HappyJapan HCH-701-30, Maintenance Manual

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Exchange of needle bar and needle bar spring
3-3-7
5. Pull out needle bar.
At this moment, remove needle bar boss,
needle bar bossB, Needle bar spring H, Pressure foot
block B, Pressure foot spring, Cushion and Plain washer
(M6).
6. While pressing needle bar spring, insert good needle bar
with needle bar boss, needle bar boss B, Pressure foot
block B, Cushion, Plain washer (M6), Needle bar spring H
and Pressure foot spring.
7. Fix needle , needle holder and pressure foot.
8. Adjust needle height.
Please refer to [3-3-6 Adjustment of needle height].
9. Put removed parts back to finish.