C8 Maintenance    2. General Maintenance 
 
190  C Series Maintenance Manual Rev.2 
2.3.5 Joint #4 Reduction Gear Unit 
 
 
Remove the grease plug from the Joint #4 
grease inlet of the Arm #4. 
 
  Attach the grease nipple to the Joint #4 grease 
inlet. 
 
The grease plug attaching hole located near the 
label with “4”  printed is the Joint #4 grease 
inlet. 
The grease inlet position differs depending on 
the model.   Carefully identify the correct 
position. 
  Inject grease from the grease nipple using   
a grease gun 
Grease: SK-1A 
Grease amount: 2g 
 
  Remove the grease nipple from the Joint #4 
grease inlet. 
 
  Attach the grease plug to the Joint #4 grease 
inlet. 
 
If the grease plug is damaged or deteriorated, 
replace it with a new one.