Once the upload is complete, restart the balancer turning it “off” and then back “on” 
using power switch. 
The updated specifications are now ready for use. 
3.11 Motor Drive/Servo-Stop 
The intelligent DC motor drive on the GSP9720JLR is able to position and hold the 
tire assembly in position for weight application, apply different amounts of torque, and 
control the speed and direction of the spindle.  
If Servo-Stop is enabled, when the “Start” button is pushed with the hood in the 
raised position, while weights are showing, the motor will automatically rotate the 
wheel to the next weight plane and hold the assembly in position for weight or mark 
application. 
Servo-Stop can be enabled or disabled from the “Set Up” primary screen. Refer to 
“Servo-Stop,” page 113.
3.12 Spindle-Lok® Feature 
Depressing the foot pedal will lock the spindle. Locking the spindle will stabilize the 
wheel for attaching weights at precise locations if automatic weight positioning is 
disabled, and will allow for tightening and loosening of the wing nut. Do not use the 
Spindle-Lok® as a brake to stop a spinning wheel. 
NOTE:  Depressing the foot pedal will cancel Servo-Stop. 
 CAUTION:  Using the Spindle-Lok® to stop a spinning wheel may result 
in personal injury or damage to the balancer. 
3.13 Balance Primary Screen 
The “Balance” primary screen has a choice of two related views: 
Set Dimensions 
Apply Weights 
GSP9720JLR Wheel Balancer Operation Instructions  Balancing Procedures 
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