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Grabber Stepper Motor Replacement
The grabber stepper motor requires replacement when the grabber assembly fails to function and power
supply failure to the motor has been eliminated as a cause. Before replacing the motor, conduct trouble
shooting procedures to evaluate the failure between the main PCB, grabber harness and the motor.
Replacement Parts Needed:
• Bi-Polar Stepper Motor Subassembly
• One (1) M4x0.7x6mm Flt Pt Socket Set Screw
Replacement Procedure
1. Remove the needlecase access cover.
2. Remove the needlecase cover.
Figure 1 - Grabber Eccentric
3.
Rotate the grabber eccentric with your fingers and remove the set screw in the grabber drive
eccentric.
Figure 2 - Grabber Stepper Motor Mounting Screws
4. Remove the three M4x6mm cap head socket screws and M4 split lock washers that mount the
grabber mounting plate to the needlecase frame.
5. Remove the four M3x4mm cap head socket screws mounting the motor to the grabber mounting
bracket and set them aside for reuse.
6. Mount the grabber mounting bracket to the replacement motor.
7. Apply red loctite (MS222) to the four M3x4mm cap head socket screws. Start the screws loose
and then tighten them to the torque specifications.
8. Align the motor shaft to the grabber drive eccentric and ensure the spindle enters the bore of the
eccentric and does not push against the side of the eccentric.
9. Start three M4x6mm cap head socket screws into the motor bracket mounting it to the needle
case frame, then tighten the screws to the torque specifications.
10. Apply red loctite (MS 222) to a new M4x0.7x6mm set screw and install it into the grabber drive
eccentric and tighten it to the torque specifications.
11. If you do not have any further work on the needlecase assembly, reinstall the needlecase cover
and access cover.
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