MAINTENANCE MANUAL
66
STE 85357
8)
Remove the hexagon socket head cap screw (M4 x 12 x 6 pcs.) securing the
ball spline nut, and pull out the ball spline nut downward.
If it is hard to remove the ball spline nut, lightly tap the pulley with a plastic
hammer or similar tool that does not make scratches and then remove the ball
spline nut. If the pulley is pounded with a hammer or forcibly pulled out, Arm 2
may be deformed and, as a result, a new ball screw cannot be mounted
accurately.
9)
Disconnect the axis 4 nut pulley secured to the ball spline nut with the hexagon
socket head cap screw (M4 x 10 x 6 pcs.).
Fig. 2.43 Dismounting ball screw spline nut (THL300, THL400)
10)
Insert the disconnected ball spline nut into the ball screw spline shaft.
A marking for phase adjustment is stamped on both the ball screw spline shaft
and the ball spline nut. Align the two markings when inserting the ball spline
nut. To prevent the nut from slipping off, wind cable ties around near the top
and bottom of the shaft.
Hexagon socket
head cap screws
M4 x 12 x 6 pcs.
Ball spline nut
Axis 4 nut pulley
Hexagon socket
head cap screws
M4 x 10 x 6 pcs.