The runout data will automatically be displayed when the operation is complete. The
inner and outer rim runout first harmonics will be shown as amounts in the upper left-
hand corner of the screen. Radial high spots of runout will be shown as blue
indicators on the rim. Lateral high spots will be shown as orange indicators on the rim
when “Show Lateral High Spots” is selected. The average of the inner and outer
radial first harmonic high spots are taken to locate the average radial first harmonic
rim low spot (matching mark). Refer to “Harmonics & T.I.R. Data/Plots,” page 106.
Rim Runout Measurement (Bare Rim)
To measure bare rim runout, remove the tire from the rim. Mount the bare rim on the
GSP9720JLR. Select “Measure Rim Runout” from the “Balance” primary screen.
Select “Measure Bare Rim.” Loosen the outer Dataset® arm locking screw by turning
it counter-clockwise. Pull out and rotate the rim runout ball on the outer Dataset® arm
to the downward position. Secure the locking screw. Place the outer Dataset® arm
ball against the left bead seat lip as shown below:
OUTER ARM
BUTTON
OUTER DATASET
ARM BALL
LOCKING
SCREW
When outer Dataset® arm ball is in place, press the outer arm button. The motor will
slowly rotate the rim to measure runout. While the wheel is in motion, gently apply a
downward and outward pressure on the outer Dataset® arm ball.
When the screen prompts, place the outer Dataset® arm ball against the right bead
seat lip as shown below:
When the Dataset® arm ball is in place, press the outer arm button. The motor will
slowly rotate the rim to measure runout. While the wheel is in motion, gently apply a
downward and outward pressure on the Dataset® arm ball.
If the data will be used in Forcematching®, scribe a mark with chalk or a marker to
realign the rim to the hub/shaft assembly after the tire is mounted. After mounting the
tire and re-spinning, the runout data of the bare rim may be recalled by pressing
“Recall Last Rim Data” from the “Runout & Road Force” popup screen. Refer to
“Forcematching® Using Previous Bare Rim Measurement,” page 85.
GSP9720JLR Wheel Balancer Operation Instructions Balancing Procedures
65
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