Launch X-631 Wheel Aligner Maintenance Manual                                        Probe Rod Calibration 
5-3 
 
 
 
●  Check if the linearity of the lateral axle is up to standard: Install 1# and 2# probe rod on the two ends of the 
lateral axle respectively (as shown in the following figure), read the corresponding CCD values from computer test 
program,  and  then  compare  the  values  with  the  corresponding  calibrated  values  in  CHECK  file,  the  difference 
between them are required to be less than 2 percent;           
 
 
In succession, turn the two probe rods by 180 degrees respectively, and read 1# and 2# CCD values, and then 
compare them with the corresponding values from CHECK file (the same as the previous procedure), the difference 
between them are required to be less than 2 percent. If the two procedures above-mentioned are all satisfied, it 
indicates  that  the  linearity  of  this  calibration  frame  is  up  to  standard,  and  can  be  used.  After  installing  the  two 
vertical axles, the calibration frame installation procedures are finished.