Yamaha YK-X Series User Manual page 110

CHAPTER 4 Adjustment
Use only YAMAHA genuine bolts or JIS B 1176 hex socket head bolts
(strength class: JIS B 1051 12.9).
M3×12
Bolt
Fig. 4-11 (a)
Counterclockwise Counterclockwise Counterclockwise
Fig. 4-11 (b)
Ball screw
Mark
Clockwise Clockwise Clockwise
4-30
Z-axis lower end damper
Flat surface
Z-axis motor shaft
(located under the flange)
Flange