Yamaha YK-X Series User Manual page 128

CHAPTER 5 Periodic Inspection
3) Enter the safeguard enclosure and check the following points.
Checkpoint
Manipulator bolts and screws (Only for
major bolts and screws exposed
externally)
Detection areas of the origin sensors of
the X-axis, Y-axis, and R-axis
Controller
Grease lubrication of Z-axis ball screw
and spline
Z-axis ball spline, ball screw
Bolt size
M3 button head bolt
M4 set screw
M3
M4
M5
M6
M8
M10
M12
M14
Use only YAMAHA genuine bolts or JIS B 1176 hex socket head bolts
(strength class: JIS B 1051 12.9).
Check for looseness and tighten if necessary.*1
Clean if it is dirty.
Check for looseness at each terminal and connector on the
panel. (See 4 in Chapter 3.)
Lubricate the Z-axis spline shaft and ball screw nut after
removing the old grease. The specified grease is Alvania
S2 (SHOWA SHELL SEKIYU KK). (See Fig. 5-1.)
Check for backlash. (If any abnormality is found, contact
YAMAHA dealer.)
*1 Bolt tightening torque
Tightening torque (kgfcm)
14
20
20
46
92
156
380
459
1310
2090
5-6
Procedure
Tightening torque (Nm)
1.4
2.0
2.0
4.5
9.0
15.3
37
45.0
128
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