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Bearing Block Assemblies
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This repair requires timing and other adjustments and should be done only by an authorized
service technician.
The bearing block assemblies would require replacement if they are damaged or if the sinterbronze bear-
ings that are inside the block slip loose. The sinterbronze bearings are impregnated with oil and in the
center is a y-guide felt that is soaked with oil at the factory when the bearing block is assembled.
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CAUTION!! DO NOT apply grease to the y-rails. Grease will damage the bearings in the bearing
block assemblies.
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CAUTION!! DO NOT attempt to disassemble or rebuild the bearing block assemblies. The in-
ternal bearings are impregnated with lubricant and are easily damaged if improper tools and
procedures are used for assembly.
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CAUTION!! Never allow the internal impregnated sinterbronze bearings to come into contact
with an absorbtive surface. Doing so will damage the bearings.
Replacement Parts Needed:
• left bearing block assembly
• right bearing block assembly
• sewing machine oil
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Note: If you replace one of the bearing block assemblies, it is recommended that you always
replace both of them as a pair.
Replacement Procedures:
Figure 1 - Bearing Block Assemblies
1. Remove the hoop and both hoop arm assemblies (if installed).
2. Color change to Needle #16.
3. Remove the left upper arm front cover.
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