Diagnosis And Testing Vibration; Brakes - Jeep cherokee 2000 Service Manual

3 - 4 PROPELLER SHAFTS
DESCRIPTION AND OPERATION (Continued)
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).
PROPELLER SHAFT
R.P.M.
5000
4500
4000
3500
3000
2500
2000
1500
Fig. 5 Maximum Angles And Propeller Shaft Speed
Drive Condition
Propeller Shaft Noise
Universal Joint Noise
MAX. NORMAL
OPERATING ANGLES
3°
3°
4°
5°
5°
7°
8°
11°
DRIVELINE VIBRATION
Possible Cause
1) Undercoating or other foreign
material on shaft.
2) Loose U-joint clamp screws.
3) Loose or bent U-joint yoke or
excessive runout.
4) Incorrect driveline angularity.
5) Rear spring center bolt not in
seat.
6) Worn U-joint bearings.
7) Propeller shaft damaged or out
of balance.
8) Broken rear spring.
9) Excessive runout or unbalanced
condition.
10) Excessive drive pinion gear
shaft runout.
11) Excessive axle yoke deflection.
12) Excessive transfer case runout.
1) Loose U-joint clamp screws.
2) Lack of lubrication.
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.
1) Clean exterior of shaft and wash
with solvent.
2) Install new clamps and screws
and tighten to proper torque.
3) Install new yoke.
4) Measure and correct driveline
angles.
5) Loosen spring u-bolts and seat
center bolt.
6) Install new U-joint.
7) Installl new propeller shaft.
8) Install new rear spring.
9) Re-index propeller shaft, test,
and evaluate.
10) Re-index propeller shaft and
evaluate.
11) Inspect and replace yoke if
necessary.
12) Inspect and repair as necessary.
1) Install new clamps and screws
and tighten to proper torque.
2) Replace as U-joints as
necessary.
XJ
Correction