2.8  Filling Grease to Reduction Gear and Replacement 
  The reduction gear is to be replaced by our service engineer.    If it is replaced by the 
customer, we will not guarantee any consequential trouble or accident. 
 
•  The reduction gear should be replaced with a new one only after the controller 
power is turned off with the power supply plug removed.    If the work is done 
while the power is turned on, you may get an electric shock or the robot may 
malfunction, which is very dangerous. 
 
•  Because the reduction gear is disconnected, the mechanical home point shifts 
and proper control cannot be done.    To avoid this, home return operation is 
necessary after replacement of the reduction gear.    For the home return 
procedures, see Section 4. 
 
  2.8.1  Type of Reduction Gear 
  The reduction gears used in this robot are shown below. 
When you place an order for the reduction gear for replacement, specify the robot 
model (TH650A), axis name, type and our drawing number. 
 
Reduction gear 
Axis 1  RV–27C–36–57  S816716 
Axis 2  RV–10C–27  S816717 
Axis 4  VRGF-15B60P-400  S829013 
STE 85306 
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