cause of such a vibration.
DRIVELINE VIBRATION
Drive Condition
Possible Cause
Correction
Propeller Shaft Noise
1) Undercoating or other foreign
material on shaft.
1) Clean exterior of shaft and wash
with solvent.
2) Loose U-joint clamp screws.
2) Install new clamps and screws
and tighten to proper torque.
3) Loose or bent U-joint yoke or
excessive runout.
3) Install new yoke.
4) Incorrect driveline angularity.
4) Measure and correct driveline
angles.
5) Rear spring center bolt not in
seat.
5) Loosen spring u-bolts and seat
center bolt.
6) Worn U-joint bearings.
6) Install new U-joint.
7) Propeller shaft damaged or out
of balance.
7) Installl new propeller shaft.
8) Broken rear spring.
8) Install new rear spring.
9) Excessive runout or unbalanced
condition.
9) Re-index propeller shaft, test,
and evaluate.
10) Excessive drive pinion gear
shaft runout.
10) Re-index propeller shaft and
evaluate.
11) Excessive axle yoke deflection.
11) Inspect and replace yoke if
necessary.
12) Excessive transfer case runout.
12) Inspect and repair as necessary.
Universal Joint Noise
1) Loose U-joint clamp screws.
1) Install new clamps and screws
and tighten to proper torque.
2) Lack of lubrication.
2) Replace as U-joints as
necessary.
PROPELLER SHAFT
MAX. NORMAL
R.P.M.
OPERATING ANGLES
5000
3°
4500
3°
4000
4°
3500
5°
3000
5°
2500
7°
2000
8°
1500
11°
Fig. 5 Maximum Angles And Propeller Shaft Speed
3 - 4
PROPELLER SHAFTS
XJ
DESCRIPTION AND OPERATION (Continued)