Parts & Tool Information
Situation: Vibration from Wheels and Tires
A customer may complain of steering vibration or shimmy." Sources of vibration/shimmy can be Radial Force Variation (RFV) in the wheel-tire assemblies and also the positioning/mounting of the wheels on the vehicle.Resolution: Match Mounting and Wheel/Tire Installation Procedures
In case of a customer complaint of vibration/shimmy on vehicles, follow the optimization procedures in this bulletin using a Hunter 9700/9712 balancing machine. The procedures to be followed are:Tire to
wheel match-mounting
The tire is positioned on the wheel so that the low point of the
tire is matched to the high point of the wheel. This procedure is also
referred to as match-mounting. The Hunter 9700/9712 balancing machine
performs this procedure.
Wheel/tire
installation
The wheel/tire assembly is mounted to the vehicle's hub in a manner
that allows the Radial Force high point of the assembly to be
neutralized by taking up the inherent clearance in the wheel-to-hub
mating surface. The Hunter 9700/9712 balancing machine identifies the
high point of the wheel/tire assembly.
Note: Correct two-part wheel weights are available from Wurth
USA (800 987 8487). Part numbers:
1830-217-998.........Clip
0830-217-005.........5g
0830-217-0**........**g (multiples of 5g up to 60g)
Land Rover requires that wheel/tire assemblies be mounted to the Hunter 9700/9712 using the correct centering sleeve announced in Bulletin STEO2-13 and the 5-lug flange plate adaptor previously supplied to Retailers (photo at right). This mounting method provides precise balance with the highest rate of repeatability.
CAUTION : Care must be taken to ensure that the balancing location cone / spindle does not contact any part of the wheel/tire assembly except the illustrated location (image at right) during the balancing procedure. If the cone contacts any other part of the wheel/tire assembly, an incorrect cone has been selected.
Mounting the Centering Sleeve properly in the
wheel opening is vital
to the proper location of the wheel on the balance machine (image at
right).
Land Rover recommends the use of a compression tool, such as the HAW 900, to install wheel weights. This tool prevents both accidental damage to the rim and deformation of the wheel weight clips.
NOTE :Tires are factory "match-mounted" on the wheels by Land Rover at initial assembly. It is important to retain this mounting orientation on vehicles where it is known that the original factory balance is still intact
1. Refer to the Owners Handbook specification and inflate tires to proper "cold" air pressures.
NOTE :Tire heating is REQUIRED. It is extremely vital to the match-mounting process.
2. Drive the vehicle on a 15-20 mile highway-speed road test to ensure that all flat spots are removed and to heat tires to operating temperatures.
3. Lift the vehicle off the ground immediately after the road test to minimize temporary flat spots.
4. If tires are directional" tires, mark for installation in the same location on the vehicle after balancing.
1. If the wheels are known to have non-factory balance or are
equipped with new tires, perform the following:
Remove wheel assembly while tire is still warm.
Measure and record the Radial Force variation.
Perform wheel-to-tire match-mounting if balancing machine indicates
necessity.
Record the amount of the Radial Force variation (lbs.) on the inside of
tire with crayon.
CAUTION :For rim-mounted wheel weights, use only Land Rover
specification two-piece clip-on wheel weights (image below left).
NOTE :Inner edge of compression tool must be placed close to rim.
Outer swivel foot of compression tool must be placed onto shoulder of
tire.
Balance wheel on the Hunter 9700/9712, installing two-piece
weights as follows.
Compress the inflated tire at the bead and the shoulder with
compression tool.
Insert the wheel weight clip between the tire bead and the road wheel
(image below center).
Release the compression tool. Spread the wheel weight clip using the
two-piece Haweka clip tool HAW 900/1.
Slide the weight under the clip (image below right).
Verify that the weight is fully seated.
 |
 |
 |
| Two-piece weight | Inserting compression tool | Insert wheel weight clip |
1. If vehicle is equipped with directional tires, mount
tires in original locations.
NOTE :On vehicles with directional tires
the wheel and tire assemblies can only be optimized at their original
location on the vehicle. Step 2 does NOT apply to directional tires.
2. If vehicle does NOT have directional tires, mount tires in the
following locations:
Lowest value of Radial Force variation on left front of vehicle
Second lowest value of Radial Force variation on right front of vehicle
Third lowest value of Radial Force variation on left rear of vehicle
Highest value of Radial Force variation on right rear of vehicle.
3. Tighten wheel nuts to a snug "finger tight" condition (no wobble evident between the wheel and mounting surface)
4. Rotate each wheel so that the previously marked high point is at the bottom (6 o'clock position) and will contact the floor when the vehicle is lowered.
5. Lower the vehicle partially to the floor so that light-to-moderate load is placed on each of the wheels.
6. Torque the lug nuts of each wheel to 140 Nm (103 lb/ft.)
7. Road test the vehicle.
Steering Vibration
Problems (RR III)
Wheel & Tire
Information (Range Rover III)
Common Problems and Fixes
(Range Rover III).