7-19. Adjusting the backlash of the lower shaft gear; 7-19. Adjusting the backlash of the lower shaft gear ; 7. ADJUSTMENT - Page 110

7. ADJUSTMENT 

BAS-311G, BAS-326G 

103

7-19. Adjusting the backlash of the lower shaft gear 

1.  Gently tilt back the machine head. 
2.  Remove the five screws (1) and three flat screws (2), 

and then remove the oil cover (3). 

3.  Remove the four screws (4) and Y-belt cover (5). 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
4.  Loosen the two set screws (6). 
5.  Place set screw collar R (7) against the edge of the bed so that the pulley can turn easily. 

*  If the pulley cannot turn easily, loosen the set screw (8) and turn the pulley while moving the rock gear (9) back and 

forth. At the position where the pulley moves freely, place set screw collar R (7) against the edge of the bed and 
tighten the set screw (8). 

6.  Turn the rock gear shaft (10) to adjust the play at the end of the driver (11) to 0.05 – 0.15 mm, and tighten the set 

screws (6). 

5157Q 

5256Q

5240Q