7-6. Adjusting the needle clearance; 7-7. Adjusting the shuttle race thread guide; 7-8. Rotary hook lubrication amount- Page 99

7. ADJUSTMENT 

BAS-311G, BAS-326G 

92

7-6. Adjusting the needle clearance 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Turn the machine pulley to align the tip of the rotary hook with the center of the needle, and then loosen the set screw (1) 
and turn the eccentric shaft (2) to adjust so that the clearance between the needle and the rotary hook is 0.01 

−

 0.08 mm. 

7-7. Adjusting the shuttle race thread guide 

Install the shuttle race thread guide (1) by pushing it in the direction of the arrow so that the needle groove is aligned with 
the center of the needle plate hole. 

NOTE: 

If the shuttle race thread guide is in the wrong position, thread breakages, soiled thread or tangling of the thread may 
occur. 
The position of the shuttle race thread guide is adjusted at the time of shipment from the factory. It should not be 
changed if possible. 

7-8. Rotary hook lubrication amount 

The optimum position is when the head of the set screw (1) 
is aligned with the edge of the bed. The rotary hook 
lubrication amount can be adjusted within three turns to the 
right from that position. 

•

 If the set screw (1) is turned clockwise, the lubrication 

amount becomes smaller. 

•

 If the set screw (1) is turned counterclockwise, the 

lubrication amount becomes greater. 

0.01 

−

 0.08mm 

3574Q

 0138Q 

4995Q

4996Q

Less oil 

More oil 

Aligned