C4  Maintenance  6. Joint #2 
 
C Series Maintenance Manual Rev.2  87 
6.3  Joint #2 - Replacing the Timing Belt 
 
Removal: Joint #2 Timing belt 
1.  Follow Removal steps (2) through (4) of C4 Maintenance: 6.1 Joint #2 – Replacing the Motor.   
 
2.  Remove the Arm #1 side cover. 
  For details, refer to C4 Maintenance: 3. Covers. 
 
3.  Loosen the Joint #2 motor unit set screw. 
Hexagon socket head cap bolts: 3-M4×18   
(with a plain washer) 
 
4.  Remove the Joint #2 timing belt. 
Remove the timing belt from the pulley 1 first. 
Then, remove the timing belt from the pulley 2. 
 
This procedure is common in C4-A601** and C4-A901**. 
 
 
Installation: Joint #2 Timing belt 
1.  Place the Joint #2 timing belt to the pulley 1 and the pulley 2 of the Joint #2. 
Place the timing belt to the pulley 2 first.    Then, place the timing belt to the pulley 1. 
 
2.  Secure the Joint #2 motor unit. 
For details, refer to C4 Maintenance: 6.1 Joint #2 – Replacing the Motor, Installation steps (6), (8), and (9). 
   
Maintenance 
Parts 
Timing belt 
Tools 
Hexagonal wrench   
(width across flats: 3 mm) 
1  For M4 hexagon socket head cap bolt