5.1.9 Ball Screw Replacement, Y-Axis – 4000 & 5000
1. Move the y-axis to the front of the machine.
2. Remove the electronic handwheel (or mechanical handwheel) and axis motor cover.
3. Remove the front ball screw bearing and housing.
4. Remove the Y-axis motor and belt.
5. Remove the double nut that holds the pulley and slide the ball screw pulley from the ball screw
along with the key.
6. Remove the bearing cover, locking nut, axis bearings and bearing housing (block). When
removing the bearings, take note to how they are mounted.
7. Now go to the bottom of the column and rear of bed and remove the access cover to the rear
bearing on the Y-axis.
8. Remove the nut, bearing and bushing that is found at the end of the ball screw.
9. Now go to the front of the machine and remove the ball nut from the yoke. Slide the ball screw
toward you to remove. Make sure to disconnect the oil line. Reassemble.
10. Install the Y ball screw to the yoke and install the oil line.
11. Install the axis bearings in the housing and into the ball screw in the same manner as you
removed them. Tighten the lock nut & install the bearing cover.
12. Install the ball screw pulley and key. Lock the pulley with the double nut.
13. Install the axis motor and belt.
14. Install the front bearing and housing.
15. Install the motor bracket cover & electronic handwheel or mechanical handwheel.
Note: See the diagnostic section under mechanical drive train for an explanation on how to align the
ball screw.
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