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4. Remove both left and right upper arm covers.
5. Loosen the tension on the x-cable at the cable tensioner bracket located on the left upper arm
front section.
6. Remove the cable from the pulleys that are attached to the right bearing block assembly.
7. Remove the button head socket screws mounting the right bearing block assembly to the beam.
Figure 2 - Y-Rail Retaining Screw
8. Loosen the cap head socket screw retaining the y-rail in the upper arm body.
9. Slide the y-rail out towards the back of the machine until you can slide the right bearing block
assembly off, then slide the bearing block off the rail.
10. Wipe the y-rail clean with a rag that is soaked with sewing machine oil.
11. Remove the pulleys from the old bearing block assembly and install them on the replacement
block assembly.
12. Slide the bearing block assembly onto the y-rail with the end with two screw holes on the bottom
edge facing to the front.
13. Reinstall the y-rail back into position in the upper arm body and tighten the cap head retaining
screw to the torque specifications.
14. Apply red loctite (MS 222) to the button head screws and mount the x-beam assembly to the
bearing block assembly. Tighten the screws to the torque specifications.
15. Reinstall the cable onto the pulleys on the right bearing block assembly.
16. Repeat the procedures from step 6 to step 15 above for the left bearing block assembly.
17. Add 10 drops of sewing machine oil to the oiling holes located on the top center of the left and
right bearing block assemblies.
18.
Retention the x-cable using the procedures defined in “X-Cable Tensioning”.
19. Reinstall the left and right upper arm covers.
20. Reinstall the left upper arm front cover.
21. Conduct machine functional tests to verify y-axis movements and make sure there are no further
obstructions.
22. Conduct a registration sew test using “AMRTESTXXX.EXP” test design and verify that there are no
registration issues, especially on the x-axis movements.
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